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为明确秸秆集中掩埋还田对麦田养分淋失的影响,以期为秸秆掩埋还田提供理论依据,开展了桶栽模拟试验,试验设置了H1:麦秸20 cm埋深(5 kg m-2埋量)、H2(L1):35 cm埋深(5 kg m-2埋量)、H3:50 cm埋深(5kg m-2埋量)、L2:10 kg m-2埋量(35 cm埋深)、L3:15 kg m-2埋量(35cm埋深)及CK:麦秸不还田等6个处理,研究了秸秆不同埋深和埋量下麦田氮磷养分的淋失情况。结果表明:相同埋量条件下,秸秆不同埋深处理对麦田渗漏总量基本没有影响;相同埋深条件下,秸秆埋量为10 kg m-2和15 kg m-2时会显著增加麦季渗漏量,但埋量为5 kg m-2时则无显著影响;整个小麦生育期内,秸秆相同埋量条件下,H1对麦田氮素的拦截效果明显优于H2、H3和CK,对磷素的拦截效果则以H1为最高;相同埋深条件下,L2处理下对麦田氮素的拦截效果明显优于L1、L3和CK,L3处理下对磷素拦截效果最差。
In order to clarify the effect of straw mulching and returning fields on nutrient leaching in wheat fields, a theoretical basis for the straw mulching and returning fields was provided, and a barreled simulation experiment was carried out. The experiment set H1: straw 20 cm depth (5 kg m-2) ), H2 (L1): Depth at 35 cm (5 kg m-2), H3: Depth at 50 cm (5 kg m-2), L2: 10 kg m- ), L3 (buried depth of 15 kg m-2) and CK (straw not returning) were used to study the leaching of nitrogen and phosphorus in wheat fields under different burial depths and burial depths. The results showed that under the same burial depth, the total burial depth of straw did not affect the total leaching amount of wheat straw at the same burial depth. When the burial amount of straw was 10 kg m-2 and 15 kg m-2, But no significant effect was observed when the amount of leakage was 5 kg m-2. During the whole wheat growth period, the interception effect of H1 on nitrogen in wheat field was obviously better than H2, H3 and CK under the same amount of straw, Under the same depth, the interception of nitrogen in wheat field under L2 treatment was significantly better than that of L1, L3 and CK, and the interception effect of phosphorus on L3 was the worst.