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Table 2 Multi-group comparison of path coefficients between natural and planted coniferous forests. A non-significant value, highlighted in bold, indicates that the path contribution to the model is equal between forest types

From: Spatial pattern and driving factors of biomass carbon density for natural and planted coniferous forests in mountainous terrain, eastern Loess Plateau of China

Free parameter between-groups was constrainedMLχ2ΔMLχ2P-value
None9.688  
path from LAT to PRCP18.0758.4340.004
path from LAT to ELE45.41135.7230.000
path from COV to BCD9.7260.0380.846
path from PRCP to BCD10.1150.4270.514
path from ELE to BCD13.8164.1270.042
path from LAT to AGE16.8077.1010.008
path from ELE to AGE9.8440.1530.696
path from AGE to COV14.8445.2330.022
path from AGE to BCD9.8540.1660.684
path from PRCP to COV9.7070.0240.876
  1. The first row shows the maximum likelihood χ2 estimates (MLχ2) when all parameters are free. The remaining rows show the result by constraining one parameter at a time. The difference between the fully free model and the rest is given as ΔMLχ2, and the P-value indicates the probability that the constraint of that parameter changes the model. Bonferroni-corrected P-value threshold, 0.05/13 = 0.0038. BCD, biomass carbon density; AGE, stand age; COV, stand coverage; LAT, latitude; ELE, elevation; PRCP, mean annual precipitation