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对菲律宾北部卡格扬河谷旱作高地区雨情和作物管理措施的影响进行了调查。该研究目的在于评价水蚀预报模型(WEPP)在估算旱稻栽培中的土壤侵蚀率和径流量估算的性能和可行性。研究了自动气象站和采用了3种养护管理作为处理的侵蚀点。对降雨特征(数量、强度、持续时间和频率)与侵蚀数据的关系进行了分析。对不同降雨量、坡度和水土保持情况的实测数据、模拟数据和敏感性分析进行了比较。统计学验证结果表明,WEPP模型可接受。实测和仿真数据表明,当田块周边设有绿篱时,可以减少50%的水土流失。水土流失率与坡度和长度呈线性关系,当坡降为10%~50%,坡长为10~40 m时,水土流失率为1.2~48.46 thm2。该模型可用于开发水土保持和丘陵地区农业流域农场资源优化和利用,提高可持续发展生产力的决策支持工具。
The impact of rain conditions and crop management practices in the dry farming highlands in the northern Qanagh valley of the Philippines was investigated. The purpose of this study was to evaluate the performance and feasibility of the Water Erosion Prediction Model (WEPP) in estimating soil erosion and runoff in upland rice cultivation. Studied weather stations and used three kinds of conservation management as the treatment of erosion points. The relationship between rainfall characteristics (quantity, intensity, duration and frequency) and erosion data was analyzed. The measured data, simulation data and sensitivity analysis of different rainfall, slope and water and soil conservation were compared. Statistical validation results show that the WEPP model is acceptable. The measured and simulated data show that when there are hedges around the plots, soil erosion can be reduced by 50%. Soil erosion rate has a linear relationship with slope and length. When slope gradient is 10% ~ 50% and slope length is 10 ~ 40 m, soil erosion rate is 1.2 ~ 48.46 thm2. The model can be used to develop decision support tools for optimizing and utilizing farmland resources in agricultural watersheds and hilly areas and improving productivity for sustainable development.