High microbial diversity stabilizes the responses of soil organic carbon decomposition to warming in the subsoil on the Tibetan Plateau

底土 表土 土壤碳 环境科学 生物多样性 生态系统 高度(三角形) 微生物种群生物学 土壤水分 生态学 土壤科学 高原(数学) 环境化学 化学 生物 细菌 数学 数学分析 遗传学 几何学
作者
Xu Meng,Xiaoliang Li,Thomas W. Kuyper,Minggang Xu,Xin Li,Junling Zhang
出处
期刊:Global Change Biology [Wiley]
卷期号:27 (10): 2061-2075 被引量:74
标识
DOI:10.1111/gcb.15553
摘要

Abstract Soil microbes are directly involved in soil organic carbon (SOC) decomposition, yet the importance of microbial biodiversity in regulating the temperature sensitivity of SOC decomposition remains elusive, particularly in alpine regions where climate change is predicted to strongly affect SOC dynamics and ecosystem stability. Here we collected topsoil and subsoil samples along an elevational gradient on the southeastern Tibetan Plateau to explore the temperature sensitivity ( Q 10 ) of SOC decomposition in relation to changes in microbial communities. Specifically, we tested whether the decomposition of SOC would be more sensitive to warming when microbial diversity is low. The estimated Q 10 value ranged from 1.28 to 1.68, and 1.80 to 2.10 in the topsoil and subsoil, respectively. The highest Q 10 value was observed at the lowest altitude of forests in the topsoil, and at the highest altitude of alpine meadow in the subsoil. Variations in Q 10 were closely related to changes in microbial properties. In the topsoil the ratio of gram‐positive to gram‐negative bacteria (G+:G−) was the predominant factor associated with the altitudinal variations in Q 10 . In the subsoil, SOC decomposition showed more resilience to warming when the diversity of soil bacteria (both whole community and major groups) and fungi was higher. Our results partly support the positive biodiversity‐ecosystem stability hypothesis. Structural equation modeling further indicates that variations in Q 10 in the subsoil were directly related to changes in microbial diversity and community composition, which were affected by soil pH. Collectively our results provide compelling evidence that microbial biodiversity plays an important role in stabilizing SOC decomposition in the subsoil of alpine montane ecosystems. Conservation of belowground biodiversity is therefore of great importance in maintaining the stability of ecosystem processes under climate change in high‐elevation regions of the Tibetan Plateau.
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