High adaptability of Pinus sylvestris var. mongolica to drought-induced soil nutrient deficiency

Ecological Processes

Table 1 Two-way ANOVA test (F values) for the effects of drought treatment (D), soil depth (SD), and their interaction (D × SD) on soil water content and nutrient availability, fine-root nutrients and biomass

Variables	D	SD	D × SD
Soil water content	15.68***	12.72**	0.45
NH₄⁺-N	0.39	54.83***	0.90
NO₃⁻-N	7.97**	24.09***	3.39*
Inorganic N	4.79*	40.50***	2.71
Olsen-P	1.99	97.49***	1.02
Available N:P	3.82*	10.84**	0.77
Soil organic C	11.86***	112.90***	3.02
Soil total N	10.81***	56.79***	3.15
Soil total P	10.12***	68.59***	3.67*
Soil C:N	2.42	3.71	1.37
Soil C:P	1.80	47.70***	0.34
Soil N:P	4.56*	15.59***	1.26
Root C	0.54	6.11*	0.34
Root N	1.14	124.14***	1.65
Root P	0.90	40.62***	0.65
Root C:N	4.23*	95.26***	4.43*
Root C:P	1.21	17.19***	0.71
Root N:P	0.12	0.06	0.05
Dead fine-root biomass	0.34	72.22***	2.30
Live fine-root biomass	3.00	55.87***	0.90
Total fine-root biomass	1.44	81.64***	0.23