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首页> 外文期刊>Transactions of the ASABE >Differentiating impacts of land use changes from pasture management in a CEAP watershed using the SWAT model. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)
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Differentiating impacts of land use changes from pasture management in a CEAP watershed using the SWAT model. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)

机译：使用SWAT模型，将CEAP流域中土地利用变化与牧场管理的影响区分开来。 （特刊：水土评估工具（SWAT）建模技术：当前状态。）

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Due to intensive farm practices, nonpoint-source (NPS) pollution has become one of the most challenging environmental problems in agricultural and mixed land use watersheds. Usually, various conservation practices are implemented in the watershed to control the NPS pollution problem. However, land use changes can mask the water quality improvements from the conservation practices implemented in the watershed. The objectives of this study were to evaluate the linkage between nutrient input from various pasture management practices and water quality, and to quantify the impacts of land use changes and pasture management on water quality in a pasture-dominated watershed. Land use data from 1992, 1994, 1996, 1999, 2001, and 2004 were evaluated for the land use changes in the watershed, and the corresponding implemented management practices were also incorporated into the Soil and Water Assessment Tool (SWAT) model. The individual impacts of land use change and pasture management were quantified by comparing the SWAT simulation results for different land use change and pasture management scenarios. The results indicated that land use changes resulted in greater total sediment (499 kg ha-1) and nitrogen losses (3.8 kg ha-1) in the Moores Creek subwatershed, whereas pasture management resulted in greater total nitrogen losses (4.3 kg ha-1) in the Beatty Branch subwatershed. Overall, the combined impacts of land use changes and pasture management resulted in greater total sediment (28 to 764 kg ha-1 of cumulative combined impacts between 1992 and 2007) and nitrogen losses (5.1 to 6.1 kg ha-1) and less total phosphorus losses (1.5 to 2.1 kg ha-1) in the Beatty Branch, Upper Moores Creek, and Moores Creek subwatersheds. By quantifying the individual impacts of land use changes and pasture management, we found that an increase in total nitrogen losses in the Beatty Branch subwatershed was mainly due to an increase in nutrient inputs in the pasture areas, and total sediment and nitrogen losses in the Moores Creek subwatershed were mainly due to an increase in urban lands. Therefore, the individual impacts of land use changes and conservation practices should be quantified to get a true picture of the success of CEAP programs in watersheds experiencing significant land use changes.
机译：由于集约化的耕作方式，面源污染已成为农业和混合土地利用流域中最具挑战性的环境问题之一。通常，在流域实施各种保护措施以控制NPS污染问题。但是，土地用途的变化可能会掩盖流域实施的保护实践所带来的水质改善。这项研究的目的是评估各种牧场管理实践中养分输入与水质之间的联系，并量化以牧场为主的流域中土地利用变化和牧场管理对水质的影响。评估了1992年，1994年，1996年，1999年，2001年和2004年的土地利用数据，以评估该流域的土地利用变化，并将相应的实施管理措施纳入了土壤和水评估工具（SWAT）模型。通过比较不同土地利用变化和牧场管理方案的SWAT模拟结果，量化了土地利用变化和牧场管理的个体影响。结果表明，土地利用变化导致摩尔斯河小流域的总沉积物增加（499 kg ha -1 ）和氮损失（3.8 kg ha -1 ），而牧场管理导致Beatty支流域的总氮损失更大（4.3 kg ha -1 ）。总体而言，土地利用变化和牧场管理的综合影响导致更大的总沉积物（1992年至2007年间累积的综合影响为28至764 kg ha -1 ）和氮素流失（5.1至6.1 kg ha Beatty分支，上摩尔斯河和摩尔斯河子流域的 -1 ）和总磷损失（1.5至2.1 kg ha -1 ）更少。通过量化土地利用变化和牧场管理的个体影响，我们发现Beatty Branch小流域的总氮损失增加主要是由于牧区的养分投入增加，以及摩尔斯的沉积物和氮损失总量增加溪小流域主要是由于城市土地的增加。因此，应量化土地利用变化和保护实践的个人影响，以真实地了解CEAP计划在经历重大土地利用变化的流域中的成功。

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