摘要
对板桥河小流域 12年的定位观测表明 :(1)由于防护林体系的初步建成 ,与“七五”相比 ,“九五”期间小流域平均径流量增加了 11.3% ,输沙模数下降了 6 9.6 % ,最大洪峰径流量减少了 3.7% ;(2 )防护林主要林分“九五”的土壤侵蚀模数比“七五”均有明显的减小 ,其中幼林地的土壤侵蚀量减少了 2 3.8%～ 45 .5 % ;(3)针阔混交林在 10年中 ,树干径流增加了 0 .19% ,林冠截留率增加了 4.8% ,地表径流率减少了 1.15 %。11～ 3月的地下径流量有所增加 ;(4 ) 10年来 ,防护林各林分的土壤肥力和物理性状都得到较好的发展 ,养分元素含量普遍提高 。
By location observing for 12 years in Banqiao small watershed, the results show: (1) Because the protective forest system has been preliminary set up, comparison with 1987~1990s,the runoff increase 11.3% during 1996~1999s,sand transport modulus decrease 69.6%, and the greatest flood peak runoff decrease 3.7% in the small watershed;(2) From 1987～1990 to 1996～1999,the soil erosion modulus of main protective forest stands decrease evidently. The soil erosion of young forest stands have decreased 23.8%～45.5%;(3) From 1989 to 1999, in coniferous and broadleaf mixed stand,the stem flow increase 0.19%, the water interception by canopy increase 4.8%,the runoff of soil surface decrease 1.15%.From November to March,the runoff of under soil is increased;(4)In the last 10 years,soil fertility of the each protective forest stand have been developed,nutrient element is increased,physical character is improved.
出处
《水土保持学报》
CSCD
北大核心
2001年第2期80-83,共4页
Journal of Soil and Water Conservation
基金
"九五"国家科技攻关专题!(编号 :96 -0 0 7-0 4-0 6 )资助项目
