As an important component in hydrological process , forest vegetation influences critically the spatial distribution of hydrological fluxes such as precipitation , evapo - transpiration , and runoff 摘要森林植被层作为水文环境要素,对降水、蒸散和径流等水文通量在空间上的分布特徵有著重要的影响作用。
The competent forestry authorities at a higher level shall periodically urge and inspect the competent forestry authorities at a lower level in the organization of afforestation and recovery of forest vegetation 上级林业主管部门应当定期督促、检查下级林业主管部门组织植树造林、恢复森林植被的情况。
It is one of the largest scenic spots in siniao region . the numerical classification , analysis of species diversity and interspecific association of the forest in meizi lake area were conducted . 1 本文采用样方法,设置了14个20m 20m的样方,对梅子湖的森林植被进行了数量分类、物种多样性分析和种间联结的研究。
That is the rapid drop of forest , and the series of problems caused by it , such as reduction of creature , change of hydromy , frequent occurrence of natural disasters 第五节对陕北明清时代的自然环境演变进行了剖析,在全面总结森林植被减少、水土流失加剧以及土壤沙漠化的基础上,提出了自己对陕北今后发展的几点浅见。
Though dingtian temple reserves the most original natural forest , it still needs an overall planning and greening to create an elegant environment for the purpose of building national forest park 顶天寺景区虽然保存了最原始的自然森林植被资源,但作为创建国家级森林公园项目,还必须进行整体设计规划及植树造林,创造优美环境。
And it is pointed out in this paper that it is the best choice to take the pattern of exploying resources and protecting ecological environment simultaneously to ensure the sustainable development 针对岷江上游的实际情况,论述森林植被的恢复与保护在生态环境建设中的作用。提出采取资源开发和生态环境保护并重的发展模式是实现岷江上游可持续发展的最佳选择。
The results showed that forest vegetation could effectively conserve water and soil and improve entironment , while the effects of water and soil conservation were significant varied between different vegetations , the effect of mixed forest was significant 结果表明,森林植被能有效地保持水土,改善生态环境,但不同植被下保持水土的效果有明显差异,尤以混交林保持水土效果显著。
Yellow river region , because forest vegetation is destroyed by men , it causes serious soil erosion , land desertification , finally result in blocking in river course and floods , even may become a barren land 都是因为森林植被受到人为的破坏,造成严重的水土流失土地沙漠化,最终导致河道淤塞河水泛滥,甚至成为不毛之地的。土地是人类生存的基地,土地沙漠化,是当今世界严重的环境问题。
Yellow river region , because forest vegetation is destroyed by men , it causes serious soil erosion , land desertification , finally result in blocking in river course and floods , even may become a barren land 都是因为森林植被受到人为的破坏,造成严重的水土流失、土地沙漠化,最终导致河道淤塞、河水泛滥,甚至成为不毛之地的。土地是人类生存的基地,土地沙漠化,是当今世界严重的环境问题。
Based on investigation of natural forest vegetation in chaoguanxigou watershed of rocky mountain area of north of china , the composition of species , structure of dbh of trees and species diversity of trees and shrubs in the course of forest succession are researched 摘要基于华北土石山区潮关西沟流域天然森林植被调查的基础上,对森林植被群落演替中群落树种组成、胸径结构和生物多样性变化进行了研究。