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Effects of vegetation type on the spatial variation of soil NO3--N  and NH4+-N concentrations in a small watershed.
YAN Jia-liang1,2, FAN Zhi-ping1，3, SUN Xue-kai1, WANG Qiong1, LI Sheng-nan1,2, WANG Ye-hong4
cje . 2012, (08): 2044 -2049 .