数字农科院2.0

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

作者： Zhang, Y; Xie, DT; Ni, JP; Zeng, XB

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

ISSN： 0167-8809

年卷期： 2020 年 300 卷

页码：

收录情况： JCR（2021版）

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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