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长期施肥对东北黑土酶活性的影响
王树起;韩晓增;乔云发;王守宇
Effects of long-term fertilization on enzyme activities in black soil of Northeast China.
WANG Shu-qi; HAN Xiao-zeng; QIAO Yun-fa; WANG Shou-yu
应用生态学报 . 2008, (03): 551 -556 .