Freeze-thaw cycles effects on humic substances in typical soils in northeast China
WANG Taiming, WANG Yeyao, XIANG Bao, HU Yu, WANG Jinsheng
Ecology and Environment . 2010, (12): 2870 -2874 .  DOI: 10.16258/j.cnki.1674-5906(2010)12-2870-05