Soil-water retention;
Principal component analysis;
Soil moisture;
FIELD-CAPACITY;
AVAILABILITY;
D O I:
暂无
中图分类号:
S [农业科学];
学科分类号:
09 ;
摘要:
Considering the importance of soil water retention for agricultural and environmental purposes, the objective of this study was to assess three pedotransfer functions (PTFs) used to estimate the soil moisture at field capacity (FC) based on soil attributes easily determined. A collection of 17 soils from the Cerrado and Pantanal biomes, including surface and subsurface horizons, was used. PTF-1 considers clay, organic matter, coarse sand, and microporosity; PTF-2 clay, total sand, and organic matter; and PTF-3 only microporosity. The estimated FC values were correlated to soil moisture values measured at different soil water potentials (0, 6, 10, 33, 100, 300, and 1500 kPa) to verify which potential corresponded to estimated FC. The data were subjected to regression analysis and Mann-Whitney rank-sum test to compare predicted and measured values and to principal component analysis (PCA). The analysis of the full dataset indicated that there was a strong correlation (R 0.84-0.91; R-2 0.71-0.82; RMSE 0.07-0.09) between estimated FC and soil water retention measured at potentials of 10 kPa and 33 kPa. FC estimated by PTF-3 correlated better with water holding capacity at 6 kPa. When the PTFs were reapplied to homogeneous soil groups (identified by PCA analysis), the correlation between predicted and measured FC was decreased.
机构:
China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R ChinaChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Xu, Xu
Li, Huawei
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机构:
Henan Tech Coll Construct, Dept Engn Management, Zhengzhou, Peoples R ChinaChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Li, Huawei
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h-index:
机构:
Sun, Chen
Ramos, Tiago B.
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机构:
Univ Lisbon, Inst Super Tecn, MARETEC, Lisbon, PortugalChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Ramos, Tiago B.
Darouich, Hanaa
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机构:
Univ Lisbon, Inst Super Agron, Ctr Invest Agron Alimentos Ambiente & Paisagem LE, Lisbon, PortugalChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Darouich, Hanaa
Xiong, Yunwu
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机构:
China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R ChinaChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Xiong, Yunwu
Qu, Zhongyi
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机构:
Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot, Peoples R ChinaChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
Qu, Zhongyi
Huang, Guanhua
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机构:
China Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R ChinaChina Agr Univ, Chinese Israeli Int Ctr Res & Training Agr, Beijing 100083, Peoples R China
机构:
Fac Sci Tunis, Dept Geol, UR Pedol UR 10 02 04, Tunis 2092, TunisiaIRD, UMR Eco&Sols, Montpellier SupAgro, Cirad,Inra, F-34060 Montpellier 1, France
Brahim, N.
Bernoux, M.
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IRD, UMR Eco&Sols, Montpellier SupAgro, Cirad,Inra, F-34060 Montpellier 1, FranceIRD, UMR Eco&Sols, Montpellier SupAgro, Cirad,Inra, F-34060 Montpellier 1, France
Bernoux, M.
Gallali, T.
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机构:
Fac Sci Tunis, Dept Geol, UR Pedol UR 10 02 04, Tunis 2092, TunisiaIRD, UMR Eco&Sols, Montpellier SupAgro, Cirad,Inra, F-34060 Montpellier 1, France