TY - Chin J Plant Ecol A1 - ZHU Li, GUO Ji-Xun, LU Ping, ZHOU Xiao-Mei T1 - Primary Study on the Soil Urease Activity in Three Main Plant Communities in the Songnen Meadow Y1 - JF - Chinese Journal of Plant Ecology JO - Chin J Plant Ecol SP - 638 EP - 643 VL - 27 IS - 5 UR - https://www.plant-ecology.com N1 - 10.17521/cjpe.2003.0092 ER -