RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (02): 234-238.doi: 10.11870/cjlyzyyhj201602008

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ESTIMATION OF FIELD CAPACITY FOR VARIOUS LAND USES IN A RED SOIL REGION IN CENTRAL SUBTROPICAL CHINA

ZOU Gang-hua1, LI Yong1, PENG Pei-qin2   

  1. 1. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    2. College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
  • Received:2015-06-15 Revised:2015-08-26 Online:2016-02-20
  • Supported by:
    Innovation Team Foundation of the Chinese Academy of Sciences, (No. KZCX2-YW-T07);the 100 Talents Program of the Chinese Academy of Sciences

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Abstract: The parameter of field capacity is an important index to reflect soil water-retaining ability, as well as being crucial for farmland irrigation, water management and hydrological models. However, since the direct measurement for field capacity is tedious and time-resuming, it is necessary to require a fast and accurate approach to derive it. Hence, fifty undisturbed 1-m depth soil profile samples were collected from paddy fields and dry lands in a subtropical basin in Hunan province. And based on soil basic properties, the estimation of field capacity was derived by multiple stepwise linear regression, the results showed that: (1) field capacity was mainly influenced by soil bulk density and soil organic carbon for paddy soil, but mainly by textures for dry lands; (2) the models for field capacity in paddy field performed the best, with adjusted coefficient of determination of 0.79, and relative bad for dry lands. The conclusion indicated that the assessment of field capacity was greatly affected by land uses, and it was convenient to obtain field capacity with pedotransfer function.

Key words: field capacity, pedotransfer function, land uses, hydrological model, parametric estimation

CLC Number: 

  • S152.7
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