干旱区生态环境知识资源中心(Arid): Enzyme stoichiometry reveals microbial nitrogen limitation in stony soils

Arid

DOI	10.1016/j.scitotenv.2024.174124
	Enzyme stoichiometry reveals microbial nitrogen limitation in stony soils
	Huang, Long; Bao, Weikai; Kuzyakov, Yakov; Hu, Hui; Zhang, Hanyue; Li, Fanglan
通讯作者	Li, FL
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	946
英文摘要	Resource limitation for soil microorganisms is the crucial factor in nutrient cycling and vegetation development, which are especially important in arid climate. Given that rock fragments strongly impact hydrologic and geochemical processes in arid areas, we hypothesized that microbial resource (C and N) limitation will increase along the rock fragment content (RFC) gradient. We conducted a field experiment in Minjiang river arid valleys with four RFC content (0 %, 25 %, 50 %, and 75 %, V V-1) and four vegetation types (Artemisia vestita, Bauhinia brachycarpa, Sophora davidii, and the soil without plants). Activities of C (beta-1,4-glucosidase, BG), N (beta-1,4-N-acetyl-glucosaminidase, NAG; L-leucine aminopeptidase, LAP), and P (acid phosphatase, ACP) acquiring enzymes were investigated to assess the limitations by C, N or P. In unplanted soil, the C acquiring enzyme activity decreased by 43 %, but N acquiring enzyme activity increased by 72 % in 75 % RFC than those in rock-free soils (0 % RFC). Increasing RFC reduced C:N and C:P enzymatic ratios, as well as vector length and vector angle (< 45 degrees). Plants increased the activities of C and N acquiring enzymes in soils, as well as C:P and N:P enzyme activities, as well as vector length (by 5.6 %-25 %), but decreased vector angle (by 13 %-21 %). Enzyme stoichiometry was dependent on biotic and abiotic factors, such as soil water content, soil C:N, and total content of phospholipid fatty acids, reflecting microbial biomass content. Increased RFC shifted enzymatic stoichiometry toward lower C but stronger N limitation for microorganisms. Vegetation increased microbial C and N limitation, and impacted the enzymatic activities and stoichiometry depending on shrub functional groups. Consequently, the direct effects of vegetation, nutrient availability and microbial biomass content, as well as indirect effects of soil properties collectively increased microbial resource limitations along the RFC gradient.
英文关键词	Rock fragment content Vegetation type Enzyme activities and stoichiometry Microbial resource limitations Arid ecosystems
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001262948700001
WOS关键词	ROCK FRAGMENTS ; ECOENZYMATIC STOICHIOMETRY ; LOESS PLATEAU ; COMMUNITY COMPOSITION ; NUTRIENT ACQUISITION ; MYCORRHIZAL FUNGI ; FATTY-ACIDS ; FINE EARTH ; BIOMASS ; TRANSECT
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405519
推荐引用方式 GB/T 7714	Huang, Long,Bao, Weikai,Kuzyakov, Yakov,et al. Enzyme stoichiometry reveals microbial nitrogen limitation in stony soils[J],2024,946.
APA	Huang, Long,Bao, Weikai,Kuzyakov, Yakov,Hu, Hui,Zhang, Hanyue,&Li, Fanglan.(2024).Enzyme stoichiometry reveals microbial nitrogen limitation in stony soils.SCIENCE OF THE TOTAL ENVIRONMENT,946.
MLA	Huang, Long,et al."Enzyme stoichiometry reveals microbial nitrogen limitation in stony soils".SCIENCE OF THE TOTAL ENVIRONMENT 946(2024).