横垄覆膜对丹江口库区土壤净氮矿化的影响

发布时间：2018-05-04 08:27

本文选题：横垄覆膜 + 土壤净氮矿化　；参考：《水土保持学报》2017年04期

【摘要】：以丹江口库区五龙池小流域玉米黄棕壤为例,利用原位矿化试验,通过与横垄无覆膜土壤比较,研究横垄覆膜对土壤净氮矿化的影响。结果表明:玉米苗期中期和拔节期前期,横垄覆膜土壤净氮矿化量与无覆膜土壤相比分别降低7.8%~57.0%和2.2%~52.8%;玉米拔节期后期、抽穗期和成熟期,横垄覆膜土壤净氮矿化量比无覆膜土壤分别提高352.9%~703.3%,52.5%~311.0%和15.2%~334.8%。横垄覆膜土壤净氮矿化量在玉米苗期、拔节期、抽穗期和成熟期与土壤含水量、温度和全氮间均存在较强度关联关系(0.6灰色关联度≤0.8)。逐步回归分析表明,横垄覆膜土壤净氮矿化量在玉米苗期与土壤温度间呈最优线性关系(F=7.205,P=0.023);在玉米拔节期与土壤含水量和温度间呈最优线性关系(F=36.861,P=0.001);在玉米成熟期与土壤含水量间呈最优线性关系(F=42.438,P=0.007)。
[Abstract]:The effect of mulching on net nitrogen mineralization in Wulongchi small watershed of Danjiangkou reservoir area was studied by in-situ mineralization experiment and compared with mulching soil without mulching. The results showed that the net nitrogen mineralization of mulching soil decreased by 7.87.0% and 2.2cm 52.8%, respectively, at late jointing stage, heading stage and ripening stage, compared with non-mulching soil, respectively, in maize seedling stage and early jointing stage, the amount of net nitrogen mineralization in cross-ridge mulching soil decreased by 7.87.0% and 2.2cm 52.8%, respectively, in late jointing stage, heading stage and mature stage. The amount of net nitrogen mineralization in the mulched soil was 352.9% higher than that in the non-mulched soil, and 52.5% and 334.8% higher than that in the non-mulching soil. There was a strong correlation between net nitrogen mineralization and soil water content, temperature and total nitrogen in maize seedling, jointing, heading and ripening stages. Stepwise regression analysis showed that The linear relationship of net nitrogen mineralization between maize seedling stage and soil temperature was found in cross ridge mulching film mulching soil, the linear relationship between soil moisture content and soil water content and temperature at jointing stage was optimal, and the linear relationship between maize ripening stage and soil water content was best, and the linear relationship between F ~ (2 +) and soil water content was 0. 007% in maize jointing stage, F ~ (36. 861) P ~ (1 +) P ~ (1 +), and (2) F ~ (2 +) ~ (2 +) -4 ~ (2. 438) P ~ (2 +) P ~ (2 +) in maize.
【作者单位】：湖北大学资源环境学院/区域开发与环境响应湖北省重点实验室;
【基金】：国家自然科学基金项目“垄作覆膜对土壤无机氮流失过程的影响机理”(41471227) 湖北省自然科学基金项目“丹江口库区土地利用变化对营养盐输出影响研究”(2016CFB201)
【分类号】：S153

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