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韩江上游梅县地区水土流失面积2556.04km~2占全区面积16.7%.以五华县最为严重,五华县水土流失面积达875.83km~2.占全县土地面积的26.8%,占山地面积38.2%.韩江上游水土流失区的母岩绝大多为花岗岩,其次是红色砂岩.这些岩石的风化层甚厚,风化岩体达20多m.风化土中粗砂粒多,极疏松.由于人为地乱砍森林,割草,不合理方式的种植木薯.山地失去植被的保护,水土流失愈来愈严重.1985年七、八月间,我们到五华、兴宁、梅县和蕉岭水土流失区考察,了解其水土流失现伏,探讨其流失原因,调查和参观整理成功的经验.
The area of soil and water loss in Meixian upstream of Hanjiang River is 2556.04km ~ 2, accounting for 16.7% of the total area of the whole area. The most serious is Wuhua County, with an area of 875.83km ~ 2 for Wuhua County, accounting for 26.8% of the total land area of the county, 38.2% .While the parent rock in the upper reaches of the Hanjiang River water and soil loss area is mostly granite, followed by the red sandstone.The weathering of these rocks is very thick, weathered rock mass of more than 20 m.Weathered grit soil and more, very loose.As human Lost forests, mowing, unreasonable ways of planting cassava. Loss of vegetation in mountainous areas, soil erosion is more serious .In July and August 1985, we went to Wuhua, Xingning, Meixian and Jiaoling soil erosion Examine the area, understand the current situation of soil and water loss, explore its causes of loss, investigate and visit the finishing experience.