Soil-vegetation relationships in Mediterranean forests after fire

Forest Ecosystems

Table 1 Characteristics of the study sites

	Cabrera	Gátova	Teleno	Cortes
Fire alarm date	August 21st, 2017	June 28th, 2017	August 19th, 2012	June 28th, 2012
Wildfire size (km²)	99.39	14.14	118.91	297.52
^a Burn severity (dNBR)	424	406	695	588
^b Fire frequency (fires decade^− 1)	0.16	0.14	0.16	0.17
Sampling date (year)	2018, 2019 (1–2 after fire)	2018, 2019 (1–2 after fire)	2015, 2016 (3–4 after fire)	2015, 2016 (3–4 after fire)
Elevation (m)	838–1960	290–815	836–1493	120–942
^c Precipitation (mm)	650–1000	350–600	600–800	400–600
^c Temperature (°C)	5–11	14–16	8–11	13–17
^d Soil pH	5.39	8.33	4.63	8.14
^e Total organic C (mg C·g⁻¹ soil)	51.89	66.14	52.24	36.74
^f Total N (mg N·g^− 1 soil)	4.04	2.87	2.07	2.87
^g Available P (μg P·g⁻¹ soil)	17.89	25.74	7.14	10.51
Vegetation cover (%)	42.88	24.07	52.79	48.40

^a Burn severity calculated through the dNBR spectral index using Landsat imagery (see Fernández-García et al. 2018). ^b The period 1990–2020 (30 years) was used for the calculation of fire frequency in the study sites. ^c Mean annual precipitation and temperature obtained from Ninyerola et al. (2005). ^d pH determined by a suspension of soil:deionized water (1:2.5, w/v). ^e Total organic C calculated with the dry combustion method (Dumas 1831). ^f Total N calculated with the Kjeldahl method (Bremner and Mulvaney 1982). ^g Available P calculated with the Olsen et al. (1954) method