Study on Water Conservation Function of Platycladus orientalis Plantation
DUAN Jie et al (Key laboratory for silviculture and conservation of the ministry of education College of Forestry,Beijing Forestry University,Beijing 100083)
Ecological forest of Beijing was all-important for improving air quality,conserving water and soil water conservation and so on. The ability of water conservation of Platycladus orientalis plantation in Beijing mountain area was researched and divided into 3 site types:sunny slope and thin soil,sunny slope and thick soil and shady slope and thick soil. Two levels of soil and litter were analyzed. The results showed that soil bulk density of the sunny slope and thin soil was the lowest but the permeability and porosity (total porosity and non-capillary porosity),was the highest than other site type,the average values were 1.267 g/cm3,3.5 mm/min,52.350% and 13.766%; water-holding capacity of litter level of the 3 site types was 37.67,92.31,nd 56.08 t/hm2. Finally,the order of water conservation of these 3 site types was sunny slope and thin soil,sunny slope and thick soil and shady slope and thick soil and the totally water-holding capacity of the two levels was 1 084.66 ,1 027.91 and 1 005.38 t/hm2.