干旱区生态环境知识资源中心(Arid): The pattern of soil microbe metabolic limitation was altered by the increased sheep grazing intensity in two contrasting grasslands: Implications for grassland management in semiarid regions

Arid

DOI	10.1002/ldr.4444
	The pattern of soil microbe metabolic limitation was altered by the increased sheep grazing intensity in two contrasting grasslands: Implications for grassland management in semiarid regions
	Zhang, Mei; Song, Riquan; Zhang, Ruixi; An, Xilong; Chu, Guixin
通讯作者	Chu, GX
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2023
卷号	34 期号:1 页码:72-83
英文摘要	Soil extracellular enzyme stoichiometry (EES) and microbial metabolic limitation deeply reflect soil quality. However, knowledge about the impacts of different grazing intensities on microbial metabolic limitation has not been well-documented. Herein, the influences of four sheep grazing intensities (ungrazed, UG; lightly grazed, LG; moderately grazed, MG; and heavily grazed, HG) on microbial metabolic limitation were investigated in typical steppe (14-year grazing) and desert steppe (17-year grazing). The activities of an extracellular enzyme (EEAs) involved in soil C, N, and P transformation were determined by fluorimetric microplate assay. We found that different grazing intensities significantly affected extracellular enzyme activities and EES. Compared to the treatments of UG, LG, and MG, microbial relative C limitation in the HG treatment increased by 30.5-64.7% and 18.9-33.1%, respectively, in typical and desert steppes, indicating that heavily grazing aggravated soil microbial relative C limitation. Moreover, along with grazing intensity, vector angle decreased from 50.3 degrees to 27.6 degrees and from 71.5 degrees to 58.9 degrees in desert steppe and typical steppe. This indicated that the pattern of microbial metabolism limitation shifted from P limitation to N limitation in desert steppe, and heavily grazing significantly aggravated microbial N limitation in desert steppe. In addition, the desert steppe was more pronounced than the typical steppe to grazing intensity increasing. Therefore, heavily grazing aggravated microbial metabolism limitation, deteriorated grassland quality. The outcomes of this study highlight that lightly grazing can be an effective management practice to maintain grassland ecological services in semi-arid areas from the perspective of soil microbial metabolic limitation.
英文关键词	extracellular enzyme stoichiometry grassland microbial metabolism soil quality vector analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000865362800001
WOS关键词	ECOENZYMATIC STOICHIOMETRY ; LOESS PLATEAU ; NUTRIENT LIMITATION ; VEGETATION RESTORATION ; PRIMARY PRODUCTIVITY ; LIVESTOCK EXCLUSION ; NITROGEN DEPOSITION ; ENZYME-ACTIVITIES ; INNER-MONGOLIA ; CARBON
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397717
推荐引用方式 GB/T 7714	Zhang, Mei,Song, Riquan,Zhang, Ruixi,et al. The pattern of soil microbe metabolic limitation was altered by the increased sheep grazing intensity in two contrasting grasslands: Implications for grassland management in semiarid regions[J],2023,34(1):72-83.
APA	Zhang, Mei,Song, Riquan,Zhang, Ruixi,An, Xilong,&Chu, Guixin.(2023).The pattern of soil microbe metabolic limitation was altered by the increased sheep grazing intensity in two contrasting grasslands: Implications for grassland management in semiarid regions.LAND DEGRADATION & DEVELOPMENT,34(1),72-83.
MLA	Zhang, Mei,et al."The pattern of soil microbe metabolic limitation was altered by the increased sheep grazing intensity in two contrasting grasslands: Implications for grassland management in semiarid regions".LAND DEGRADATION & DEVELOPMENT 34.1(2023):72-83.