中国科学院机构知识库网格系统: How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?

How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?

文献类型：期刊论文


作者	Suo, Lizhu 6; Hu, Wei 3; Huang, Mingbin 5,6; Zhang, Yongkun1,5 ; Huang, MB (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China.; Wu, Lianhai 4; Duan, Liangxia 6
刊名	GEODERMA
出版日期	2018
卷号	314 期号:01 页码:85-94
关键词	Time Stability Analysis Mean Relative Difference Transect Loess Plateau
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2017.11.013
文献子类	Article
英文摘要	Soil water content (SWC) measurements for deep soil profiles involve large and expensive expenditures of time and labor. However, understanding of soil water dynamics for deep soil profiles is very important for soil and water resource management and hydrological modeling. This study was aimed at (1) testing whether the mean SWC for the deep profile of a hillslope could be well estimated using the SWC measurements only made at a limited number of time stable locations (TSLs), which were identified from the SWC measurements of the shallow profile (i.e., within 0-100 cm) and (2) subsequently determining the optimal depth of the shallow profile and the optimal number of TSLs using the relative bias to the mean (RBM) SWC and the corrected Alcaike information criterion (AICc). SWC in the 0-300 cm profile was measured at 40 locations along a 243 m long transect on a hillslope where is located in the semiarid region of the Chinese Loess Plateau with a mean annual precipitation (MAP) of 437 mm. A total of 46 SWC measurements made over three growing seasons at each location were divided into the calibration and validation periods. The same method was repeated on the other two hillslopes in the semiarid and semi-humid regions with the MAP of 505 and 580 mm, respectively, for further assessing the effect of soil moisture conditions on the optimal number of TSLs and the optimal depth of the shallow profile. Results indicated that there were significantly correlations between the spatial patterns of SWC in the shallow soil profiles (0-10, 0-20, ... , 0-100 cm) and that in the 0-300 cm deep soil profile (p < 0.01), and the mean SWC in the deep profile on the hillslope could be well estimated using the SWC measurements only at several TSLs identified from the SWC measurements in the shallow soil profile (within 0-100 cm depth). Moreover, the optimal number of TSLs and the optimal depth of the shallow profile varied with soil moisture conditions. In the semiarid region, the optimal depth of the shallow profile was 0-40 cm and the optimal number of TSLs varied from 2 to 3; in the semi-humid region, the optimal depth of the shallow profile was 0-30 cm and the optimal number of TSLs was 3. The RBM values between the predicted and measured mean SWCs in the 0-300 cm deep profile during the calibration and validation periods were in the range of 1.6 to 4.0% on three hillslopes, which are regarded as the acceptable prediction accuracy in the hydrology community. The proposed approach could greatly reduce the expenditures of time and cost in monitoring the mean SWC for the deep profile at various spatial scales and could be applied well to the regions with similar hydrological and climatic conditions.
学科主题	Soil Science
出版地	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
会议日期	无
语种	英语
WOS记录号	WOS:000424178400010
出版者	ELSEVIER SCIENCE BV
源URL	[http://ir.iswc.ac.cn/handle/361005/7833]
专题	水保所科研产出--SCI_2018--SCI
通讯作者	Huang, MB (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China.
作者单位	1.University of Chinese Academy of Sciences, Beijing 100049, China d New Zealand Institute for Plant & Food Research Limited, Private B 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.New Zealand Institute for Plant & Food Research Limited, Private Bag 4704, Christchurch 8140, New Zealand 4.Rothamsted Res, Sustainable Agr Sci, Okehampton, Devon EX20 2SB, England 5.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Yangling 712100, China 6.Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
推荐引用方式 GB/T 7714	Suo, Lizhu,Hu, Wei,Huang, Mingbin,et al. How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?[J]. GEODERMA,2018,314(01):85-94.
APA	Suo, Lizhu.,Hu, Wei.,Huang, Mingbin.,Zhang, Yongkun.,Huang, MB .,...&Duan, Liangxia.(2018).How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?.GEODERMA,314(01),85-94.
MLA	Suo, Lizhu,et al."How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?".GEODERMA 314.01(2018):85-94.

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How shallow and how many points of measurements are sufficient to estimate the deep profile mean soil water content of a hillslope in the Loess Plateau?

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