THE ECOLOGICAL AGRICULTURE CONSTRUCTION AND ASSESSMENT IN LIUHE VILLAGE, QINGAN COUNTY, HEILONGJIANG PROVINCE ( I )
ZHANG Ren-Wu, ZHOU Yi, LIU Feng-Zhi, FENG Yu-Cheng, WANG Yu-Kun, ZHANG Sheng
Journal of Ecology and Rural Environment . 1989, (3): 25 -29 .