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• W3213350459 endingPage "107325" @default.
• W3213350459 startingPage "107325" @default.
• W3213350459 abstract "Although the frequency and intensity of seasonal drought and wetness are increasing under climate change background, their effects on soil nitrate nitrogen (NO 3 - -N) leaching have remained unclear. In this study, validated by the field data on a typical tea garden hillslope in Taihu basin, China, the Decomposition-Denitrification (DNDC) model was used to investigate these effects. The decennial drought, decennial wetness, and normal conditions of different seasons were combined to construct 31 scenarios. Results showed that seasonal drought decreased annual NO 3 - -N leaching, with a reduction of 6.52%−18.70% (one-season drought), 18.62%−29.68% (two-season drought), 36.64%−43.99% (three-season drought) and 51.44% (all-season drought) relative to the normal scenario. Except the spring drought, drought in other seasons had legacy effects that increased NO 3 - -N leaching in their succession seasons. The legacy effect of summer drought even continued till the summer of next year. Seasonal wetness increased annual NO 3 - -N leaching, with an increase of 2.58%−11.39% (one-season wetness), 10.04%−22.31% (two-season wetness), 19.50%−29.39% (three-season wetness), and 29.66% (all-season wetness) relative to the normal scenario. Autumn and winter wetness decreased the NO 3 - -N leaching in their succession seasons, while spring and summer wetness had no such effect. Soil NO 3 - -N leaching had positive correlations with precipitation (drought scenarios: r = 0.74; wetness scenarios: r = 0.54) and soil water seepage (drought scenarios: r = 0.62; wetness scenarios: r = 0.56). Weak correlation coefficients between soil NO 3 - -N content and NO 3 - -N leaching were also observed especially under spring drought (r = 0.17) and summer drought (r = 0.14). However, NO 3 - -N leaching was not limited by soil NO 3 - -N content after the application of basal fertilizer . Fertilization plus drought or wetness increased the risk of soil NO 3 - -N leaching. These findings will be benefit for controlling the non-point N loss of tea plantation under the background of climate change. ● Seasonal drought had NO 3 - -N leaching 6.5–51.4% lower than normal scenario. ● Seasonal wetness had NO 3 - -N leaching 2.6–29.7% higher than normal scenario. ● Drought or wetness in autumn and winter had greater impacts on NO 3 - -N leaching. ● Fertilization plus drought or wetness increased the NO 3 - -N leaching risk." @default.
• W3213350459 created "2021-11-22" @default.
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• W3213350459 date "2022-02-01" @default.
• W3213350459 modified "2023-10-09" @default.
• W3213350459 title "Soil nitrate leaching of tea plantation and its responses to seasonal drought and wetness scenarios" @default.
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• W3213350459 doi "https://doi.org/10.1016/j.agwat.2021.107325" @default.
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