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干旱强度对土壤碳原始化及其在重新湿后温度敏感性的影响

Rui Zhang¹, Rong Li¹, Jialiang Kuang¹

¹School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, People's Republic of China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, Guangdong 510006, People's Republic of China.

The Science of the total environment

|November 8, 2023

概括

干旱的强度和温度显著影响土壤有机碳的分解,影响土壤碳循环. 了解这些原始化效应 (PE) 对于预测土壤对气候变化的反应至关重要.

科学领域:

土壤科学土壤科学
环境微生物学环境微生物学
气候变化生态学生态学

背景情况:

全球气候变化改变了土壤的热量和湿度条件,影响了微生物过程和土壤碳 (C) 循环.
土壤的碳循环和短暂的环境条件之间的关系,特别是干旱重新湿事件和温度,仍然不完全理解.
缺乏关于干旱和温度如何影响土壤有机碳 (SOC) 分解速度的定量数据,以应对外部C输入 (原始效应,PE).

研究的目的:

在不同干旱强度和化温度下,在土壤重新湿时量化葡萄糖诱导的原始化效应 (PE).
评估干旱强度对PEs的影响大小及其温度灵敏度.
阐明这些反应背后的微生物机制.

主要方法:

在两个干旱强度 (33%和20%的水容量,WHC) 下,在三个温度 (15,25,35°C) 下进行了土壤化,随后进行了重新化.
葡萄糖诱导的原始效应 (PE) 在潜伏21天后得到量化.
响应比率 (lnRR) 和Q10被用于分析干旱和温度对PEs的影响,以及微生物社区分析.

主要成果:

葡萄糖添加诱导了积极的PE,使SOC分解率增加了29.7-72.7%.
干旱强度在较低的温度 (15,25°C) 中对PEs产生了积极的影响,但在较高的温度 (35°C) 中则产生了负面影响.
在中度干旱 (33%WHC) 的情况下,PEs显示出显著的温度敏感性 (Q10=1.65),但在严重干旱 (20%WHC) 的情况下没有显著的温度敏感性.
干旱,温度和葡萄糖的添加改变了占主导地位的细菌和真菌类的丰富性.
在干旱期间高温下减少微生物矿需求与PE有关.

结论:

干旱的强度显著调节了原始化效应及其温度灵敏度,这对气候变化下的土壤碳循环有影响.
微生物社区的转移在调解观察到的原始化效应方面发挥着作用.
了解这些相互作用对于预测环境变化中的土壤有机碳动态至关重要.

关键词:

细菌和真菌组成细菌和真菌组成伯奇效应是一种"伯奇效应".微生物驱动的矿是微生物驱动的矿.引入效应的初始化效应 Q((10) 这是一个很大的问题.响应比率是响应比率.

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