Water Balance of Different Age Pinus tabulaeformis Forests in Taihang Mountain, Shanxi
The seasonal changes in water balance components were simultaneously measured in middle-aged(22 a)and mature(58 a) Pinus tabulaeformis forests in Taihang Mountain by using "space replacing time" method.The results indicated that the total evapotranspiration (406.87-418.49 mm) and total water output (431.07-459.57 mm) did not differ substantially between two forests.However,evapotranspiration and water output components varied with forest ages,Compared with these in the middle-aged forest,the proportion of arbor canopy transpiration,arbor canopy interception,litter interception and surface runoff to precipitation in the mature forest decreased by 6.01％,2.21％,0.81％,and 0.26％,respectively,while the proportion of evapotranspiration and interception of the shrub and grass layers and the soil water outflow increased by 8.80％,3.87％,and 2.94％,respectively.Variation in stand age might be the main factor affecting relative contribution of evapotranspiration and water output components without changing their total amount.In growing season,the soil water content in the mature forest decreased slightly,whereas it increased by small amplitude in middle-aged forest.
国家科技期刊平台
NSTL
万方数据
维普
