干旱区生态环境知识资源中心(Arid): Factors controlling the asymmetry of soil moisture and vegetation dynamics in a hilly Mediterranean catchment

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DOI	10.1016/j.jhydrol.2021.126207
	Factors controlling the asymmetry of soil moisture and vegetation dynamics in a hilly Mediterranean catchment
	Garcia-Gamero, V; Pena, A.; Laguna, A. M.; Giraldez, J., V; Vanwalleghem, T.
通讯作者	Garcia-Gamero, V (corresponding author), Univ Cordoba, Dept Agron, Edif Da Vinci,Ctra Madrid Km 396, Cordoba 14071, Spain.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	598
英文摘要	The interaction between hydrology, terrain, and vegetation, is an essential element in understanding complex landscapes, and in forecasting their evolution under climate change. In Mediterranean Europe, few studies have been performed on the interrelation between them. In this study, soil moisture, vegetation, and water table dynamics were measured on opposing hillslopes of a semi-arid, Mediterranean catchment in southern Spain, to quantify the aspect influence on ecohydrological dynamics of an oak-woodland savanna or dehesa. Observations of a network of 32 soil moisture sensors on two opposing hillslopes, a north-facing slope (NFS), and a south-facing one (SFS), detected a similar moisture dynamics, although the influence of the vegetation induces a lagged response where the NFS dries out earlier compared to the SFS. Analysis of successive soil water profiles after storm events suggests that the water moves downwards as an unsaturated preferential flow along the walls of the fractured granite material, with residence times between 16.3 and 36.7 days. Our results show that there is a direct coupling between the hillslope hydrology, the depth of the weathered bedrock, much higher on the NFS, and the vegetation dynamics. Vegetation is much denser on NFS, as LIDAR-derived biomass estimates were 29% higher than on the SFS. The evolution of the normalized difference vegetation index (NDVI), obtained from the Sentinel-2 time series, also shows completely opposing trends with a minimum value at the end of winter for the NFS, whereas the SFS reaches minimum values in summer. A significant correlation between NDVI and soil moisture was found for the SFS (Pearson's R of 0.81). However, this correlation is very poor on the NFS, but a good correlation with water table was found (R = 0.46). This shows how the deep weathering on the NFS allows for an additional water source, contained in the rock moisture and saturated zone, that represents an important source for the vegetation, whereas on the SFS only soil moisture supports the vegetation. These vegetation differences in turn directly impact surface soil moisture, leading to the observed, relatively similar trends on both hillslopes.
英文关键词	Soil moisture Slope aspect Mediterranean environments Shallow aquifer recharge
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000661813200054
WOS关键词	WATER-BALANCE ; CLIMATE ; SYSTEM ; TREE ; TRANSPIRATION ; COVER ; SLOPE ; ROCK
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368657
作者单位	[Garcia-Gamero, V; Giraldez, J., V; Vanwalleghem, T.] Univ Cordoba, Dept Agron, Edif Da Vinci,Ctra Madrid Km 396, Cordoba 14071, Spain; [Pena, A.] Univ Cordoba, Dept Ingn Rural, Edif Da Vinci,Ctra Madrid Km 396, Cordoba 14071, Spain; [Laguna, A. M.] Univ Cordoba, Dept Fis Aplicada, Edif C2,Ctra Madrid Km 396, Cordoba 14071, Spain; [Giraldez, J., V] CSIC, Inst Agr Sostenible, Dept Agron, Avda Menendez Pidal S-N, Cordoba 14004, Spain
推荐引用方式 GB/T 7714	Garcia-Gamero, V,Pena, A.,Laguna, A. M.,et al. Factors controlling the asymmetry of soil moisture and vegetation dynamics in a hilly Mediterranean catchment[J],2021,598.
APA	Garcia-Gamero, V,Pena, A.,Laguna, A. M.,Giraldez, J., V,&Vanwalleghem, T..(2021).Factors controlling the asymmetry of soil moisture and vegetation dynamics in a hilly Mediterranean catchment.JOURNAL OF HYDROLOGY,598.
MLA	Garcia-Gamero, V,et al."Factors controlling the asymmetry of soil moisture and vegetation dynamics in a hilly Mediterranean catchment".JOURNAL OF HYDROLOGY 598(2021).