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浙江省大量基础设施建设项目的开工建设,在不同地区和不同建设工期表现出的水土流失特征各不相同,且不同的土地利用方式和利用强度造成的水土流失类型和规律也不相同,充分体现了经济发达地区不同于过去和经济相对落后地区的水土流失特征。经济发达地区的水土流失特征可归纳为:水土流失面积小、强度大,强度水土流失空间分布分散、时间集中性强、动态变化速度快,水土流失治理效益显著,人为诱发水土流失突出。出现上述特征的原因可概括为:开发建设项目不同工期水土保持措施效益差异是强度水土流失面积波动的原因之一,经济开发和劳动力转型是水土流失面积减少的原因之一,农业经济林开发建设是导致林地水土流失比重大的原因之一。提出了今后水土保持工作应采取的新措施和重点治理的新方向。
The construction of a large number of infrastructure projects in Zhejiang Province shows different characteristics of soil and water loss in different regions and different construction periods, and the types and laws of soil and water loss caused by different land use patterns and intensity of use are also different The characteristics of soil and water loss in economically developed areas that are different from those in the past and in the relatively backward areas of economy. The characteristics of soil and water loss in economically developed areas can be summarized as follows: small area and high intensity of soil erosion, scattered spatial distribution of intensity of soil erosion, strong time concentration, rapid dynamic change, remarkable soil erosion control benefits and outstanding man-made soil erosion. The reasons for the above characteristics can be summarized as follows: Differences in benefits of soil and water conservation measures during different construction and development periods are one of the reasons for the intensity of soil erosion area loss. Economic development and labor force transformation are one of the reasons for the decrease of soil erosion area. One of the reasons for the large proportion of soil and water loss in forestland. Put forward new measures to be taken in water and soil conservation in the future and new directions for key governance.