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Water 2018, 10(6), 728; https://doi.org/10.3390/w10060728

An Integration Approach for Mapping Field Capacity of China Based on Multi-Source Soil Datasets

College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
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Received: 7 May 2018 / Revised: 25 May 2018 / Accepted: 31 May 2018 / Published: 4 June 2018
(This article belongs to the Section Hydrology)
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Abstract

Field capacity is one of the most important soil hydraulic properties in water cycle, agricultural irrigation, and drought monitoring. It is difficult to obtain the distribution of field capacity on a large scale using manual measurements that are both time-consuming and labor-intensive. In this study, the field capacity ensemble members were established using existing pedotransfer functions (PTFs) and multiple linear regression (MLR) based on three soil datasets and 2388 in situ field capacity measurements in China. After evaluating the accuracy of each ensemble member, an integration approach was proposed for estimating the field capacity distribution and development of a 250 m gridded field capacity dataset in China. The spatial correlation coefficient (R) and root mean square error (RMSE) between the in situ field capacity and ensemble field capacity were 0.73 and 0.048 m3·m−3 in region scale, respectively. The ensemble field capacity shows great consistency with practical distribution of field capacity, and the deviation is revised when compared with field capacity datasets provided by previous researchers. It is a potential product for estimating field capacity in hydrological and agricultural practices on both large and fine scales, especially in ungauged regions. View Full-Text
Keywords: field capacity; multi-source soil datasets; integration approach; pedotransfer functions; digital soil mapping; China field capacity; multi-source soil datasets; integration approach; pedotransfer functions; digital soil mapping; China
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, X.; Lu, G.; Wu, Z.; He, H.; Zhou, J.; Liu, Z. An Integration Approach for Mapping Field Capacity of China Based on Multi-Source Soil Datasets. Water 2018, 10, 728.

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