Towards moss biocrust effects on surface soil water holding capacity: Soil water retention curve analysis and modeling

doi:10.1016/j.geoderma.2021.115120

	Towards moss biocrust effects on surface soil water holding capacity: Soil water retention curve analysis and modeling
	Sun, Fuhai 2; Xiao, Bo 1,2; Li, Shenglong 2; Kidron, Giora J.3
刊名	GEODERMA
	2021-10-01
卷号	399 页码:11
关键词	Biological soil crust Brooks Corey model Loess Plateau of China Log-Normal Distribution model Soil water holding capacity van Genuchten model
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2021.115120
通讯作者	Xiao, Bo(xiaobo@cau.edu.cn)
英文摘要	As ecosystem engineers in drylands, biocrusts possibly generate great influences on surface soil water holding capacity and availability, but these effects have not yet been sufficiently investigated, especially through analyzing and modeling their soil water retention curve (SWRC). On the Loess Plateau of China, the naturally developed moss biocrusts and surface bare soil were sampled in five replicates on loess soil and aeolian sand respectively, and their SWRCs from saturation (soil water potential = 0 hPa) to dry (soil water potential = 15,000 hPa) were measured with a sandbox (low water potential range) in combination with a pressure plate (high water potential range). The measured SWRCs were compared to the van Genuchten (VG), Brooks and Corey (BC), and Log-Normal Distribution (LND) models, and the model with best performance was adopted to further determine the effects of biocrusts on surface soil water holding capacity and water availability through comparing the differences in soil water content (theta) at specific water potentials between the biocrusts and uncrusted soil. Our results showed that (i) the biocrusts always had higher. as compared with the bare soil across the whole water potential range, and the increasing effects of the biocrusts was much stronger on aeolian sand (165%) in comparison to that on loess soil (15%). (ii) As compared with the bare soil, the saturated water content, field capacity, wilting point, and available water content of the aeolian sand increased by 52%, 256% (0.192 vs. 0.054 cm(3) cm(-3)), 65%, and 1000% by the biocrusts, respectively; while that of the loess soil increased by 28%, 9% (0.240 vs.0.220 cm(3) cm(-3)), 27%, and 8% by the biocrusts, respectively. (iii) The increased water holding capacity of the biocrusts was possibly attributed to their higher percentage (18% vs. 16%) of microscopic pores (0.3-5 mu m) on the loess soil and their increasing (16% vs. 1%) microscopic pores and decreasing (18% vs. 50%) medium pores (30-75 mu m) on the aeolian sand. (iv) The VG and LND models performed better (R-2 > 0.98, RMSE <= 0.019 cm(3) cm(-3), RE <= 7.4%) than the BC model in simulating the SWRCs of the biocrusts and bare soil, and their fitting errors were mostly distributed in the high (-500 to -1000 hPa) and low (<-5000 hPa) water potential ranges. As indicated by SWRCs, we conclude that biocrusts greatly increase surface soil water holding capacity and water availability, leading in turn to a positive feedback mechanism of the biocrusted layer, which may affect surface hydropedological process (e.g., infiltration and evaporation) in drylands.
资助项目	National Natural Science Foundation of China[42077010] ; Light of West China Program of the Chinese Academy of Sciences[2019]
WOS关键词	WESTERN NEGEV DESERT ; ORGANIC-MATTER ; TENGGER DESERT ; LOESS PLATEAU ; MICROBIOTIC CRUSTS ; SAND DUNES ; HYDRAULIC CONDUCTIVITY ; CHINA GRAIN ; MOISTURE ; CARBON
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000656902300002
资助机构	National Natural Science Foundation of China ; Light of West China Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/164068]
专题	中国科学院地理科学与资源研究所
通讯作者	Xiao, Bo
作者单位	1.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 2.China Agr Univ, Coll Land Sci & Technol, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China 3.Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel
推荐引用方式 GB/T 7714	Sun, Fuhai,Xiao, Bo,Li, Shenglong,et al. Towards moss biocrust effects on surface soil water holding capacity: Soil water retention curve analysis and modeling[J]. GEODERMA,2021,399:11.
APA	Sun, Fuhai,Xiao, Bo,Li, Shenglong,&Kidron, Giora J..(2021).Towards moss biocrust effects on surface soil water holding capacity: Soil water retention curve analysis and modeling.GEODERMA,399,11.
MLA	Sun, Fuhai,et al."Towards moss biocrust effects on surface soil water holding capacity: Soil water retention curve analysis and modeling".GEODERMA 399(2021):11.