Contrasting responses of soil C-acquiring enzyme activities to soil erosion and deposition

doi:10.1016/j.catena.2020.105047

	Contrasting responses of soil C-acquiring enzyme activities to soil erosion and deposition
	Du, Lanlan 2,3; Wang, Rui 4; Hu, Yaxian 4; Li, Xiaogang 4; Gao, Sheng 4; Wu, Xihui 4; Gao, Xin 4; Yao, Lunguang 1; Guo, Shengli 1,2,3,4
刊名	CATENA
	2021-03-01
卷号	198 页码:9
关键词	Erosional plot Depositional plot Soil CO2 emission Chinese Loess Plateau
ISSN号	0341-8162
DOI	10.1016/j.catena.2020.105047
通讯作者	Guo, Shengli(guoshli@nwafu.edu.cn)
英文摘要	Soil C-acquiring enzymes are good indicators for the biological mechanism of soil nutrients and organic matter cycles. However, they have been used less frequently to assess the ecological stability and soil C cycle in eroding landscapes due to a lack of knowledge of the responses of C-acquiring enzyme activities to soil erosion and deposition. In the present study, a 3-year field simulation experiment was conducted to examine the variations in the activities of C-acquiring enzymes (beta-1,4-xylosidase (beta X), beta-1,4-glucosidase (beta G) and beta-D-cellobiohydrolase (CBH)) from erosion-deposition plots with different slope gradients (5 degrees, 10 degrees and 20 degrees) on the Loess Plateau in China (2016-2018). The activities of beta X, beta G and CBH were higher in the depositional plots than in the erosional plots, and those differences were enlarged with increasing slope gradients. Compared to the 5 degrees-erosional plot, the activities of beta X, beta G and CBH respectively declined by 3.2-4.5%, 14.3-37.5% and 12.7-29.1% in the 10 degrees-and 20 degrees-erosional plots. The beta X, beta G and CBH activities were 2.2-18.1%, 17.3-32.1% and 14.8-86.2% higher in the 10 degrees-and 20 degrees-depositional plots than in the 5 degrees-depositional plot. Moreover, the total soil CO2 emissions from the whole erosion-deposition plots decreased as slopes steepened. The displaced runoff and sediment depleted soil moisture, SOC, clay and microbial biomass in the erosional plots but enhanced these resources in the depositional plots, which can account for the changes in C-acquiring enzyme activities. The spatial distribution of enzyme activities affected soil CO2 emissions in a positive linear function. The sensitive responses of the C-acquiring enzyme activities and the controlling effects of C-acquiring enzyme activities on soil CO2 emissions during erosion and deposition processes, should be properly considered in assessing the biological mechanism for nutrition cycling in regions predominated with fragmented eroding landscapes.
资助项目	National Natural Science Foundation of China[41371279]
WOS关键词	ORGANIC-MATTER ; EXTRACELLULAR ENZYMES ; EXTRACTION METHOD ; WATER EROSION ; CARBON-CYCLE ; NITROGEN ; DECOMPOSITION ; STOICHIOMETRY ; RESPIRATION ; DIVERSITY
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000605337000014
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/136378]
专题	中国科学院地理科学与资源研究所
通讯作者	Guo, Shengli
作者单位	1.Nanyang Normal Univ, Collaborat Innovat Ctr Water Secur Water Source, Reg Midline South North Divers Project Henan Prov, Nanyang 473061, Henan, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Du, Lanlan,Wang, Rui,Hu, Yaxian,et al. Contrasting responses of soil C-acquiring enzyme activities to soil erosion and deposition[J]. CATENA,2021,198:9.
APA	Du, Lanlan.,Wang, Rui.,Hu, Yaxian.,Li, Xiaogang.,Gao, Sheng.,...&Guo, Shengli.(2021).Contrasting responses of soil C-acquiring enzyme activities to soil erosion and deposition.CATENA,198,9.
MLA	Du, Lanlan,et al."Contrasting responses of soil C-acquiring enzyme activities to soil erosion and deposition".CATENA 198(2021):9.