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通过坡地渗漏小区定位试验,研究总施氮量相同情况下,施肥方式对紫色土坡耕地氮素淋失的影响.结果表明,有机-无机肥配施会影响紫色土硝酸盐向下累积过程,显著降低紫色土坡耕地硝酸盐累积量.渗漏液中硝态氮含量在0.15～46.99mg·L-1之间,占总氮含量的66.4%～96.3%;总氮淋失量在(4.05±0.37)～(37.82±0.86)kg.hm-2之间,占当季施氮量的2.7%～25.2%.在维持总施氮量相同的条件下,与常规氮磷钾施肥相比,农家肥、秸秆与化肥配合施用的渗漏液总氮含量分别降低了71.0%、61.4%,总氮淋失量分别降低了48.1%、31.6%.这表明有机-无机肥配施能显著降低紫色土坡耕地氮素淋失量,对有效控制紫色土区浅层地下水硝酸盐污染具有重要作用.
Through the plot test of seepage plots on sloping land, the effect of fertilization mode on nitrogen leaching in sloping farmland of purple soil under the same total nitrogen application was studied.The results showed that the combination of organic-inorganic fertilizers would affect the downward accumulation of nitrate in purple soil , Significantly reducing the nitrate accumulation in sloping farmland of purple soil.The content of nitrate nitrogen in leachate ranged from 0.15 to 46.99 mg · L-1, accounting for 66.4% to 96.3% of the total nitrogen content; 4.05 ± 0.37) ~ (37.82 ± 0.86) kg.hm-2, accounting for 2.7% ~ 25.2% of the total nitrogen application rate in the same season, compared with the conventional NPK fertilization , Total nitrogen content of leachate decreased by 71.0%, 61.4% and leaching loss of total nitrogen by 48.1% and 31.6%, respectively, compared with that of manure, straw and chemical fertilizer, which indicated that organic-inorganic fertilizer application could be significantly reduced The amount of nitrogen leaching on sloping cultivated land in purple soil plays an important role in controlling nitrate pollution in shallow groundwater in purple soil area effectively.