英语翻译树木的大量砍伐导致水土流失.a lot of tree are cut down resulting in wa

deforestation"滥砍滥伐 ";water loss and soil erosion"水土流失 ";导致可以是lead to或者是result in,那么整句话连起来就是Deforestation leads to（results in）water loss and soil erosion.
至于你给出的例子,a lot of tree are cut down是句子主干,resulting in water and soil erosion用非谓语动词做结果状语很好,但是要注意tree是可数名词,所以应该是a lot of trees,另外结果状语resulting应该与句子主干用逗号隔开,所以改正过来就是A lot of trees are cut down,resulting in water and soil erosion.