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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Assessing climate change impacts on winter cover crop nitrate uptake efficiency on the Coastal Plain of the Chesapeake Bay Watershed using SWAT model
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Assessing climate change impacts on winter cover crop nitrate uptake efficiency on the Coastal Plain of the Chesapeake Bay Watershed using SWAT model

机译：评估气候变化对冬季覆盖作物硝酸盐摄取效率的影响，采用SWAT模型对Chesapeake海湾流域的沿海平原

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Climate change is expected to exacerbate water quality degradation in the Chesapeake Bay Watershed (CBW). Winter cover crops (WCCs) have been widely implemented in this region due to their high effectiveness at reducing nitrate loads. However, littleis known about climate change impacts on the effectiveness of WCCs for reducing nitrate loads. The objective of this study is to assess climate change impacts on WCC nitrate uptake efficiency on the Coastal Plain of the CB W using Soil and Water Assessment Tool (SWAT) model. We prepared climate change scenarios using General Circulation Models (GCMs) under three greenhouse emission scenarios (e.g., A1B, A2, and Bl). Simulation results showed that WCC biomass increased by ~ 58 % under climate change scenarios, due to climate conditions conducive to WCC growth. Prior to WCC implementation, annual nitrate loads increased by ~ 43 % (5.3 kgN-ha~(-1)) under climate change scenarios compared to the baseline scenario. When WCCs were planted, nitrate loads weresubstantially reduced and WCC nitrate reduction efficiency increased by.~ 5 % under climate change scenarios relative to the baseline, due to increased WCC biomass. Therefore, the role of WCCs in mitigating nitrate loads should increase in the future given predicted climate change.
机译：预计气候变化将加剧Chesapeake湾流域（CBW）的水质降解。由于其在减少硝酸盐载荷的高效力，冬季覆盖作物（WCCS）已广泛实施。然而，关于气候变化的LOSTIS对WCCS减少硝酸盐负荷的效果影响。本研究的目的是评估利用土壤和水评估工具（SWAT）模型对CB W沿海平原对沿海平原的气候变化影响。我们使用三个温室发射场景（例如，A1B，A2和BL）下使用一般循环模型（GCM）的气候变化方案。仿真结果表明，由于有利于WCC增长的气候条件，WCC生物量在气候变化方案下增加了〜58％。与基线情景相比，在WCC实施之前，年度硝酸盐载荷增加了气候变化方案下的〜43％（5.3 kgn-ha〜（-1））。当种植WCCS时，由于WCC生物质增加，硝酸盐荷载性致华，硝酸盐载荷比较降低，硝酸盐降低效率在气候变化方案下增加。〜5％。因此，WCCS在减轻硝酸盐载荷时的作用应在预测的气候变化的未来增加。

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