季节性干湿气候对茶园坡面土壤硝态氮淋失的影响
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中国科学院南京地理与湖泊研究所

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基金项目:

国家自然科学基金项目(41971117,41901030);江苏省自然科学基金(BK20191096)


Effect of seasonal drought and wetness on soil nitrate leaching loss on slope of tea garden
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Affiliation:

Nanjing Institute of Geography&Limnology, Chinese Academy of Sciences

Fund Project:

National Natural Science Foundation of China (41971117, 41901030); Jiangsu Natural Science Foundation (BK20191096).

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    摘要:

    气候变化背景下,季节性干湿对土壤NO3--N淋失产生重大影响。本文以太湖流域典型茶园为研究对象,基于1960—2019年降雨数据,提取每个季节十年一遇干旱、十年一遇湿润和最接近平均降雨量的气象数据,组合成31种降雨情景,并采用DNDC模型模拟不同情景下NO3--N淋失通量,探讨季节性干湿气候对土壤NO3--N淋失的影响。结果表明:湿润季节越多,NO3--N的淋失通量越大,反之则越小;NO3--N淋失容易发生在降雨集中的季节、施肥之后的雨期或干旱之后的雨期。春季和秋季干旱会导致NO3--N淋失通量大幅减小,减幅分别为83.9%和63.4%;秋季或冬季干旱时,如果后续季节遇到降雨,NO3--N淋失通量均有明显增加。春季湿润导致NO3--N淋失通量大幅增加,增幅为50.5%左右;而秋季湿润对NO3--N淋失通量无明显影响。季节性干旱情景下,NO3--N淋失存在滞后效应,对后续季节NO3--N的淋失影响显著,到来年夏季结束;季节性湿润情景下,NO3--N淋失存在提前效应,但对后续季节NO3--N淋失影响较小,到来年秋季结束。本研究有助于气候变化背景下面源氮素损失的风险评估和精准农业管理。

    Abstract:

    In the context of climate change, seasonal drought and wetness have a significant impact on soil NO3--N leaching. Based on precipitation data from 1960 to 2019, this paper extracts meteorological data from decennial drought, decennial wetness and nearest average precipitation in each season, combining into 31 precipitation scenarios, and uses DNDC model to simulate NO3--N leaching flux in different scenarios, the effects of seasonal wet and dry climate on soil NO3--N leaching were explored. The results showed that the more wet seasons, the larger NO3--N leaching flux, and vice versa. The NO3--N leaching is more likely to occur in the rainy season, the rainy period after fertilization or drought. Drought in spring and autumn will cause a significant reduction in NO3--N leaching flux by 83.9% and 63.4%, respectively; while when rainfall occurs in subsequent seasons of the drought in autumn or winter, the NO3--N leaching flux increases significantly. Wet spring leads to a significant increase in NO3--N flux, with an increase of about 50.5%. However, wet autumn has no obvious effect on NO3--N leaching flux. Under the seasonal drought scenarios, NO3--N leaching performs a lagging effect, which poses a significant impact on the subsequent season, and ends in the coming summer; under the seasonal wetness scenarios, NO3--N leaching performs an advancing effect, but it has a small effect on the subsequent season, and ends in the following autumn. This study will be benefit for the risk assessment of non-point source nitrogen loss and the precise agricultural management under the background of climate change.

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  • 收稿日期:2020-12-16
  • 最后修改日期:2021-03-07
  • 录用日期:2021-03-07
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