STUDIES ON RELATIONSHIP BETWEEN WATER SUPPLY AND TREE GROWTH IN A POPLAR PLANTATION.II.ANALYSIS OF THE RELATIONSHIP BETWEEN WATER SUPPLY IN THE FIELD, WATER-CONSUMPTION FOR TRANSPIRATION AND VOLUME INCREMENT AND ESTIMATION OF WATER REQUIRMENT IN Characteristics of photosynthetic productivity and water-consumption for transpiration in Pinus densiflora var. zhangwuensis and Pinus sylvestris var. mongolica