切沟侵蚀不仅破坏土地资源，而且影响下游地区环境。
Gully erosion damages land resources and causes site off environmental problems.
破坏土地资源的调查与评价，是制定土地复垦规划的必要前提。
The survey and evaluation of the destroyed land waiting to be reclaimed are the necessary premises to constitute the reclamation planning of the land.
本发明不仅具有制作成本较低、不 破坏土地资源和不会影响生态环境的优点，而且还具有吸音效果好、重量轻、变废为宝的优 点。
The method has the advantages of low manufacturing cost, no destruction of land resources, no influence on ecological environment, good sound-absorbing effects, light weight and waste recycle.
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