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首页> 外文期刊>Transactions of the ASABE >ESTIMATING THE EFFECTS OF AGRICULTURAL CONSERVATION PRACTICES ON PHOSPHORUS LOADS IN THE MISSISSIPPI-ATCHAFALAYA RIVER BASIN
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ESTIMATING THE EFFECTS OF AGRICULTURAL CONSERVATION PRACTICES ON PHOSPHORUS LOADS IN THE MISSISSIPPI-ATCHAFALAYA RIVER BASIN

机译：估算密西西比-阿奇塔法利雅河流域的农业保护措施对磷负荷的影响

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Agriculture in the Mississippi-Atchafalaya River basin (MARB) is important in terms of both the national economy and the nutrients discharged to the basin and the Gulf of Mexico. Conservation practices are installed on cropland to reduce the nutrient losses. A recent study by the Conservation Effects Assessment Project (CEAP) determined the effects of agricultural conservation practices on water quality in the MARB. A modeling framework consisting of a farm-scale model (Agricultural Policy Environmental Extender, APEX), a watershed-scale model (Soil and Water Assessment Tool, SWAT), and databases was used APEX was used to simulate the conservation practices on cropland and Conservation Reserve Program (CRP) land and assess the edge-of-field water quality benefits. The predicted flow and loads from APEX were input to SWAT, and SWAT was used to simulate the watershed processes and estimate the local and instream water quality benefits. The model was used for scenario assessment after calibration and validation for streamflow and loads. Recent studies indicate that phosphorus influences the formation of the hypoxic zone in the Gulf of Mexico. The major objectives of this article are to: (I) estimate and discuss the effects of currently existing and additional conservation practices on total phosphorus (TP) loads in the MARB, and (2) assess how TP loads discharged by the conservation scenarios can achieve the recommended annual P target for hypoxia reduction. Results indicated that current conservation practices on cropland have reduced TP losses to local waters by 13% to 52% in six basins within the MARB and reduced the TP load discharged to the Gulf of Mexico by 22%. Additional P load reduction is likely required to reach the annual P target for hypoxia reduction.
机译：密西西比-阿恰法拉亚河流域（MARB）的农业对国民经济以及流向该盆地和墨西哥湾的养分均很重要。在农田上采取了保护措施，以减少养分流失。保护影响评估项目（CEAP）的最新研究确定了MARB中农业保护措施对水质的影响。使用由农场规模模型（农业政策环境扩展者，APEX），分水岭规模模型（土壤和水评估工具，SWAT）和数据库组成的建模框架，使用APEX来模拟农田和自然保护区的保护实践储备计划（CRP）土地并评估田间水质优势。来自APEX的预测流量和负荷被输入到SWAT，SWAT被用来模拟流域过程并估算当地和河川水质的收益。在对流量和负载进行校准和验证之后，该模型用于方案评估。最近的研究表明，磷会影响墨西哥湾缺氧区的形成。本文的主要目标是：（I）评估和讨论当前和其他保护措施对MARB中总磷（TP）负荷的影响，以及（2）评估保护情景所释放的TP负荷如何实现推荐的减少低氧的年度P目标值。结果表明，目前对农田的保护措施已将MARB内六个盆地的当地水体的TP损失降低了13％至52％，并将排放到墨西哥湾的TP负荷降低了22％。为达到减少缺氧的年度P目标，可能需要额外降低P负荷。

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