Dendroclimatic analysis of white pine (Pinus strobus L.) using long-term provenance test sites across eastern North America
© The Author(s). 2018
Received: 6 November 2017
Accepted: 13 February 2018
Published: 13 March 2018
The main objective of this study was to examine the climatic sensitivity of the radial growth response of 13 eastern white pine (Pinus strobus L.) provenances planted at seven test sites throughout the northern part of the species’ native distribution in eastern North America.
The test sites (i.e., Wabeno, Wisconsin, USA; Manistique, Michigan, USA; Pine River, Michigan, USA; Newaygo, Michigan, USA; Turkey Point, Ontario, Canada; Ganaraska, Ontario, Canada; and Orono, Maine, USA) examined in this study were part of a range-wide white pine provenance trial established in the early 1960s in the eastern United States and Canada. Principal components analysis (PCA) was used to examine the main modes of variation [first (PC1) and second (PC2) principal component axes] in the standardized radial growth indices of the provenances at each test site. The year scores for PC1 and PC2 were examined in relation to an array of test site climate variables using multiple regression analysis to examine the commonality of growth response across all provenances to the climate of each test site. Provenance loadings on PC1 and PC2 were correlated with geographic parameters (i.e., latitude, longitude, elevation) and a suite of biophysical parameters associated with provenance origin location.
The amount of variation in radial growth explained by PC1 and PC2 ranged from 43.4% to 89.6%. Dendroclimatic models revealed that white pine radial growth responses to climate were complex and differed among sites. The key dendroclimatic relationships observed included sensitivity to high temperature in winter and summer, cold temperature in the spring and fall (i.e., beginning and end of the growing season), summer moisture stress, potential sensitivity to storm-induced damage in spring and fall, and both positive and negative effects of higher winter snowfall. Separation of the loadings of provenances on principal component axes was mainly associated with temperature-related bioclimatic parameters of provenance origin at 5 of the 7 test sites close to the climate influence of the Great Lakes (i.e., Wabeno, Manistique, Pine River, Newaygo, and Turkey Point). In contrast, differences in radial growth response to climate at the Ganaraska test site, were driven more by precipitation-related bioclimatic parameters of the provenance origin location while radial growth at the easternmost Orono test site was independent of bioclimate at the provenance origin location.
Study results suggest that genetic adaptation to temperature and precipitation regime may significantly influence radial growth performance of white pine populations selected for use in assisted migration programs to better adapt white pine to a future climate.
If fossil fuel intensive energy generation continues to grow at current rates, atmospheric concentrations of carbon dioxide (CO2) and other greenhouse gases will increase dramatically. Continued high rates of emissions over the next century could raise mean annual global surface temperature by 2.5 °C to 6.5 °C by 2100 (IPCC 2007). The resulting projected change in spatial and temporal temperature and precipitation regimes, increased frequency of natural disturbance events, and atmospheric CO2 enrichment is expected to alter the distribution, structure, function, and productivity of northern forests (Mickler et al. 2000; Parmesan and Yohe 2003).
A critical need exists to develop ecologically sustainable forest management approaches that incorporate climate change adaptation to sustain carbon sequestration, fiber production, and other ecological goods and services provided by managed forests (Millar et al. 2007; Alexander and Perschel 2009). The success of such efforts depends in part on knowledge of genetic variation in climatic response of tree species (Rehfeldt et al. 1999; Millar et al. 2007; Wang et al. 2010). Therefore, information generated from long-term provenance tests has substantial potential to improve understanding of tree species responses and adaptability to a rapidly changing climate (Rehfeldt et al. 1999; Wang et al. 2010).
Eastern white pine (Pinus strobus L.) is an ecologically and economically important softwood species that occurs throughout much of eastern North America (Wendel and Smith 1990). White pine was a dominant component of pre-settlement forests of eastern North America that is highly valued for its exceptional wood properties. The effects of large-scale exploitive logging and catastrophic fire in the 18th and 19th centuries, coupled with more recent institutional fire suppression and damage and mortality from white pine blister rust (Cronartium ribicola J.C. Fisch.), white pine weevil (Pissodes strobi (Peck)), and root rot fungi (Armillaria mellea (Vahl) P. Kumm) have dramatically reduced the abundance of white pine on the landscape (Abrams et al. 2000).
Genetic adaptation refers to genetic differences or variation among provenances in the natural range of a tree species that have evolved over several generations and ensure it is in sync with the environmental conditions of its location (White et al. 2007; King et al. 2013; Gray et al. 2016). Examples of genetic adaptation in trees include the link between provenance location and tree growth rate and phenology, i.e., tree provenances from more northern latitudes generally grow more slowly and start growing earlier in spring/stop earlier in fall compared to those from more southern latitudes. White pine typically exhibits significant adaptive genetic variation in response to broad climatic gradients, the product of natural selection and genetic processes (Wright 1970; Genys 1987), and as a result is found as a component of most upland forest types in its range. This variation has resulted in tree species populations that are genetically adapted to local and regional environmental conditions. However, as the climate continues to change, white pine may become increasingly unsynchronized with and maladapted to the prevailing climate, resulting in decreased vigor, productivity, and wood quality. The geographic shifts and reductions in suitable climatic habitat projected by climate change models (McKenney et al. 2007; Iverson et al. 2008; Joyce and Rehfeldt 2013) represent a serious threat to white pine throughout much of eastern North America, especially as changes in climate will also influence other abiotic and biotic stressors (Millar et al. 2007).
A network of provenance test sites established in the early 1960s has provided insight into the adaptive genetic variation of white pine (Wright 1970; Genys 1987; Joyce and Rehfeldt 2013; Zalesny and Headlee 2015). This scientific resource has renewed value as a long-term experiment that can increase understanding of the effect of climate change on white pine tree populations growing outside the climate envelope to which they are naturally adapted (Wang et al. 2006). For example, it is known that southern sources of white pine grow faster but are more susceptible to frost damage when planted farther north (Joyce and Rehfeldt 2013). Combining such knowledge with constantly improving global climate models and climate change scenarios can inform seed deployment decisions to produce nursery stock that is best adapted to a given planting site (Joyce and Rehfeldt 2013; Yang et al. 2015). In addition, such knowledge can guide management of natural regeneration where local provenances are currently well adapted to projected future climate conditions.
Dendrochronological methods can be effectively applied to describe the genetic adaptation of tree provenances to environmental conditions (e.g., Chhin 2010; McClane et al. 2011; Pluess and Weber 2012; King et al. 2013; Eilmann et al. 2014; Chhin 2015) and to examine geographic variation in response to climate (e.g., Chen et al. 2010). In response to seasonal changes in climatic drivers of tree phenology, the annual growth cycle of temperate and boreal tree species in North America alternates between phases of summer growth and winter dormancy (Fritts 1976). Examination of the seasonal periodicity of climatic effects on radial stem growth processes through tree-ring analysis (dendrochronology) provides insight into the seasonal timing of radial growth–climate relationships (Fritts 1976; Chhin et al. 2008) and therefore can be used to quantify genetic adaption of tree provenances to environmental conditions (Chhin 2010; Pluess and Weber 2012; Chhin 2015).
Examine the degree of similarity in climatic sensitivity among the provenances planted at each of the 7 test sites.
Examine the influence of geographic location and bioclimate of provenance origin on radial growth response at each test sites.
Location, longitude, latitude, elevation (meters (m)) and number of trees sampled for the 7 test sites
Range in number of trees sampleda
Pine River, Michigan
Turkey Point, Ontario
Location, longitude, latitude, elevation (meters (m)), and seed source identification numbers for the 13 provenances tested at 7 test sites
Canada seed source #
Canada population #
United States seed source #
Franklin, New York
Lunenburg, Nova Scotia
Two increment cores were collected at breast height (i.e., 1.37 m) from a subset of trees that had a diameter at breast height (dbh) at or near the median value of all living trees measured in a plot. All increment cores used in this study were taken at dbh in the east cardinal direction using a 5-mm diameter borer. The number of living trees per provenance available for sampling (Table 1) differed due to variable tree mortality among test sites. The cores were permanently mounted and sanded using standard dendrochronology procedures to prepare them for radial growth trend analysis (Stokes and Smiley 1996). Scanned images of individual cores were acquired with a flatbed scanner at a resolution of 720 dpi. Cores and scanned images were visually cross-dated. Ring-widths were measured from the scanned images using an image analysis system (WinDENDRO, Regent Instruments, Québec, Canada). Statistical quality control was conducted using COFECHA software to ensure that missing and false rings were accounted for (Holmes 1983; Grissino-Mayer 2001). To remove non-climatic effects, cross-dated ring-width measurements were de-trended using a conservative de-trending approach that included fitting a negative exponential curve, simple linear regression, and a line through the mean with ARSTAN software (Cook 1985). The standardized version of the chronology was retained for each individual core sample to prevent the loss of any radial growth signals associated with provenances at different test sites. The standardized radial growth indices were then averaged for individual trees of each provenance at each test site. Chronology statistics, including mean sensitivity and the inter-series correlation coefficient, were determined for each provenance location at each test site.
Principal components analysis (PCA) was used to examine the main modes of variation in the standardized radial growth indices of individual provenances at each test site (Graumlich 1993; Legendre and Legendre 1998). The PCA was carried out using the Factor Analysis function in Systat (ver. 13.0, released 2009), which also included selection of a Varimax rotation to improve interpretation of the principal component axes. Selected principal component axes explained more variation than expected, based on a broken stick null model (Legendre and Legendre 1998).
Year scores from 1976 to 2009 were used in dendroclimatic analyses to examine shared provenance radial growth responses to test site climate. For test sites in the United States, primary climate data were obtained from PRISM (Daly 2008) and for test sites in Canada were obtained from ClimateNA (Hamann et al. 2013). Climate data included minimum, maximum, and mean monthly temperature and total monthly precipitation. These primary variables were used as the basis to produce a synthetic monthly climatic moisture index (CMI) variable calculated as total monthly precipitation minus a measure of monthly potential evapotranspiration (Hogg 1997). Since tree radial growth may respond more strongly when climatic variables are expressed at a seasonal compared to a monthly scale, monthly climatic variables were converted to seasonal 3-month periods (i.e., quarters) by averaging across months for temperature-related variables and summing across months for precipitation and moisture index variables. Because climatic conditions in the previous year can influence radial growth in the following growing season, the range of monthly and seasonal periods was examined from April of the prior year (t-1) to October of the current year (t) of ring formation.
Dendroclimatic analysis was conducted to examine the relationship between year scores representing the main modes of variation (i.e., the first (PC1) and second (PC2) principal component axes) shared across provenances at each test site with respect to the monthly and seasonal climate at each test site. Dendroclimatic analysis was conducted using a step-wise multiple regression conducted with R statistical analysis software for the period 1976 to 2009 (Venables and Ripley 2002; Chhin et al. 2008; R Core Team 2014). Standardized partial regression coefficients were also calculated to rank the relative importance of the predictor variables in each regression model (Zar 1999).
Bioclimatic parameters (abbreviations) and their definitionsa
1. Annual mean temperature (AMT)
The mean of all monthly mean temperatures.
2. Mean diurnal range (MDR)
The mean of all monthly diurnal temperature ranges which is the difference between the monthly maximum and minimum temperature.
3. Isothermality (ISO)
MDR (parameter 2) divided by ATR (parameter 7)
4. Temperature seasonality (TSCV)
Coefficient of variation of temperature expressed as a percentage.
5. Max temperature of warmest period (TWP)
The highest monthly temperature.
6. Min temperature of coldest period (TCP)
The lowest monthly temperature.
7. Temperature annual range (TAR)
The difference between the TWP (parameter 5) and the TCP (parameter 6).
8. Mean temperature of wettest quarter (TWetQ)
Mean temperature of the wettest quarter.
9. Mean temperature of driest quarter (TDQ)
Mean temperature of the driest quarter.
10. Mean temperature of warmest quarter (TWarmQ)
Mean temperature of the warmest quarter.
11. Mean temperature of coldest quarter (TCQ)
Mean temperature of the coldest quarter.
12. Annual precipitation (AP)
The sum of monthly precipitation within a year.
13. Precipitation of wettest period (PWP)
The highest monthly precipitation.
14. Precipitation of driest period (PDP)
The lowest monthly precipitation.
15. Precipitation seasonality (PSCV)
Coefficient of variation of precipitation monthly precipitation expressed a percentage.
16. Precipitation of wettest quarter (PWetQ)
Total precipitation of the wettest quarter.
17. Precipitation of driest quarter (PDQ)
Total precipitation of the driest quarter.
18. Precipitation of warmest quarter (PWarmQ)
Total precipitation of the warmest quarter.
19. Precipitation of coldest quarter (PCQ)
Total precipitation of the coldest quarter.
Amount of explained variance for the principal component loadings of provenances at each test site on the principal component axes and correlation with geographical variables of provenance origin
Test site location
Explained variance PC1 (%)
Explained variance PC2 (%)
Variables associated with PC1
Variables associated with PC2
Latitude (ρ = −0.70), Elevation (ρ = 0.63)
Latitude (ρ = 0.63), Longitude (ρ = 0.51)
Latitude (ρ = − 0.55)
Pine River, MI
Elevation (ρ = − 0.63)
Elevation (ρ = 0.72)
Distance (ρ = − 0.65)
Latitude (ρ = 0.61)
Turkey Point, ON
Distance (ρ = 0.71), Longitude (ρ = − 0.69)
Longitude (ρ = 0.69), Distance (ρ = − 0.68)
Shared provenance radial growth responses to climate of each test site
Influence of location of provenance origin and bioclimate on radial growth response at each test site
Loadings of each provenance on the first (PC1) and second (PC2) principal component axis for each test site
Provenance origin location
Test site location
Pine River, MI
Turkey Point, ON
(0.17, − 0.08)
(0.71, − 0.14)
Spearman rank correlation coefficients reflecting the sensitivity of the first principal component (PC1) loadings of the provenances at each test site with bioclimatic parameters of provenance origin location
Pine River, MI
Turkey Point, ON
Spearman rank correlation coefficients reflecting the sensitivity of the second principal component (PC2) loadings of the provenances at each test site with bioclimatic parameters of provenance origin location
Pine River, MI
Turkey Point, ON
Natural populations of white pine have been examined in prior dendroclimatic and dendroecological studies in eastern North America (Graumlich 1993; Abrams et al. 2000; Black and Abrams 2005; Kilgore and Telewski 2004; Kipfmueller et al. 2010, Chhin et al. 2013). This study represents the first dendroclimatic assessment of a long-term range-wide provenance study of white pine, which consisted of 7 test sites in the United States and Canada and 13 provenances obtained from across the species’ natural range. The results revealed complex radial growth responses to climatic and geographical variables among and within provenances of white pine.
Shared provenance radial growth responses to climate of each test site
Examination of year scores of the first and second principal component axes provided insight into similarities in climatic sensitivity shared among provenances planted at each of the 7 test sites. The negative relationships between the PC1 and PC2 year scores and temperature variables indicated that radial growth of white pine was likely inhibited by higher temperature, and this was observed at all sites except Wabeno (Figs. 3, 4 and 5). The radial growth response to high temperature also differed in seasonality. That is, a winter seasonal effect was evident at Manistique, Newaygo, and Orono; a spring effect at Ganaraska, and a summer effect at 5 of the 7 sites: Pine River, Newaygo, Turkey Point, Ganaraska, and Orono. From an ecophysiological perspective, high temperature stress can result in respiratory depletion of carbohydrate reserves that might otherwise be used to support radial growth (Fritts 1976; Kozlowski et al. 1991). During the growing season, high temperature stress can also induce water stress by increasing evaporative water demand (Fritts 1976). High temperature has been observed to reduce radial growth of white pine growing in the southern region of the Lower Peninsula of Michigan (Chhin et al. 2013) and in northern Minnesota (Kipfmueller et al. 2010). During the winter, high temperatures can interfere with maintenance of cold hardiness leading to low temperature injury (Havranek and Tranquillini 1995). As well, periodic exposure to brief periods of warm temperatures followed by freeze events can result in leaf tissue injury and reduce the growth of coniferous tree species (Havranek and Tranquillini 1995).
Another common relationship found between white pine radial growth (represented by the PC1 and PC2 year scores) and climate is that cold temperature stress either at the beginning (i.e., spring) and (or) end of the growing season (i.e., autumn) was correlated with reduced radial growth. This relationship was observed at 5 of the 7 sites: Wabeno, Manistique, Pine River, Ganaraska, and Orono. Conversely, the positive growth response to warmer spring and fall temperatures indicated that warmer conditions in the spring and (or) fall at these 5 test sites would favor radial growth by increasing the length of the growing season (Fritts 1976; Kozlowski et al. 1991). The timing of the start of the growing season was found to be a factor affecting radial growth in a population of white pine growing in the northern region of the Lower Peninsula of Michigan (Kilgore and Telewski 2004), as well as Wisconsin and the Upper Peninsula Michigan (Graumlich 1993). In contrast, Chhin et al. (2013) examined a more southern population of white pine in Michigan’s Lower Peninsula and did not observe any radial growth dependency on spring temperatures.
White pine radial growth responses to precipitation and CMI varied with test site location. Generally, the PC1 year scores indicated that provenances of white pine at 4 of the test sites (i.e., Wabeno, Manistique, Pine River, and Turkey Point) had a strong, positive response to winter precipitation and CMI. Positive responses to winter precipitation are usually indicative of increased snowpack that can help insulate the soil and prevent the development of cold soil temperatures causing root injury. Furthermore, higher snowfall accumulation increases ground water recharge during spring snow melt, providing abundant soil moisture to support radial growth early in the growing season (Fritts 1976; Kozlowski et al. 1991). The PC2 year scores generally showed a positive response to summer precipitation at 4 of the 7 test sites: Wabeno, Newaygo, Ganaraska, and Orono. Radial growth was sensitive to summer drought stress at these test sites. Reduced radial growth due to growing season drought has been observed in white pine in other regions of eastern North America, including northern Minnesota (Kipfmueller et al. 2010), the southern region of the Lower Peninsula of Michigan (Chhin et al. 2013), an old growth stand of white pine in Massachusetts (Abrams et al. 2000), and the southern Appalachian region (Vose and Swank 1994).
The dendroclimatic regression models revealed significant negative relationships between white pine radial growth (i.e., PC1 but mainly PC2 year scores) and spring and fall precipitation and (or) CMI at 5 of the 7 test sites: Wabeno, Manistique, Pine River, Ganaraska, and Orono. This relationship may be associated with storm damage to tree crowns resulting from exposure to high wind speeds (Everham and Brokaw 1996; Peterson 2000). Test sites near the Great Lakes region may have experienced more frequent wind storms during spring and fall (Scott and Huff 1996). Damage to tree crowns by windstorms could lead to reduced leaf area and decreased photosynthetic capacity. As well, subsequent carbohydrate allocation to crown repair would occur at the expense of reduced allocation to radial growth. At Wabeno and Turkey Point, the negative radial growth responses to winter precipitation could be the result of mechanical damage to crowns due to heavy winter snowfall. Winter crown damage may reduce growth the following growing season when trees prioritize crown repair at the expense of stem diameter growth (Havranek and Tranquillini 1995).
Influence of location of provenance origin and bioclimate on radial growth response at each test site
Examination of the loadings of the provenances on the first and second principal component axes provided an understanding of the primary geographic and bioclimatic parameters that contributed to the main separation of the individual provenances at each test site (Tables 5, 6 and 7). Separation of the loadings of the white pine provenances on the principle component axes at each site indicated that radial growth was affected by differences in the latitude, longitude, and elevation of provenance origin, depending on test site location. This provides evidence for the existence of genetic variation of radial growth potential among white pine provenances, likely associated with spatial variation in the temperature and precipitation regime across its natural range. These results are consistent with earlier findings for this trial (Wright et al. 1970) and the results of other white pine provenance tests (Genys 1987). In contrast, results from a provenance study of European beech (Fagus sylvatica L.) indicated that variation in radial growth response to temperature of northerly and southerly provenances were similar and primarily under environmental control, with limited differences due to genetic background of the provenances (Eilmann et al. 2014). In another study, high gene flow limited local genetic adaptation resulting in similarities in growth response to climate in both European larch (Larix decidua Mill.) and Norway spruce (Picea abies (L.) Karst.) provenances along an elevational gradient.
Responsiveness of provenance loadings to bioclimatic parameters also varied with test site. Separation of provenance loadings on the PC1 axis was significantly correlated with bioclimatic parameters at 4 of the 7 sites: Manistique, Pine River, Turkey Point, and Ganaraska. Of these 4 sites, temperature-related bioclimatic parameters had the strongest correlation with the PC1 provenance loadings, while a precipitation-related bioclimatic parameter was significant at Ganaraska. Furthermore, Turkey Point had the most bioclimatic parameters correlated with the PC1 provenance loadings. All test sites, except for Orono, had significant correlations among the PC2 provenance loadings. Both Wabeno and Turkey Point had the most bioclimatic parameters associated with the PC2 provenance loadings. Overall, to some degree, bioclimatic parameters were significantly associated with provenance loadings and hence differences in radial growth responses at most of the test sites, except for Orono. Of these 6 test sites, 5 were primarily affected by temperature-related bioclimatic parameters while Ganaraska was driven more by a precipitation-related bioclimatic parameter. This result conforms with the general understanding that temperature is the most important driver of adaptive genetic variation in growth, shoot phenology, survival, and frost hardiness of conifers (Gray et al. 2016). Our results also suggest that at the Orono test site, differences in radial growth were likely not affected by bioclimatic parameters of the provenances, and based on dendroclimatic analysis of the year scores, the provenances had similar responses to climatic conditions. Most dendrochronological studies of genetic variation in tree species have examined multiple provenances at a single test site (e.g., Eillman et al. 2014), but our study is one of only a few that have examined radial growth sensitivity of multiple provenances established at multiple test sites. A combination of both site and provenance related sensitivities of radial growth to climate were reported for lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) in western Canada, with provenances with warm climates grown at warm sites responding mainly to summer dryness, while provenances from cold climates planted at warm site were generally responsive to temperature (McLane et al. 2011).
The information presented in our study could be used to help identify climate adapted provenances of white pine for planting in the northern portion of its natural range. For example, focusing only on the component loadings of PC1 and the two highest observed correlations, our results suggest that the best radial growth in the current climate of Manistique might be achieved by planting white pine provenances with comparatively high precipitation in the driest quarter, and relatively lower temperature during the wettest quarter. As well, the absence of significant correlations for the Orono test site suggests that white pine may be generally well adapted to the maritime climate of this region, regardless of provenance. Clearly, a more detailed, comprehensive assessment of genetic variation in white pine is necessary to make confident provenance selections to support assisted migration efforts to better adapt forests to climate change (Yang et al. 2015). However, our results suggest that broad scale genetic variation in white pine radial growth response does exist across a large portion of its natural range, and this variation is expressed when provenances are planted outside their regional climatic habitat.
The future regional distribution, abundance, and productivity of white pine and white pine forest types under a changing climate have been projected using a variety of modelling approaches and climate change scenarios (McKenney et al. 2007; Joyce and Rehfeldt 2013; Peters et al. 2013; Handler et al. 2014; Iverson et al. 2008, 2017), each having a different structure, limitations, assumptions, and levels of uncertainty (Iverson et al. 2017). Bioclimatic, or species distribution models, have typically shown the area of suitable climatic habitat for white pine to decrease and/or move northward by the end of the century, with larger changes under higher greenhouse gas emissions scenarios, but the degree of change varies with region (McKenney et al. 2007; Joyce and Rehfledt et al. 2013; Iverson et al. 2008, 2017). For example, the future abundance of white pine in three forest regions of the United States was unchanged, or experienced small to large reductions by the end of the century, depending on the forest region and the model used, with projected changes being larger in scenarios where future greenhouse gas emissions remain comparatively high and the climate changes more rapidly (Iverson et al. 2017). In the northern portion of its natural range, white pine may experience modest increases in growth during this century under a slightly warmer climate (Peters et al. 2013; Handler et al. 2014; Yang et al. 2015). Conversely, white pine growing near its warmer range limit, may be poorly adapted to increasing temperatures and suffer significant reductions in growth and survival under climate change (Joyce and Rehfeldt 2013; Yang et al. 2015).
Future climate change presents both challenges and opportunities for management of white pine. The current study indicates potential vulnerabilities of white pine radial growth in the northern portion of its range to higher temperatures, summer moisture stress, and crown damage by high winds and heavy snowfall. Projected future increases in temperature, summer drought stress, and higher frequencies of storm activity (IPCC 2007) in this region will require efforts to both adapt management practices to the future climate and enhance conservation of genetic resources of white pine. On the other hand, the current study suggests that white pine radial growth at some test site locations has been historically limited by cold spring and fall conditions. Since future climatic warming will likely increase the length of the growing season, increased growing season temperature could potentially offset these growth limitations in colder regions of its natural range. These results are consistent with those of Yang et al. (2015) that reported optimal height growth of young white pine occurs at an AMT of about 11 °C, and that white pine in relatively colder locations may benefit, at least initially, from modest climate warming.
Thanks go to N. Eskelin, B. Brown, J. Winters, P. Lu, S. Colombo, K. Finley, K. Minnix, I. Allen, B. Birr, and A. Wiese for assistance with field and laboratory data collection. We are grateful to E. Bauer, Dr. W. Headlee, and two anonymous reviewers for their many helpful comments on earlier versions of this manuscript. The conclusions and opinions in this paper are those of the authors and not the Northeastern States Research Cooperative (NSRC), the US Forest Service, or the USDA.
This study was supported by the Northeastern States Research Cooperative (NSRC) through funding made available by the USDA Forest Service.
RZ, WP, JB designed the field sampling and collected the data; SC analyzed the data; SC lead the manuscript writing with contributions from RZ, WP, and JB. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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