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降雨是土壤侵蚀的主要动力因子,侵蚀性降雨标准的获取是计算降雨侵蚀力的重要环节;目前,红壤区侵蚀性降雨标准不一致,需要进一步研究。利用2001—2009年的1359场降雨数据,对赣北第四纪红壤区不同下垫面的侵蚀性降雨标准进行研究,得出结论如下:1)不同下垫面满足拟定侵蚀性降雨标准的数据序列长度存在明显差异,满足拟定侵蚀性降雨标准的数据序列长度可以反映水土保持措施从实施到发挥稳定效益所需的年限;2)具有水土保持措施的下垫面能够有效提高侵蚀性雨量标准,柑橘+前埂后沟梯壁植草水平梯田的第5小区侵蚀性雨量标准为16.2mm,比地表裸露小区的11.4mm提高42.1%;3)对于没有水土保持措施或稳定性高的水土保持措施下垫面,宜采用时段侵蚀性雨强标准;对于稳定性低的水土保持措施下垫面,宜采用侵蚀性雨量标准。该研究为区域水土保持规划提供参考。
Rainfall is the main driving force of soil erosion. The acquisition of erosive rainfall standards is an important part of rainfall erosivity calculation. At present, the standard of eroding rainfall in red soil area is inconsistent and needs further study. Based on 1359 rainfall data from 2001 to 2009, the erosional rainfall patterns of different underlying surfaces in the Quaternary red earth area of northern Jiangxi Province were studied. The conclusions are as follows: 1) The data of different underlying surfaces meeting the erosive rainfall standard The length of the data sequence that satisfies the erosive rainfall standard can reflect the years required for the implementation of soil and water conservation measures to achieve stable benefits. 2) The underlying surface with soil and water conservation measures can effectively improve the erosive rainfall standard, The erosive rainfall of the 5th plot of citrus + anterior posterior ditch ladder-like wall terrace is 16.2mm, which is 42.1% higher than the 11.4mm of the bare surface of the forest. 3) For the soil and water conservation measures without soil and water conservation measures or with high stability Paddy surface, it is appropriate to adopt the standard of rainfall erosivity; for low stability of paddy soil and water conservation measures surface, should adopt the erosive rainfall standard. The study provides a reference for regional soil and water conservation planning.