Potential water use extrapolation and planting density calculation of Chinese pine and black locust stands in north Beijing mountain area
Based on the sapwood growth models, potential sap flux densityand scaling up theory of single tree to stand, the midterm and short term potential water use predictions of Chinese pine and black locust stands in different planting densities have been made. The short term and midterm predictions, which are called temporal scaling up, have also been accomplished by the establishment of sapwood growth models. It is predicted that, the present Chinese pine stand (21 years) has a relative large potential of water use than black locust stand (9 years); After 10 years (Chinese pine will be 31 years and black locust 19 years), they will get close. Under same age class (black locust is 19 years, Chinese pine stand is 21 years), black locust stand water use is much higher than Chinese pine stand. If the planting density exceed 1500 plants/hm2, the Chinese pine stands (under the hydrological conditions of the experimental area) will suffer from water stress in 20 to 30 years and black locust stands in 10 to 20 years. The higher the density, the earlier the water stress will occur. The appropriate plant density is 750 plants/hm2 or a little greater when taking the survival rate in consideration.
国家科技期刊平台
NSTL
万方数据
