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灌溉对甘肃中部黄土台塬区地面塌陷及生态环境影响研究
成自勇
Soil Sink Caysed by Irrigation and the Influence on Ecological Environment of Loess Platform in Middle Gansu Province
CHENG Zi-yong
中国沙漠 . 2002, (2): 172 -176 .