干旱区生态环境知识资源中心(Arid): Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties

Arid

DOI	10.1007/s11368-019-02372-w
	Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties
	Gao, Liqian 1; Sun, Hui 2; Xu, Mingxiang 1; Zhao, Yunge 1
通讯作者	Zhao, Yunge
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2020
卷号	20 期号:1 页码:133-142
英文摘要	Purpose Biological soil crusts (biocrusts) are ubiquitous in arid and semi-arid regions and play many critical roles in soil stabilization and erosion prevention, greatly decreasing soil loss. Although sediments may be completely controlled by well-developed biocrusts, runoff loss is observed. Consequently, it is important to study how biocrusts resist runoff erosion in different developmental stages to evaluate and manage water erosion. Materials and methods In the Loess Plateau Region, we sampled 32 biocrust plots representing eight stages of biocrust development and 5 slope cropland soil plots as bare soil control plots. We then used a rectangular open channel hydraulic flume to test the effects of biocrust development on runoff erosion. Results and discussion As expected, the establishment of biocrusts enhanced soil stability, and accordingly, soil anti-scourability significantly increased with biocrust development. Biocrusts exhibiting more than 36% or 1.22 g dm(-2) of moss coverage or biomass fully protected the soil from runoff erosion. Moreover, soil properties, such as soil organic matter, soil cohesion and soil bulk density, were also important in reducing erosion. The findings indicated that biocrusts inhibited runoff erosion through direct physical protection related to biocrust cover and biomass and through the indirect modification of soil properties. In the early biocrust development stage (when moss cover was less than 36%), cyanobacterial biocrust played a primary role in providing resistance to runoff erosion, with resistance being positively related to cyanobacterial biomass (chlorophyll a) and influenced by soil properties. Conclusions The relationship between soil anti-scourability and moss coverage or biomass can be divided into two stages based on a moss cover or biomass threshold. The capacity of biocrusts to resist runoff erosion was limited when moss cover was below the threshold value. Therefore, the stage corresponding to this level of moss cover should be of concern when estimating, predicting and managing water erosion.
英文关键词	Cyanobacteria Development Loess Plateau Moss Water erosion
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000515824400013
WOS关键词	LOESS PLATEAU REGION ; CRUSTS ; ERODIBILITY ; DETACHMENT ; STABILITY ; ROLES ; COVER ; NEGEV
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315072
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China; 2.North Univ Nationalities, Coll Biol Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China
推荐引用方式 GB/T 7714	Gao, Liqian,Sun, Hui,Xu, Mingxiang,et al. Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties[J]. 西北农林科技大学,2020,20(1):133-142.
APA	Gao, Liqian,Sun, Hui,Xu, Mingxiang,&Zhao, Yunge.(2020).Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties.JOURNAL OF SOILS AND SEDIMENTS,20(1),133-142.
MLA	Gao, Liqian,et al."Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties".JOURNAL OF SOILS AND SEDIMENTS 20.1(2020):133-142.