求翻译：最靠近河道水体宽约15m的林带是受保护的永久性植被；中间较宽的林带允许有规划地进行砍伐，提供有用的林产品；最靠近田地是宽约8m的缓冲草地带，这种缓冲模式在美国东南部平原上受到了很好的农业面源污染防治效果。是什么意思？

15m wide river water body closest to the forest is permanently protected vegetation; the middle of a wider plan to carry out forest felling is allowed to provide useful forest products; closest to the field is 8m wide grass buffer strip, this buffer model in the southeastern plains of the United Sta

[object Object]

Most approaches river course water body width approximately 15m the forest belt is the permanent vegetation which protects; The middle wide forest belt permission has the plan to carry on the felling, provides the useful forest product; Most approaches the paddies is the width approximately 8m cushi

Closest to the River wide 15m permanent vegetation of the forest is protected; the Middle wide belts allow planning and logging, forest products that provide useful; closest to field the wide grass 8M buffer zone, the buffer model in the United States on the South-Eastern Plains were very good agric

Closest to the River wide 15m permanent vegetation of the forest is protected; the Middle wide belts allow planning and logging, forest products that provide useful; closest to field the wide grass 8M buffer zone, the buffer model in the United States on the South-Eastern Plains were very good agric