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

作　　者：Jingling Zhang Guigang Lin Qiong Zhao De‑Hui Zeng 

机构地区：[1]CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China [2]Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Resources and Environmental Engineering,Anhui University,Hefei 230601,China

出　　处：《Ecological Processes》2022年第1期512-524,共13页生态过程（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Numbers 31870603,41877341);the Youth Innovation Promotion Association CAS(Grant Number 2019200)。

摘　　要：Background:Drought can exert a profound influence on soil nutrient availability,and understanding whether and how tree species adapt to this change is a critical priority for predicting the consequence of climate change on forest structure and function.The objective of this study was to examine the adaptability of Mongolian pine(Pinus sylvestris var.mongolica)to drought‑induced changes in soil nutrient availability from the perspective of root functions.Methods:We conducted a 7‑year precipitation manipulation experiment with three levels of throughfall reduction(0%,30%,and 50%)to simulate different drought intensities.We measured soil physicochemical properties and fineroot nutrient concentrations and biomass,and calculated the stoichiometric homeostatic regulation coefficient(1/H)of fine roots.Results:Drought reduced soil organic carbon(C),nitrogen(N),phosphorous(P)and inorganic N concentrations,as well as ratios of total N to total P,and available N to available P in the 0–20 cm soil layer.In contrast,drought had no significant effect on fine‑root N and P concentrations,and fine‑root biomass in the 0–40 cm soil layer.Fine roots displayed high homeostatic regulation coefficients of N(with 1/H values of 0.19 and 0)and P(with 1/H values of 0.33 and 0)concentrations in 0–20 and 20–40 cm soil layers,respectively.Conclusions:Our results indicate that drought leads to soil nutrient deficiency and the decoupling between N and P cycling,and provide evidence that Mongolian pine has high adaptability to drought‑induced decrease in soil nutrient availability by maintaining great fine‑root biomass to ensure sufficient nutrient uptake.

关 键 词：C:N:P stoichiometry Fine‑root biomass Stoichiometric homeostasis Throughfall reduction 

分 类 号：S15[农业科学—土壤学]