ASSESSING PEDOTRANSFER FUNCTIONS TO ESTIMATE THE SOIL WATER RETENTION

被引:0
|
作者
Ribeiro, Bruno Teixeira [1 ]
da Costa, Adriana Monteiro [2 ]
Silva, Bruno Montoani [1 ]
Franco, Fernando Oliveira [3 ]
Borges, Camila Silva [1 ]
机构
[1] Univ Fed Lavras UFLA, Dept Ciencia Solo, Lavras, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Geog, Inst Geociencias, Belo Horizonte, MG, Brazil
[3] Empresa Pesquisa Agr Minas Gerais, Unidade Oeste, Uberaba, MG, Brazil
来源
BIOSCIENCE JOURNAL | 2018年 / 34卷 / 06期
关键词
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.
引用
收藏
页码:177 / 188
页数:12
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