Conservation tillage practices reduce nitrogen losses in the sloping upland of the Three Gorges Reservoir area: No-till is better than mulch-till

文献类型： 外文期刊

第一作者： Zhang, Yang

作者： Zhang, Yang;Zeng, Xibai;Xie, Deti;Ni, Jiupai

作者机构：

关键词： Nitrogen losses; Meta-analysis; No-till; Mulch-till; Three Gorges Reservoir area

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN： 0167-8809

年卷期： 2020 年 300 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) losses contribute to a series of ecological problems such as non-point source pollution and aquatic eutrophication. The effects of tillage practices on N losses in the sloping upland of the Three Gorges Reservoir (TGR) area was studied by comparing N losses of three conservation tillage practices (no-fill, mulch-fill and minimum fill) in a short-term field experiment with the conventional one. N losses from plots of the no-fill and minimum fill treatments were less than those from plots of the conventional tillage treatment by 19.03 and 6.33 kg N ha(-1), respectively. Moreover, a meta-analysis of related data published between 1991 and 2017 was showed that conservation tillage (bootstrap confidence intervals of - 57.35% to - 7.86%) significantly reduced N losses more than conventional tillage. No-fill (bootstrap confidence intervals of - 48.76% to - 13.23%) was more effective in reducing N losses than mulch-fill (bootstrap confidence intervals of - 56.65% to 14.52%). Moreover, the effect of no-fill was stronger (bootstrap confidence intervals of - 66.38% to - 34.29% and - 69.32% to -34.29%, respectively) on carbon-poor (< 10 g kg(-1)) and N-poor (< 0.7g kg(-1)) soils. These results indicate that the conservation tillage practice significantly reduced N losses (especially N losses via surface runoff) in the sloping upland of the TGR area compared with conventional tillage and the no-fill was more effective at reducing N losses than mulch-fill in the nutrient-poor soil. Moreover, no-fill did better in reducing the N losses in surface runoff than in subsurface leachate. Therefore, we recommend the use of no-fill as a farming practice to reduce N losses and facilitate the sustainable development of agriculture in the sloping upland of the TGR area.

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