第2代杉木近熟林水文学过程研究

A Study of the Hydrological Process of Secondary-generation Chinese fir Plantation

根据2005年会同定位观测站第3小集水区实测数据,对第2代杉木近熟林进行了水量平衡和蒸发散研究.结果表明:2005年降水量为1077.5 mm,水分输出中,总径流量为191.90 mm,总蒸发散量899.49 mm,水分输出比水分输入多13.89 mm,这部分水量由原来贮存在土壤中的水分提供;与第1代杉木成熟林的水量平衡相比,林冠截留率降低了4.7%,总径流系数降低了2.1%,土壤蓄水多亏损0.1%左右,蒸发散系数由81.20%提高到83.48%.

Based on the data collected from Watershed Ⅱ at Huitong Localized Observation Station in 2005, the waterbalance and evaporation of its secondary-generation Chinese fir plantation were studied. The results show that the income of water from precipitation was 1 077. 5 mm, the total runoff was 191.90 mm and the evaporation was 899.49 mm. Since both the runoff and the evaporation were output, it was 13.89 mm more than the income, and the water deficit had to be provided by soil-molsture. Compared to the waterbalance of the first generation Chinese fir plantation, the crown interception rate decreased by 4. 7%, the total runoff coefficient decreased by 2. 1%, the soil-molsture deficit was only 0. 1% more and the coefficient of evaporation rose to 83.48% from 81.20%.