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首页> 外文期刊>International Journal of Environmental Research and Public Health >A Statistical Assessment of the Impact of Agricultural Land Use Intensity on Regional Surface Water Quality at Multiple Scales
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A Statistical Assessment of the Impact of Agricultural Land Use Intensity on Regional Surface Water Quality at Multiple Scales

机译：多尺度下农业土地利用强度对区域地表水水质影响的统计评估

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摘要

Understanding the effects of intensive agricultural land use activities on water resources is essential for natural resource management and environmental improvement. In this paper, multi-scale nested watersheds were delineated and the relationships between two representative water quality indexes and agricultural land use intensity were assessed and quantified for the year 2000 using multi-scale regression analysis. The results show that the log-transformed nitrate-nitrogen (NO3-N) index exhibited a relationship with chemical fertilizer input intensity and several natural factors, including soil loss, rainfall and sunlight at the first order watershed scale, while permanganate index (CODMn) had a positive relationship with another two input intensities of pesticides and agricultural plastic mulch and organic manure at the fifth order watershed scale. The first order watershed and the fifth order watershed were considered as the watershed adaptive response units for NO3-N and CODMn, respectively. The adjustment of agricultural input and its intensity may be carried out inside the individual watershed adaptive response unit. The multiple linear regression model demonstrated the cause-and-effect relationship between agricultural land use intensity and stream water quality at multiple scales, which is an important factor for the maintenance of stream water quality.
机译：了解密集的农业土地利用活动对水资源的影响对于自然资源管理和环境改善至关重要。本文描述了多尺度嵌套流域，并通过多尺度回归分析对2000年两个代表性水质指标与农业土地利用强度之间的关系进行了评估和量化。结果表明，一阶流域尺度上对数转化的硝态氮（NO3-N）指数与化肥投入强度和土壤流失，降雨和日光等几个自然因素有关，而高锰酸盐指数（CODMn）与对数转换有关。与五阶流域尺度上的农药，农用塑料覆盖物和有机肥料的另外两种输入强度呈正相关。一阶流域和五阶流域分别被视为NO3-N和CODMn的流域自适应响应单位。农业投入及其强度的调整可在各个流域自适应响应单元内进行。多元线性回归模型表明农业土地利用强度与溪流水质之间存在因果关系，这是维持溪流水质的重要因素。

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