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Watershed spatial heterogeneity of soil saturated hydraulic conductivity as affected by landscape unit in the critical zone

文献类型：期刊论文

作者Liu, Shaozhen1,2,3; Wang, Yunqiang1,2,3; An, Zhisheng1,2,3; Sun, Hui2,4; Zhang, Pingping2,3; Zhao, Yali2,5; Zhou, Zixuan1,2,3; Xu, Lan2,5; Zhou, Jingxiong2,5; Qi, Lijun2
刊名CATENA
出版日期2021-08-01
卷号203页码:13
ISSN号0341-8162
关键词Intensive sampling Spatial variation Topography control Structural equation model The Loess Plateau of China
DOI10.1016/j.catena.2021.105322
通讯作者Wang, Yunqiang(wangyq@ieecas.cn)
英文摘要The spatial heterogeneity and related driving factors of the saturated hydraulic conductivity (K-s) in the Earth's critical zones (CZs) have been documented widely in the literature. However, information regarding the effect of distinct landscape units (i.e., Slope-land, Gully-land, and Tableland) on such heterogeneity at the watershed scale in CZs characterized by complex topographic conditions remains scant. In the current study, we collected undisturbed and disturbed soil samples from the surface soil layer (0-5 cm) at 1195 sampling sites across the ShuangChaGou watershed (0.22 km(2)) in the Chinese Loess Plateau (CLP). According to classical and geostatistical analyses combined with the structural equation model (SEM), the mean K-s followed the sequence Slope-land (0.25 cm.min(-1)) > Gully-land (0.187 cm.min(-1)) > All samples (0.186 cm.min(-1)) > Tableland (0.14 cm.min(-1)) (p < 0.05), with the K-s values exhibiting moderate variations except for the Gully-land (strong variation). The LogK(s) spatial variation characteristics (i.e., the anisotropy ratio, effective range, and C/(C-0 + C)) considering the influence of topography varied among the landscape units and the entire watershed. The SEM identified that soil bulk density, saturated soil water content, silt content, plan curvature, NDVI, and slope gradient were the controlling factors in sequence affecting the K-s variation for All samples (AS). In contrast, factors controlling K-s variations were different under the Tableland, Gully-land, Slope-land, and AS. The magnitudes, spatial variations and controlling factors of the surface K-s were greatly affected by the landscape units. Our study provided a robust assessment of the spatial variation of K-s in CZs involving complicated topographic features, highlighting the utility of dividing distinct landscape units when evaluating the K-s variation. A good understanding of this information is helpful for developing distributed hydrological models and for evaluating water and solute transportation in CZs of the CLP and similar regions around the world.
WOS关键词LOESS PLATEAU ; PEDOTRANSFER FUNCTIONS ; PHYSICAL-PROPERTIES ; SOLUTE TRANSPORT ; VARIABILITY ; SURFACE ; MOISTURE ; SCALE ; PARAMETERS ; VEGETATION
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDB40020203] ; National Natural Science Foundation of China[41971045] ; Natural Science Foundation of Shaanxi province[2020JM-308] ; West Light Foundation of The Chinese Academy of Sciences
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
出版者ELSEVIER
WOS记录号WOS:000654354000021
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi province ; West Light Foundation of The Chinese Academy of Sciences
源URL[http://ir.ieecas.cn/handle/361006/16732]  
专题地球环境研究所_生态环境研究室
第四纪科学与全球变化卓越创新中心
通讯作者Wang, Yunqiang
作者单位1.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shanxi, Peoples R China
3.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
4.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China
5.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Shaozhen,Wang, Yunqiang,An, Zhisheng,et al. Watershed spatial heterogeneity of soil saturated hydraulic conductivity as affected by landscape unit in the critical zone[J]. CATENA,2021,203:13.
APA Liu, Shaozhen.,Wang, Yunqiang.,An, Zhisheng.,Sun, Hui.,Zhang, Pingping.,...&Qi, Lijun.(2021).Watershed spatial heterogeneity of soil saturated hydraulic conductivity as affected by landscape unit in the critical zone.CATENA,203,13.
MLA Liu, Shaozhen,et al."Watershed spatial heterogeneity of soil saturated hydraulic conductivity as affected by landscape unit in the critical zone".CATENA 203(2021):13.

入库方式： OAI收割

来源：地球环境研究所

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