Abstract 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-till, mulch-till and minimum till) in a short-term field experiment with the conventional one. N losses from plots of the no-till and minimum till 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-till (bootstrap confidence intervals of −48.76% to −13.23%) was more effective in reducing N losses than mulch-till (bootstrap confidence intervals of −56.65% to 14.52%). Moreover, the effect of no-till was stronger (bootstrap confidence intervals of −66.38% to −34.29% and −69.32% to −34.29%, respectively) on carbon-poor (

中文翻译：

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保护性耕作做法减少了三峡水库地区倾斜高地的氮损失：免耕优于覆盖耕作

摘要 氮（N）损失导致了一系列生态问题，如面源污染和水体富营养化。通过在短期田间比较三种保护性耕作方式（免耕、覆盖耕作和最少耕作）的氮损失，研究了耕作方式对三峡水库（TGR）地区斜坡高地氮损失的影响用传统的做实验。免耕和最小耕作处理地块的氮损失比传统耕作处理地块的氮损失分别少 19.03 和 6.33 kg N ha-1。此外，对 1991 年至 2017 年间发表的相关数据的荟萃分析表明，保护性耕作（引导置信区间为 -57.35% 至 -7.86%）比传统耕作更能显着减少氮损失。免耕（自举置信区间为 -48.76% 至 -13.23%）在减少氮损失方面比覆盖耕作（自举置信区间为 -56.65% 至 14.52%）更有效。此外，免耕对碳贫乏的影响更强（bootstrap 置信区间分别为 -66.38% 至 -34.29% 和 -69.32% 至 -34.29%）