广西猫儿山毛竹林水源涵养功能研究

Study on Water Conservation Function of Moso Bamboo Forest in Mao'er Mountain,Guangxi

对广西猫儿山毛竹林林冠层、凋落物层及土壤层水源涵养功能进行了研究。结果表明:毛竹林地上部分生物量为59.9 t/hm2,地上各部分最大持水量与生物量成正相关(P<0.01);林冠层截留率平均值为18.9%,截留率随降雨量增大而减少(P<0.01);毛竹林凋落物层蓄积量为11.2 t/hm2,最大持水力为13.8 t/hm2;土壤总孔隙度平均值为59.2%,最大持水量为1184.1 t/hm2,土壤的渗透速度和渗透系数K10自上而下逐渐降低;初渗和稳渗速率平均值分别为5.7 mm/min和0.4 mm/min。该研究为漓江流域毛竹林水源涵养功能量化研究提供科学依据和技术支撑。

The water conservation function of Moso bamboo forest in the storey, litter and soil was studied in Mao＇ er mountain. The results showed that aboveground biomass of P. heterocycla was 59.9 t/hm2, and there was a positive relationship between partial biomass and the maximum water- holding capacity （P 〈 0.01 ）. The mean value of rejection coefficient in the storey was 18.9%, and the canopy rejection coefficient reduced as precipitation increases （P 〈 0.01 ）. The litter accumulation was 11.2 t/hm2 and the maximum water - holding capacity in the litter was 13.8 t/hm2. The mean total porosity of the studied soil was 59.2% and the maximum soil water storage was 1184.1 t/hm2. The infiltration rate and the infiltration coefficient K10 decreased with the depth of soil increasing. The mean initial and steady infiltra- tion rate showed respectively 5.7 mndmin and 0.4 mm/min,. This study provided scientific basis and technical support for quantitative research of water conservation function in Li River area