气候变化领域集成服务门户(CCPortal): Changes in soil oxidase activity induced by microbial life history strategies mediate the soil heterotrophic respiration response to drought and nitrogen enrichment

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DOI	10.3389/fmicb.2024.1375300
	Changes in soil oxidase activity induced by microbial life history strategies mediate the soil heterotrophic respiration response to drought and nitrogen enrichment
	Zhuang, Weirong; Li, Yong; Kang, Xiaoming; Yan, Liang; Zhang, Xiaodong; Yan, Zhongqing; Zhang, Kerou; Yang, Ao; Niu, Yuechuan; Yu, Xiaoshun; Wang, Huan; An, Miaomiao; Che, Rongxiao
发表日期	2024
EISSN	1664-302X
起始页码	15
卷号	15
英文摘要	Drought and nitrogen deposition are two major climate challenges, which can change the soil microbial community composition and ecological strategy and affect soil heterotrophic respiration (Rh). However, the combined effects of microbial community composition, microbial life strategies, and extracellular enzymes on the dynamics of Rh under drought and nitrogen deposition conditions remain unclear. Here, we experimented with an alpine swamp meadow to simulate drought (50% reduction in precipitation) and multilevel addition of nitrogen to determine the interactive effects of microbial community composition, microbial life strategy, and extracellular enzymes on Rh. The results showed that drought significantly reduced the seasonal mean Rh by 40.07%, and increased the Rh to soil respiration ratio by 22.04%. Drought significantly altered microbial community composition. The ratio of K- to r-selected bacteria (BK:r) and fungi (FK:r) increased by 20 and 91.43%, respectively. Drought increased hydrolase activities but decreased oxidase activities. However, adding N had no significant effect on microbial community composition, BK:r, FK:r, extracellular enzymes, or Rh. A structural equation model showed that the effects of drought and adding nitrogen via microbial community composition, microbial life strategy, and extracellular enzymes explained 84% of the variation in Rh. Oxidase activities decreased with BK:r, but increased with FK:r. Our findings show that drought decreased Rh primarily by inhibiting oxidase activities, which is induced by bacterial shifts from the r-strategy to the K-strategy. Our results highlight that the indirect regulation of drought on the carbon cycle through the dynamic of bacterial and fungal life history strategy should be considered for a better understanding of how terrestrial ecosystems respond to future climate change.
英文关键词	Qinghai-Tibet plateau; drought; N deposition; microbial community composition; microbial life history strategy; extracellular enzyme activity; heterotrophic respiration
语种	英语
WOS研究方向	Microbiology
WOS类目	Microbiology
WOS记录号	WOS:001193113600001
来源期刊	FRONTIERS IN MICROBIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/310028
作者单位	Yunnan University; Yunnan University; Chinese Academy of Forestry; Institute of Wetland Research, CAF; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zhuang, Weirong,Li, Yong,Kang, Xiaoming,et al. Changes in soil oxidase activity induced by microbial life history strategies mediate the soil heterotrophic respiration response to drought and nitrogen enrichment[J],2024,15.
APA	Zhuang, Weirong.,Li, Yong.,Kang, Xiaoming.,Yan, Liang.,Zhang, Xiaodong.,...&Che, Rongxiao.(2024).Changes in soil oxidase activity induced by microbial life history strategies mediate the soil heterotrophic respiration response to drought and nitrogen enrichment.FRONTIERS IN MICROBIOLOGY,15.
MLA	Zhuang, Weirong,et al."Changes in soil oxidase activity induced by microbial life history strategies mediate the soil heterotrophic respiration response to drought and nitrogen enrichment".FRONTIERS IN MICROBIOLOGY 15(2024).