导致贵州喀斯特森林发生退化的原因是火烧、开垦、放牧和樵采。
Fire, reclamation, herd, and cut led to degradation of Karst forest in Guizhou Province.
在造成草地退化的众多因素中，可控因素主要有过度放牧、垦殖、樵采以及政策的导向。
There were many factors contributing to the grassland degeneration, but some were artificial control and others were not.
在造成草地退化的众多因素中，可控因素主要有过度放牧、垦殖、樵采以及政策的导向。
There were many factors contributing to the grassland degeneration, but some were artificial control and others were not.
应用推荐