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黄土丘陵区紫花苜蓿生长与土壤水分变化
程积民;万惠娥;王静
Alfalfa growth and its relation with soil water status in loess hilly and gully region
CHENG Jimin,WAN Hui′e,WANG Jing
应用生态学报 . 2005, (03): 435 -438 .