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采用合理的土地利用方式是红壤丘陵区防治洪涝灾害和季节性干旱的重要措施。利用方差分析、回归分析和偏相关分析等统计方法,对红壤坡地7种覆被类型1998~2005年降水特征值和地表径流的关系进行了研究,结果表明:不同覆被类型地表径流系数差异显著,大小排序为农作区>茶园区>湿地松与甜柿园>柑橘园>退化区与恢复区;除茶园外,其他覆被类型径流系数不同水文年有明显差异,且丰水年>平水年、枯水年;平均雨强、最大60 min雨强与径流量都无显著相关性,但农作区径流值与小雨呈显著相关,其他覆被类型径流值与中雨呈显著相关;10~30 cm土壤前期含水量与径流量有较明显正相关关系,40 cm以下土壤水对径流量影响很小,恢复区、甜柿园、柑橘园受前期降水的影响相对较大。
Using reasonable land use patterns is an important measure to prevent floods and seasonal droughts in hilly red soil regions. The relationship between rainfall eigenvalue and surface runoff of seven types of vegetation cover in red soil slope from 1998 to 2005 was studied by means of statistical analysis such as analysis of variance, regression analysis and partial correlation analysis. The results showed that the difference of surface runoff coefficient between different types of vegetation was significant , The order of the size is farming area> tea garden> wetland and persimmon garden> citrus garden> degenerated area and recovery area; except for the tea garden, there are significant differences in runoff coefficient of different types of cover and runoff in different hydrological years, Year and dry years. The average rainfall intensity and rainfall intensity at maximum 60 min were not significantly correlated with runoff. However, the runoff values in farming areas were significantly correlated with the rainfall, while those with other types of cover were significantly correlated with the moderate rainfall. There was a clear and positive correlation between water content and runoff at ~ 30 cm soil depth. Soil water under 40 cm had little effect on runoff. The recovery area, persimmon or citrus orchard had a relatively large influence on the earlier precipitation.