Evaluating soil acidification risk and its effects on biodiversity-ecosystem multifunctionality relationships in the drylands of China

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外文摘要：Background:Soil acidification caused by anthropogenic activities may affect soil biochemical cycling,biodiversity,productivity,and multiple ecosystem-related functions in drylands.However,to date,such information is lacking to support this hypothesis.Methods:Based on a transect survey of 78 naturally assembled shrub communities,we calculated acid deposition flux in Northwest China and evaluated its likely ecological effects by testing three alternative hypotheses,namely:niche complementarity,mass ratio,and vegetation quantity hypotheses.Rao's quadratic entropy and community-weighted mean traits were employed to represent the complementary aspect of niche complementarity and mass ratio effects,respectively.Results:We observed that in the past four decades,the concentrations of exchangeable base cations in soil in Northwest China have decreased significantly to the extent of having faced the risk of depletion,whereas changes in the calcium carbonate content and pH of soil were not significant.Acid deposition primarily increased the aboveground biomass and shrub density in shrublands but had no significant effect on shrub richness and ecosystem multifunctionality(EMF),indicating that acid deposition had positive but weak ecological effects on dryland ecosystems.Community weighted mean of functional traits(representing the mass ratio hypothesis)correlated negatively with EMF,whereas both Rao's quadratic entropy(representing the niche complementarity hypothesis)and aboveground biomass(representing the vegetation quantity hypothesis)correlated positively but insignificantly with EMF.These biodiversity-EMF relationships highlight the fragility and instability of drylands relative to forest ecosystems.Conclusions:The findings from this study serve as important reference points to understand the risk of soil acidification in arid regions and its impacts on biodiversity-EMF relationships.

外文关键词：

Soil acidification riskBiodiversityEcosystem multifunctionalityNiche complementarity hypothesisMass ratio hypothesisVegetation quantity hypothesis

作者：

Lan Du、Shengchuan Tian、Nan Zhao、Bin Zhang、Xiaohan Mu、Lisong Tang、Xinjun Zheng、Yan Li

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作者单位：

State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,830011,Xinjiang,China

University of Chinese Academy of Sciences,Beijing,100049,China

Fukang Station of Desert Ecology,Chinese Academy of Sciences,Fukang,831505,Xinjiang,China

State Key Laboratory of Subtropical Silviculture,Zhejiang A and F University,Hangzhou,311300,Zhejiang,China

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基金：

Third Xinjiang Scientific Expedition Program中国科学院战略规划重点项目国家自然科学基金国家自然科学基金

项目编号：

2022xjkk0901XDA20060301024217106842330503

出版年：

2024

DOI：

10.1016/j.fecs.2024.100178

森林生态系统(英文版)

北京林业大学

森林生态系统(英文版)

CSTPCD

影响因子：0.09

ISSN：2095-6355

年,卷(期)：2024.11(2)