Hillslope-scale variability of soil water potential over humid alpine forests: Unexpected high contribution of time-invariant component
文献类型:期刊论文
作者 | Wang, Fei4,5; Wang, Genxu3; Cui, Junfang5; Guo, Li3; Tang, Xiangyu2; Yang, Ruxing4,5; Huang, Kewei1 |
刊名 | JOURNAL OF HYDROLOGY |
出版日期 | 2023-02-01 |
卷号 | 617页码:12 |
ISSN号 | 0022-1694 |
关键词 | Hillslope scale Representative locations Spatial variability Soil water potential Temporal stability |
DOI | 10.1016/j.jhydrol.2022.129036 |
英文摘要 | Soil water potential (SWP) gradients control water and energy fluxes in the Soil - Plant - Atmosphere Contin-uum. Exploring the spatial - temporal variability of SWP at the hillslope scale is an essential step towards developing ecohydrological models. In this study, SWP monitoring was carried out on two contrasting, alpine, humid forested hillslopes (i.e., coniferous and broadleaf forests) at three depths (10, 50, and 100 cm). The effects of static (soil properties and topography) and dynamic (precipitation dynamics and soil wetness conditions) factors on SWP dynamics and variability were investigated based on statistical methods, temporal stability, and variance decomposition analysis. The results showed that the SWP in the soil - root zone (10 and 50 cm depths) in the broadleaf forest exhibited higher variability and lower temporal stability than in the coniferous forest, likely because of the stronger evapotranspiration and more variable soil hydraulic conductivity. The relatively high SWP variability in the deeper soil layer (100 cm depth) of both forested hillslopes was due to the frequent lateral/preferential flow. Furthermore, topographic factors (i.e., distance of hillslope to stream and slope) and soil properties (clay and rock fragment contents) regulated the spatial patterns in SWP and influenced repre-sentative site selection in the coniferous and broadleaf forests, respectively. Decomposition of the spatial vari-ance showed that the time-invariant component was the dominant contributor to the total spatial variance. An exponentially increasing relationship between the time-invariant component and mean SWP and a concave-up parabolic shape between the contribution of the temporal anomalies and mean SWP were observed. Our re-sults provide an improved understanding of the temporal and spatial variability in terms of SWP in forested hillslopes. |
WOS关键词 | MOISTURE SPATIAL VARIABILITY ; TEMPORAL STABILITY ; SPATIOTEMPORAL VARIABILITY ; LOESS PLATEAU ; PATTERNS ; VEGETATION ; DYNAMICS ; TENSION ; NETWORKS ; ABSOLUTE |
资助项目 | Strategic Priority Research Pro- gram of Chinese Academy of Sciences[XDA23090201] ; National Natural Science Foundation of China[41790431] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0903] |
WOS研究方向 | Engineering ; Geology ; Water Resources |
语种 | 英语 |
出版者 | ELSEVIER |
WOS记录号 | WOS:000913804500001 |
资助机构 | Strategic Priority Research Pro- gram of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program |
源URL | [http://ir.imde.ac.cn/handle/131551/57183] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
通讯作者 | Wang, Genxu; Cui, Junfang |
作者单位 | 1.Changjiang Inst Survey Planning Design & Res, Hubei Key Lab Basin Water Secur, Wuhan 430010, Peoples R China 2.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China 3.Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Fei,Wang, Genxu,Cui, Junfang,et al. Hillslope-scale variability of soil water potential over humid alpine forests: Unexpected high contribution of time-invariant component[J]. JOURNAL OF HYDROLOGY,2023,617:12. |
APA | Wang, Fei.,Wang, Genxu.,Cui, Junfang.,Guo, Li.,Tang, Xiangyu.,...&Huang, Kewei.(2023).Hillslope-scale variability of soil water potential over humid alpine forests: Unexpected high contribution of time-invariant component.JOURNAL OF HYDROLOGY,617,12. |
MLA | Wang, Fei,et al."Hillslope-scale variability of soil water potential over humid alpine forests: Unexpected high contribution of time-invariant component".JOURNAL OF HYDROLOGY 617(2023):12. |
入库方式: OAI收割
来源:成都山地灾害与环境研究所
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