Variations of soil organic carbon of cropland topsoil in mountain area of northern Guangdong over 25 Years
WEN Ya, DENG Nanrong, LIU Xiaonan, CHENG Jiong, WEI Jianbin
Ecology and Environment . 2011, (9): 1247 -1252 .  DOI: 10.16258/j.cnki.1674-5906(2011)08-09-1247-06

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