excessive deforestation meaning in English

乱砍滥伐

First , erosion resulting from excessive deforestation in the upper reaches of the river and , second , heavy silting which raised the riverbed in the main channel
第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。
Two major factors contributed to devastating summer flooding along the yangtze river and its tributaries . first , erosion resulting from excessive deforestation in the upper reaches of the river and , second , heavy silting which raised the riverbed in the main channel
两个主要因素导致了夏季长江及其支流的特大洪水。第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。