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STUDY ON THE TECHNIQUE EFFECTS OF WATER-SAVING AND INFILTRATING ROOTS IRRIGATION OF FRUIT TREE IN PEASANTS′ COURTYARD IN ARID AND SEMI-ARID LOESS PLATEAU Biological characteristics and nutrients of the photoperiod-sensitive Sorghum×Sudangrass varieties in the arid land of east Gansu SPECIES-CLIMATE RELATIONSHIPS OF 10 DESERT PLANT SPECIES AND THEIR ESTIMATED POTENTIAL DISTRIBUTION RANGE IN THE ARID LANDS OF NORTHWESTERN CHINA ECOLOGICAL REGIONALIZATION OF ARID LANDS IN NORTHWESTERN CHINA The primary estimation of water demand by the eco environment in Xinjiang Maximum Dust Retention of Main Greening Trees in Arid Land Oasis Cities, Northwest China Age Structure and Growth of Degraded Populus euphratica Floodplain Forests in NW China and Perspectives for Their Recovery Physical Property and Yearly Moving Pattern of Soil Water on the Arid Wheat Land of Hilly Region in Jinnan