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一提起陕南汉江流域,遍地茂林修竹、处处青山绿水的联想就不禁油然而生,总以为在这样的地方,不会有什么水土流失,因而就忽视了那里的水土保持工作。然而,严酷的现实一再提醒我们,这种看法是十分片面和肤浅的。经过深入调查,发现虽然一些山深林密的地区至今还保留着山青水秀的景色,但大面积的浅山丘陵地区,甚至一部分深山区,由于长时期以来的人为的破坏,水土流失已达到相当严重的程度,如不改变过去的陈旧观念,就会贻误今后的工作。 一、水土流失的严重情况 陕南汉江流域属长江水系,包括安康地区的全部和汉中、商洛地区的大部。此地为北亚热带,年平均气温12～14度,无霜期240～260天,气候温和,年平均降水量800～1400毫米,因此多数地方山林蓊郁,草坡葱茏,土壤和基岩能够得到植被较好的保护,水土
When it comes to mentioning the Han River basin in South China and the practice of cultivating bamboo in Maolin all over the world, the association of mountains and rivers everywhere can not help but spontaneously think that in such places there will be no water and soil erosion and soil and water conservation there will be neglected. However, the harsh reality has repeatedly reminded us that this view is very partial and superficial. After in-depth investigation, we found that although some mountainous and densely-populated areas still retain the beautiful scenery, the large area of hills and hills and even some of the mountainous areas have reached serious proportions of soil and water loss due to man-made damage caused by prolonged periods If we do not change the stereotypes of the past, we will end up with future work. First, the serious situation of soil erosion Han River basin in southern Shaanxi is the Yangtze River, including all the well-being of Ankang and most of the Hanzhong and Shangluo areas. The area is north of the subtropical zone, with an average annual temperature of 12-14 degrees and a frost-free period of 240-260 days. The climate is mild and the average annual precipitation is 800-1,400 mm. Therefore, the vegetation in most areas is stagnant, grassy slope, verdure, soil and bedrock Good protection, soil and water