摘要
通过对黑河流域高台地区防风固沙林体系的定位观测,分析了该区防风固沙林20年来的生态效益变化。研究结果表明：在防风固沙效益方面,花棒×柠条锦鸡儿×梭梭混交林最好,梭梭纯林（6m×9m）最差;防风固沙林建立20年后,林内土壤粗粒沙（1.0～0.5mm）含量降低66.4%,而〈0.25mm的细沙和粉（黏）沙含量由12.8%提高至72.0%,土壤有机质含量提高30.1%,土壤全N增加48.3%,全P增加76.3%,全K增加58.0%,土壤pH值和全盐量均有降低。20年来防风固沙林的防风固沙效益和改土作用显著。
This paper,through positioning observation of sand-fixation windbreak systems in Gaotai region of Heihe River valley,analyzed changes in ecological effect of sand-fixation forest in recent 20 years.The analysis reveal following results： With regard wind prevention and sand-fixation,Headysarum scoparium×Caragana korshinskii×Halloxylon ammondendron windbreak system proves to be the best,while pure Haloxyllon ammondendron forest（6m×9m） is simply the worst.20 years after the establishment of sand-fixation forests,the intensity of crude sand particles（sand particles between 1.0～0.5mm in diameter） in the forest drops by 66.4%,while fine sand particles（less than 0.25mm） increase from 12.8% to 72.0%.Soil organic matter increases by 30.1%,total soil nitrogen by 48.3%,total soil phosphate by 76.3%,and total soil potassium by 58.0%.Both soil pH and total salt drop.There is a significant positive ecological effect of both sand-fixation forests and windbreaks on Heihe River valley soils in the past 20 years.
出处
《中国生态农业学报》
CAS
CSCD
2007年第6期26-29,共4页
Chinese Journal of Eco-Agriculture
基金
甘肃沙漠综合治理技术研究创新团队项目
甘肃省科学事业项目(QS041-C31-02)资助
关键词
黑河流域
防风固沙林
生态效益
改土效应
Heihe River valley,Sand-fixation forest,Ecological effect,Soil improvement
