降雨产沙资料整理方法对两者关系的影响

合理的水土流失资料整理方法是挖掘数据内在规律的基础，通过采集江西省赣县花岗岩次生马尾松林地不同植被恢复类型小区2010—2011年2 a的降雨产沙资料，研究了4种整理方法对降雨产沙关系的影响。结果表明:加大资料整理的时间尺度和降雨间隔时间，可以显著提高降雨产沙之间的相关性，同时整理方法对拟合曲线的性质产生影响，综合考虑拟合优度和曲线性质的一致性，可以采取周晴方法的幂函数来描述不同类型小区降雨产沙之间的内在关系；植被恢复减弱了产沙速率，随着降雨量的增加，纯林小区的产沙速率下降，百喜草恢复小区变化缓慢，低郁闭度胡枝子恢复小区增加迅速，因此侵蚀严重的林地应首先实施草本植被恢复，逐步实现乔灌草生态结构恢复。

Effect of Mining Methods of Data of Rainfall and Sediment on the Relationship between Rainfall and Sediment Yield

The reasonable mining method of soil erosion data is the foundation of exploiting data characteristic. Rainfall and sediment data of different vegetation restoration plots were collected from 2010 to 2011 in the ganxian county of jiangxi province. The relationships between precipitation and sediment were investigated by using four kinds of methods. The results indicated that expanding the time scale and interval of rainfalls could significantly improve the correlation between precipitation and sediment yield. Meanwhile, characteristic parameters of the fitting cures were impacted by different methods. Comprehensively considering the coefficient of determination and consistency of the cures properties, power function could describe the relationships between precipitation and sediment yield for different type plots with the method of interval of rainfalls not less than 7 days (interval between rainfalls less than 7 days as a statistical unit for the data). However, sediment rate in pure forest plot (Pinus massoniana) was significantly higher than those in vegetation restoration plots (Paspalum notatum and Lespedeza bicolor) in Pinus massoniana forest. With precipitation increase, sediment rate reduced down for pure forest plot, changed slowly for Paspalum notatum plot, increased rapidly for Lespedeza bicolor plot with lower canopy density. Therefore, controlling soil and water loss of eroded forestland was regarded as the primary task, and herbal should be grown firstly in the early period of vegetation restoration and progressive realization ecological community restoration of multi-layers structure with tree-shrub-herbal.