Danzhou, which lies in western Hainan and where large鄄scale Eucalyptus plantations are present, was chosen as the target study area. We selected 1鄄to鄄5鄄year鄄old short鄄rotation Eucalyptus trees, 20鄄year鄄old Eucalyptus trees and 10鄄year鄄 old Cocos trees with adjacent space and similar natural conditions as our experimental plots. After 3 years of continuous sampling, from 2010 to 2012, in fixed sites, we analyzed the variation of soil moisture content for Eucalyptus forests and its response to plantation ages. The results showed that: (1) Soil moisture content decreased continuously from January to
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