摘要
三北防护林体系的生态效益主要包括 :(1 )防护林的区域气候效益 ,主要有防护林的防风效益 ,防护林对大气水分和空气温度的调节作用 ;(2 )防护林的土壤改良效益 ,包括防护林的固沙和降低风蚀作用 ,防护林对土壤质地的改良作用 ,防护林对土壤水分平衡的影响等 ;(3 )防护林在提高土地生产力与提高农业生产方面的效益等。文中针对以上问题 。
The eclolgical effects of 3-north (north, northeast and north west of China) windbreak system mainly are:(1)regional climate effect,including wind preventing, air moisture and temperature regulations.(2)Soil improvement effect,mainly including sand fixation,wind erosion reducing,soil structure improvement,and soil moisture regulation.(3)Iand productivity and crop production improvement.Concerning the above aspects,a series of indicators to assess the eclolgical effect of the 3-north windbreak system were introduced and analyzed.
出处
《世界林业研究》
CSCD
北大核心
2000年第2期47-51,共5页
World Forestry Research
