榆林沙区低效防风固沙林更新改造技术研究  

Updating and Transformation Technology of Inefficient Wind-breaking and Sand-fixing Forests in Yulin Sandy Land

作　　者：赵晓彬 苏世平 符亚儒 

机构地区：[1]陕西省治沙研究所,陕西榆林719000

出　　处：《西北林学院学报》2010年第1期104-106,114,共4页Journal of Northwest Forestry University

基　　金：国家林业局林业公益性行业科研专项"陕北资源开发区生态恢复与重建技术研究"(200804016)

摘　　要：榆林沙区原有防风固沙林主要以落叶乔木、灌木、半灌木等植物类型为主,防风固沙效益低下。引进常绿针叶树种樟子松,进行低效防风固沙林更新改造,提高防护效益。通过造林试验认为,樟子松造林成效的高低,核心是造林地土壤有效水分含量的多少,水分条件好,造林成效就好,反之则差;不同植被类型造林地樟子松造林成活率不同,按植被类型排列高低次序为无植被覆盖裸沙地>沙柳林地>紫穗槐林地>杨树林地>柠条林地>花棒与踏郎林地>沙蒿林地;樟子松造林成活率随着造林地植被覆盖率的增大而降低;对于造林地植被生长发育期而言,幼林和过熟林地的樟子松造林成活率比成熟林地的高。The present tree species in wind-breaking and sand-fixing forests in Yulin mainly are deciduous trees, shrubs, and half shrub, with low efficiency of wind-breaking and sand-fixing. Evergreen species Pinus sylvestris var. mongolica was introduced to transform the forests to promote protection effective- ness. Trial afforestation indicated that the key factor for the success of the introduction of conifer species was soil moisture. The survival rate of afforestation with P. sylvestris var. mongolica in different site con- ditions decreased with vegetation coverage, and was in the order of bare sand without vegetation cover〉 Salix woodland〉 Amorpha fruticosa woodland〉 Populus woodland〉Caragana woodland〉 Hedysarum woodland〉Artemisia woodland. In the view of vegetation growing development period, the survival rates of afforestation in young and over-matured stands were higher than that in mature stand.

关 键 词：榆林沙区 低效防风固沙林 更新改造技术 

分 类 号：S727.23[农业科学—林木遗传育种]