干旱区生态环境知识资源中心(Arid): Seasonal variations in infiltrability of moss-dominated biocrusts on aeolian sand and loess soil in the Chinese Loess Plateau

Arid

DOI	10.1002/hyp.13484
	Seasonal variations in infiltrability of moss-dominated biocrusts on aeolian sand and loess soil in the Chinese Loess Plateau
	Xiao, Bo 1,2,3; Sun, Fuhai 1,2; Yao, Xiaomeng 1,2; Hu, Kelin 1,2; Kidron, Giora J.4
通讯作者	Xiao, Bo
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2019
卷号	33 期号:18 页码:2449-2463
英文摘要	Biocrust effects on soil infiltration have attracted increasing attention in dryland ecosystems, but their seasonal variations in infiltrability have not yet been well understood. On the Chinese Loess Plateau, soil infiltrability indicated by saturated hydraulic conductivity (K-s) of biocrusts and bare soil, both on aeolian sand and loess soil, was determined by disc infiltrometer in late spring (SPR), midsummer (SUM), and early fall (FAL). Then their correlations with soil biological and physiochemical properties and water repellency index (RI) were analysed. The results showed that the biocrusts significantly decreased K-s both on sand during SPR, SUM, and FAL (by 43%, 66%, and 35%, respectively; P < .05) and on loess (by 42%, 92%, and 10%, respectively; P <.05). As compared with the bare soil, the decreased K-s in the biocrusted surfaces was mostly attributed to the microorganism biomass and also to the increasing content of fine particles and organic matter. Most importantly, both the biocrusts and bare soil exhibited significant (F >= 11.89, P <= .003) seasonal variations in K-s, but their patterns were quite different. Specifically, the K-s of bare soil gradually decreased from SPR to SUM (32% and 42% for sand and loess, respectively) and FAL (29% and 39%); the K-s of biocrusts also decreased from SPR to SUM (59% and 92%) but then increased in FAL (36% and 588%). Whereas the seasonal variations in K-s of the biocrusts were closely correlated with the seasonal variations in RI, the RI values were not high enough to point at hydrophobicity. Instead of that, the seasonal variations of K-s were principally explained by the changes in the crust biomass and possibly by the microbial exopolysaccharides. We conclude that the biocrusts significantly decreased soil infiltrability and exhibited a different seasonal variation pattern, which should be carefully considered in future analyses of hydropedological processes.
英文关键词	biological soil crust disc infiltrometer microbiotic crust saturated hydraulic conductivity soil infiltration soil water repellency
类型	Article
语种	英语
国家	Peoples R China ; Israel
收录类别	SCI-E
WOS记录号	WOS:000478909200006
WOS关键词	BIOLOGICAL SOIL ; ORGANIC-MATTER ; MICROBIOTIC CRUSTS ; NEGEV DESERT ; HYDRAULIC-PROPERTIES ; WATER REPELLENCY ; TEMPORAL VARIATIONS ; SURFACE RUNOFF ; INFILTRATION ; DUNES
WOS类目	Water Resources
WOS研究方向	Water Resources
来源机构	西北农林科技大学 ; 中国农业大学 ; Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216191
作者单位	1.China Agr Univ, Coll Resources & Environm Sci, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China; 2.Minist Agr, Key Lab Arable Land Conservat North China, Beijing, Peoples R China; 3.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shaanxi, Peoples R China; 4.Hebrew Univ Jerusalem, Inst Earth Sci, Jerusalem, Israel
推荐引用方式 GB/T 7714	Xiao, Bo,Sun, Fuhai,Yao, Xiaomeng,et al. Seasonal variations in infiltrability of moss-dominated biocrusts on aeolian sand and loess soil in the Chinese Loess Plateau[J]. 西北农林科技大学, 中国农业大学, Hebrew University of Jerusalem,2019,33(18):2449-2463.
APA	Xiao, Bo,Sun, Fuhai,Yao, Xiaomeng,Hu, Kelin,&Kidron, Giora J..(2019).Seasonal variations in infiltrability of moss-dominated biocrusts on aeolian sand and loess soil in the Chinese Loess Plateau.HYDROLOGICAL PROCESSES,33(18),2449-2463.
MLA	Xiao, Bo,et al."Seasonal variations in infiltrability of moss-dominated biocrusts on aeolian sand and loess soil in the Chinese Loess Plateau".HYDROLOGICAL PROCESSES 33.18(2019):2449-2463.