Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.2136/sssaj2018.03.0126 |
Estimating Saturated Hydraulic Conductivity along a South-North Transect in the Loess Plateau of China | |
Yang, Yang1; Jia, Xiaoxu2,3,4; Wendroth, Ole5; Liu, Baoyuan3 | |
通讯作者 | Yang, Yang |
来源期刊 | SOIL SCIENCE SOCIETY OF AMERICA JOURNAL |
ISSN | 0361-5995 |
EISSN | 1435-0661 |
出版年 | 2018 |
卷号 | 82期号:5页码:1033-1045 |
英文摘要 | A precise description of saturated hydraulic conductivity (K-s) and its spatial variability is required for modeling soil and water transport in the vadose zone. Nevertheless, the direct measurement of K-s is expensive and laborious especially for large domains crossing hundreds of kilometers. The objective was to estimate K-s from easily accessible soil properties and environmental factors using pedotransfer functions (PTFs) and state-space analysis. Along an 860-km south-north transect in the Loess Plateau of China, soil cores for K-s measurements were collected at depths of 0 to 10, 10 to 20, and 20 to 40 cm at 10-km intervals from 15 Apr. to 15 May 2013. Multiple linear regression (MLR) and artificial neural network (ANN) were used to derive PTFs for K s estimation. Based on the eight factors of bulk density, soil organic carbon, sand content, clay content, mean annual precipitation and temperature, slope gradient and elevation, the state-space analysis appeared to outperform the PTFs in calibrating K-s over the entire transect. The adjusted coefficients of determination (Radj(2)) for the state-space models were all greater than 0.9, whereas the corresponding Radj(2) were much lower for the MLR- and ANN-type PTFs (ranging from 0.398 to 0.880). However, the state-space approach is quite scale-sensitive, and overfitting occurred when it was cross-validated with a leave-one-out procedure. It performed almost perfectly in calibration as implied in the Radj(2) of similar to 1 but rather poorly in validation with Radj(2) typically >0.4. The ANN method exhibited the best K-s estimations at all depths. Both wavelet coherency and state-space modeling quantified the spatial correlations of K-s with the eight factors investigated and manifested consistent results, that is, bulk density, clay content, and topography were the primary properties controlling K-s distribution. These findings are critical for hydrological modeling and irrigation management in the Loess Plateau of China and possibly other arid and semi-arid regions. |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000446667000004 |
WOS关键词 | SOIL PHYSICAL-PROPERTIES ; STATE-SPACE APPROACH ; PARTICLE-SIZE DISTRIBUTION ; SPATIAL VARIABILITY ; WATER-RETENTION ; PEDOTRANSFER FUNCTIONS ; ORGANIC-CARBON ; BULK-DENSITY ; WAVELET TRANSFORM ; SCALE |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
来源机构 | 中国科学院地理科学与资源研究所 ; 北京师范大学 ; 西北农林科技大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/213226 |
作者单位 | 1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; 3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China; 5.Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA |
推荐引用方式 GB/T 7714 | Yang, Yang,Jia, Xiaoxu,Wendroth, Ole,et al. Estimating Saturated Hydraulic Conductivity along a South-North Transect in the Loess Plateau of China[J]. 中国科学院地理科学与资源研究所, 北京师范大学, 西北农林科技大学,2018,82(5):1033-1045. |
APA | Yang, Yang,Jia, Xiaoxu,Wendroth, Ole,&Liu, Baoyuan.(2018).Estimating Saturated Hydraulic Conductivity along a South-North Transect in the Loess Plateau of China.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,82(5),1033-1045. |
MLA | Yang, Yang,et al."Estimating Saturated Hydraulic Conductivity along a South-North Transect in the Loess Plateau of China".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 82.5(2018):1033-1045. |
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