论文部分内容阅读
一、人为因素是导致韩江上游水土流失急剧发展的直接原因人类活动的影响,是造成水土流失的重要原因.韩江上游地区许多大崩口的形成过程,据专家考察约有120～150年左右历史,五华县的记载是1932年发展成类似今天这么严重的.该县的棉洋区,1958年以前森林覆盖48%,有50多万株各种果树,到了1980年,森林覆盖下降为12%,其所以形成今天状态,显然是由于毁林毁果乱开荒造成的.
First, the human factor is the direct cause of the rapid development of soil erosion in the upper reaches of the Hanjiang River, which is the direct cause of human activities and is an important cause of water and soil loss. The formation process of many large chinks in the upper reaches of the Hanjiang River is about 120 to 150 years History, records of Wuhua County developed to be similar to today’s graveness in 1932. Mianyang District in the county, with 48% of the forest before 1958, had more than 500,000 kinds of various fruit trees. By 1980, the forest coverage had dropped to 12%, which formed the state today, apparently due to deforestation and indiscriminate wasteland caused.