Wang Xiaodong, Li Yong, Hao Yanbin, Kang Enze, Han Jinfeng, Zhang Xiaodong, Li Meng, Zhang Kerou, Yan Liang, Yang Ao, Niu Yuechuan, Kang Xiaoming, Yan Zhongqing
Wetland Research Center, Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing, China, 100091, China; Beijing Key Laboratory of Wetland Services and Restoration, Beijing, 100091, China; Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba, 624500, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
J Environ Manage. 2024 Nov;370:122778. doi: 10.1016/j.jenvman.2024.122778. Epub 2024 Oct 11.
Global warming has changed carbon cycling in terrestrial ecosystems, but it remains unclear how climate warming affects soil heterotrophic respiration (R). We conducted a field experiment in the Zoige alpine peatland to investigate the mechanism of how short-term warming affects R by examining the relationships between plant biomass, soil properties, soil microbial diversity, and functional groups and R. Our results showed that warming increased R after one growing season of warming. However, warming barely changed the bacterial functional groups involved in the carbon cycle predicted by the functional annotation analysis. According to the Mantel test, NO was found to be the primary determinant for bacterial and fungal communities. The results of the Structural Equation Model (SEM) indicate that soil temperature and fungal diversity jointly modulate R, suggesting that short-term warming may not affect R by altering the structural and functional composition of microorganisms, which provides new insight into the mechanisms of the effects of warming on R in terrestrial ecosystems.
全球变暖已经改变了陆地生态系统中的碳循环，但气候变暖如何影响土壤异养呼吸（R）仍不清楚。我们在若尔盖高寒泥炭地进行了一项田间试验，通过研究植物生物量、土壤性质、土壤微生物多样性和功能群与R之间的关系，来探究短期变暖影响R的机制。我们的结果表明，经过一个生长季的变暖处理后，变暖增加了R。然而，变暖几乎没有改变功能注释分析预测的参与碳循环的细菌功能群。根据Mantel检验，发现NO是细菌和真菌群落的主要决定因素。结构方程模型（SEM）的结果表明，土壤温度和真菌多样性共同调节R，这表明短期变暖可能不会通过改变微生物的结构和功能组成来影响R，这为陆地生态系统中变暖对R的影响机制提供了新的见解。
