北京山区防护林适宜林分结构研究  

Suitable stand structure of shelterbelts in Beijing mountainous area

作　　者：余新晓[1] 王雄宾[1] 张晓明[2] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室北京林业大学水土保持学院 [2]中国水利水电科学研究院泥沙研究所

出　　处：《北京林业大学学报》2008年第S2期103-106,共4页Journal of Beijing Forestry University

基　　金：国际科技合作项目(2006DFA01780);国家林业局林业科学技术研究项目(2006-69);“十一五”国家科技支撑计划项目(2006BAD03A02)

摘　　要：根据北京山区野外试验观测资料,分析了郁闭度、层次结构对防护林产沙量的影响。结果表明:油松林和刺槐林的产沙量与其郁闭度关系十分紧密;当郁闭度从0.3增加到0.7时,随着郁闭度的增大油松林和刺槐林地的产沙量一直在减少,当郁闭度超过0.7时,反而略呈上升趋势,北京山区油松林和刺槐林的郁闭度以0.7左右为宜。林地产沙量与林分层次结构之间有密切的线性关系,林中乔灌草各层盖度均大于50%,有良好的枯落层时,防止土壤侵蚀功能最好。According to field experiment data of Beijing mountainous areas,the effects of canopy density and hierarchical structure on sediment production in shelterbelts were analyzed.Results show that the sediment production in Pinus tabulae-formis forest and Robinia pseudoacacia has a quite close relationship with the canopy density.When the canopy density increases from 0.3 to 0.7,the sediment production of P.tabulae-formis forest and Robinia pseudoacacia forest is decreasing all the time.With a canopy density above 0.7,there is an increasing tendency of sediment production.Therefore,the proper canopy density of P.tabulae-formis forest and Robinia pseudoacacia forest in Beijing mountain areas is around 0.7.There is a marked linear relationship between the sediment production and the forest hierarchical structure.When the forest hierarchical structure is tree,shrub and fodder grass,with a coverage above 50% in each layer and with a good litter layer,the function of preventing soil erosion is the best.

关 键 词：郁闭度 层次结构 产沙量 适宜林分结构 

分 类 号：S727.2[农业科学—林木遗传育种]