Quantifying the impact of drought on soil-plant interactions: a seasonal analysis of biotic and abiotic controls of carbon and nutrient dynamics in high-altitudinal grasslands

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• 作者：Zhiyuan Wang (1) (2)
  Lucas C. R. Silva (3)
  Geng Sun (1)
  Peng Luo (1)
  Chengxiang Mou (1) (4)
  William R. Horwath (3)
  
  1. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province ; Chengdu Institute of Biology ; Chinese Academy of Sciences ; No.9 Section 4 ; Renmin Road S ; Chengdu ; Sichuan ; People鈥檚 Republic of China
  2. Institute of Agriculture Environment and Resources ; Yunnan Academy of Agricultural Sciences ; No.2238 Beijing Road ; Kunming ; Yunnan ; People鈥檚 Republic of China
  3. Biogeochemistry and Nutrient Cycling Lab ; University of California ; One Shields Avenue ; Davis ; CA ; 95616-8627 ; USA
  4. Graduate University of Chinese Academy of Sciences ; No.19A Yuquan Road ; Beijing ; People鈥檚 Republic of China
  
• 关键词：Climate change ; Drought stress ; Nutrient limitation ; Soil ; plant interactions ; Tibet
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：389
• 期：1-2
• 页码：59-71
• 全文大小：918 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Background and aims Understanding the impacts of ever more severe and widespread drought events has become a central focus of recent ecological research. Accordingly, the objective of this study is to investigate fundamental mechanisms that control drought effects on climate sensitive ecosystems by regulating soil-plant interactions. Methods Field experiments were conducted in high altitudinal grasslands of the Tibetan Plateau. Based on historical records, we simulated extreme drought events, intercepting water inputs in early (spring), mid (summer), and late (autumn) periods of the plant-growing season (PGS). We measured vegetation responses to changes in soil physical, chemical, and biological properties, examining how the interplay of abiotic and biotic processes regulate the impacts of drought above and below ground. Results Decreasing water input resulted in proportional increases in summer and autumn soil temperature, but reduced soil temperature during the spring drought. As a result, soil microbial biomass and available N and P concentrations remained stable during the early-PGS drought, while enzymatic activity, decomposition of organic materials, and nutrient release increased during the mid- and late-PGS. Concerted changes in microbial and plant activity determined seasonal fluctuations in carbon assimilation, microbial activity and nutrient dynamics, with varying degrees of resistance and resilience to drought stress observed at different PGS periods. Conclusions Significant interactions were observed between plant productivity and microbial activity in response to moisture variability and associated changes in soil temperature, with the largest deleterious drought effects registered during the summer, when competition for limiting resources between plants and microorganisms was strongest.