干旱区生态环境知识资源中心(Arid): Surface roughness response of biocrust-covered soil to mimicked sheep trampling in the Mu Us sandy Land, northern China

Arid

DOI	10.1016/j.geoderma.2019.114146
	Surface roughness response of biocrust-covered soil to mimicked sheep trampling in the Mu Us sandy Land, northern China
	Wu, Yong-Sheng 1,2; Li, Xin-Rong1 ; Hasi-Eerdun 3; Yin, Rui-Ping 2; Liu, Tie-Jun 2
通讯作者	Wu, Yong-Sheng
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2020
卷号	363
英文摘要	Surface roughness plays an important regulatory role in the interactions and feedback between the soil surface and atmospheric systems. However, information regarding the response of surface roughness to trampling disturbances caused by sheep grazing is limited, especially in sandy soils covered by biocrust. This study investigated the covariations in the roughness, coverage and shear strength of cyanobacterial crust (CC), algaelichen mixed crust (LC) and moss crust (MC) on both the semi-fixed and fixed dunes at the southern edge of the Mu Us Sandy Land, northern China, under various trampling intensities using field studies and mimicked sheep trampling disturbances. The results showed that the surface roughness of semi-fixed and fixed dunes decreased after an initial increase with increasing trampling intensity, and the surface roughness of the fixed dunes was higher than that of the semi-fixed dunes. In addition, with the increasing trampling intensity, the maximum surface roughness (R-max) and its corresponding trampling intensity of the biocrust-covered soils at different development stages followed the order of CC, LC, and MC. The grazing intensity (G) corresponding to R-max values in both the semi-fixed and fixed dunes at different development stages of biocrust was 9.6 to 14.4 and 11.1 to 14.4 animal unit day/ha, respectively. The biocrust coverage and shear strength decreased exponentially with increasing trampling intensity and significantly affected the sensitivity of surface roughness to changes in trampling strength. Moderate grazing (grazing intensity less than G) was beneficial for increasing the surface roughness of biocrust-covered sandy land. Increased surface roughness has positive and negative impacts on the ecological and hydrological functions of biocrust-covered soil. To minimize the negative effects of moderate grazing on surface soil, the dune fixation degree, biocrust development level, trampling time and interannual precipitation variability should be considered. This study highlighted the role of grazing management in enhancing the surface roughness and associated ecosystem functions of semiarid regions similar to the Mu Us Sandy Land.
英文关键词	Surface roughness Biocrust cover Shear strength Moderate grazing Surface soil structure Ecological and hydrological function
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000515198500020
WOS关键词	MICROBIOTIC CRUSTS ; NEGEV DESERT ; SEMIARID WOODLAND ; TENGGER DESERT ; ORGANIC-CARBON ; RUNOFF ; DISTURBANCE ; DIVERSITY ; MICROTOPOGRAPHY ; IMPACT
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314581
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Shapotou Desert Res & Expt Stn, Lanzhou 730000, Peoples R China; 2.China Inst Water Resources & Hydropower Res, Inst Water Resources Pastoral Area, Hohhot 010020, Peoples R China; 3.Beijing Normal Univ, Coll Nat Resources, Fac Geog Sci, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Wu, Yong-Sheng,Li, Xin-Rong,Hasi-Eerdun,et al. Surface roughness response of biocrust-covered soil to mimicked sheep trampling in the Mu Us sandy Land, northern China[J]. 北京师范大学,2020,363.
APA	Wu, Yong-Sheng,Li, Xin-Rong,Hasi-Eerdun,Yin, Rui-Ping,&Liu, Tie-Jun.(2020).Surface roughness response of biocrust-covered soil to mimicked sheep trampling in the Mu Us sandy Land, northern China.GEODERMA,363.
MLA	Wu, Yong-Sheng,et al."Surface roughness response of biocrust-covered soil to mimicked sheep trampling in the Mu Us sandy Land, northern China".GEODERMA 363(2020).