干旱区生态环境知识资源中心(Arid): Effects of subsurface flow on dunefields: Doubling the amount of soil moisture and substantially increasing the biomass of annual plants

Arid

DOI	10.1016/j.catena.2023.106933
	Effects of subsurface flow on dunefields: Doubling the amount of soil moisture and substantially increasing the biomass of annual plants
	Kidron, Giora J.; Grishkan, Isabella
通讯作者	Kidron, GJ
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	223
英文摘要	Plants in deserts exhibit heterogeneous distribution, which may stem from water redistribution following runoff. However, heterogeneous plant distribution is also common in dunefields regardless of runoff. In the Hallamish dune field in the hyper-arid Negev Desert, dense vegetation belts are noted in loci where an abrupt change in slope angles of uncrusted slopes (interface, IF) occurs, attributed to subsurface flow (SSF). While SSF was pre-viously noted in dunefields, quantification of SSF is problematic, especially in arid regions where precipitation is low, evaporation is high, and the amount of SSF is not sufficiently large to facilitate direct measurement (in water volume). Here indirect measurements of SSF are reported based on near weekly measurements of available water content (AWC) during 2012/13, 2013/14 and 2015/16 at five slope positions along two dune catenas and the adjacent interdunes: flat semi-stable top (TOPs), flat crusted interdune (IDc), semi-stable (NFs) and crusted (NFc) north-facing slope, and IF. In addition, the hydrological rain and monthly surface stability were also measured, and additionally plant characteristics (cover, number of species, density, and biomass) were used as indicators for AWC. Higher AWC characterized the uncrusted slope positions (especially at IF) in comparison with crusted slope positions of similar slope angles. Although receiving the lowest amount of rain, AWC at IF was -2-fold higher than at most other slope positions, resulting in - 3-to 5-fold higher cover and biomass, serving therefore as 'islands of fertility'. As verified by the Generalized Linear Regression Model, plant performance was mainly dictated by AWC and to a lesser degree by surface stability. Our findings may have broader implications for water redistribution in other dunefields, where a unique distribution of water has at times been attributed to factors such as the effect of biocrusts on infiltration rather than to SSF.
英文关键词	Available water content Biocrust Runoff Species composition Negev Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000923092000001
WOS关键词	MOSS-DOMINATED BIOCRUSTS ; WESTERN NEGEV-DESERT ; BADAIN JARAN DESERT ; SAND DUNES ; TENGGER-DESERT ; WATER CONTENT ; SEASONAL-VARIATIONS ; MICROBIOTIC CRUSTS ; USE EFFICIENCY ; VEGETATION
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395673
推荐引用方式 GB/T 7714	Kidron, Giora J.,Grishkan, Isabella. Effects of subsurface flow on dunefields: Doubling the amount of soil moisture and substantially increasing the biomass of annual plants[J],2023,223.
APA	Kidron, Giora J.,&Grishkan, Isabella.(2023).Effects of subsurface flow on dunefields: Doubling the amount of soil moisture and substantially increasing the biomass of annual plants.CATENA,223.
MLA	Kidron, Giora J.,et al."Effects of subsurface flow on dunefields: Doubling the amount of soil moisture and substantially increasing the biomass of annual plants".CATENA 223(2023).