三峡库区农桑配置对地表氮磷流失的影响

发布时间：2018-02-28 09:12

本文关键词： 农桑配置氮磷流失地表径流紫色土三峡库区　出处：《土壤学报》2016年01期 　论文类型：期刊论文

【摘要】：为优化三峡库区紫色土旱坡地农桑配置方式,提高库区水土保持效果和生态环境效益,本试验通过采用三带等高桑+等高耕作、三带等高桑+交叉耕作、两带等高桑+等高耕作、两带等高桑+交叉耕作、传统等高耕作等5种处理研究了不同农桑配置方式对旱坡地地表氮磷流失的阻抗效果。结果表明,农桑配置方式能够显著阻抗地表径流和氮磷流失,但不同配置方式间存在显著性差异;三带等高桑+交叉耕作方式较其他方式能更显著地降低地表径流中全氮(磷)、可溶性氮(磷)、颗粒态氮(磷)的流失和氮(磷)年流失负荷量,地表径流中氮、磷流失分别以可溶性氮(约50.1%~60.2%)和颗粒态磷(约54.9%~59.6%)为主,并且硝态氮的年流失负荷(约0.19~0.27kg hm-2 a-1)高于铵态氮(约0.12~0.17 kg hm-2 a-1)。综上可知,三带等高桑+交叉耕作对地表径流和氮、磷流失的阻抗效果更显著,最符合三峡库区旱坡地开发利用的生态保护理念。
[Abstract]:In order to optimize the agriculture and mulberry collocation of the purple soil in the three Gorges Reservoir area and to improve the soil and water conservation effect and the ecological environment benefit, the experiment adopted three zones of equal height mulberry cultivation and three belt equal height mulberry cross tillage. The impedance effects of different mulberry configurations on nitrogen and phosphorus loss in dry sloping land were studied by five treatments, such as two zones of equal height mulberry cultivation, two belt equal height mulberry cross tillage and traditional equal height tillage. The agriculture and mulberry allocation patterns could significantly impedance surface runoff and nitrogen and phosphorus loss, but there were significant differences among different allocation methods. The total nitrogen (P), soluble nitrogen (P), particulate nitrogen (P) loss and annual nitrogen (P) loss load in surface runoff were significantly decreased by the three belt isobaric mulberry cross tillage, and the nitrogen in surface runoff was decreased. The phosphorus loss was mainly soluble nitrogen (about 50.1) and granular phosphorus (54.9%), and the annual loss load of nitrate nitrogen (0.19 ~ 0.27 kg hm-2 ~ (-1)) was higher than that of ammonium nitrogen (0.12 ~ 0.17 kg / a ~ (-1)). The impedance effect of phosphorus loss is more obvious, which is most in line with the ecological protection idea of the exploitation and utilization of dry sloping land in the three Gorges Reservoir area.
【作者单位】：西南大学资源环境学院;
【基金】：国家科技支撑计划项目(2012BAD15B04-3) 中央高校基本科研业务费项目(XDJK2013A016)资助~~
【分类号】：S157.2

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