Factors Influencing Runoff P Losses from Farmlands of the Dianchi Lake Watershed in Yunnan,China

ZHANG Nai-Ming; YU Yang; HONG Bo; CHEN Jian-Jun; ZHANG Yu-Juan

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Factors Influencing Runoff P Losses from Farmlands of the Dianchi Lake Watershed in Yunnan,China

机译：云南滇池流域农田径流磷损失的影响因素

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Effects of factors such as slope,surface soil texture,fertilization and crop cover with different rainfall intensities on phosphorus (P) losses in farmland runoff of the Dianchi Lake Watershed in Yunnan Province of China were studied through a rainfall simulation test using a red soil,one of the most widely distributed soils of the study area. Results showed that the runoff concentrations of total phosphorus (TP) and P losses differed with the slope,being highest when the slope was 18°. At two different rainfall intensities,the runoff TP and P losses had a similar decreasing trend as the surface soil texture became coarser,therefore applying the grit would decrease P in runoff from soils of farmland on slopes with heavier textures. With wheat as a crop cover the runoff TP concentrations and P losses were significantly lower than those of the bare soil. This showed that plant cover would greatly decrease P in runoff from the farmland of the study area. The TP concentration in runoff from the soil two days after fertilization doubled when compared with that from the non-fertilized soil,indicating that fertilization could mean a dramatic rise in P runoff if irrigation or heavy rainfall occurred immediately after application and that no fertilization before a rain and no irrigation immediately after fertilization would reduce runoff P loss from the farmland of the study area.

机译：通过使用红壤的降雨模拟试验，研究了云南滇池流域耕地径流中坡度，表面土壤质地，施肥和不同降雨强度的作物覆盖等因素对磷流失的影响，研究区域分布最广的土壤之一。结果表明，径流总磷和磷流失浓度随坡度的不同而不同，坡度为18°时最高。在两种不同的降雨强度下，随着表层土壤质地的变粗，径流TP和P的损失也有相似的下降趋势，因此，应用粗砂会使质地较重的斜坡上的农田土壤的径流中的P减少。以小麦作为农作物，径流中的总磷浓度和磷素损失明显低于裸土。这表明植物覆盖将大大减少研究区农田的径流中的磷。施肥后两天土壤中的径流TP浓度比未施肥土壤中的TP浓度翻了一番，这表明如果施肥后立即发生灌溉或暴雨，施肥可能意味着磷径流急剧增加，并且在施肥前不施肥施肥后立即降雨和不灌溉将减少研究区域农田的径流磷损失。

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来源
《土壤圈（英文版）》 |2004年第2期|259-262|共4页
作者
ZHANG Nai-Ming; YU Yang; HONG Bo; CHEN Jian-Jun; ZHANG Yu-Juan;
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作者单位

College of Resources and Environmental Science,Yunnan Agricultural University,Yunnan,650201,China;

College of Resources and Environmental Science,Yunnan Agricultural University,Yunnan,650201,China;

College of Resources and Environmental Science,Yunnan Agricultural University,Yunnan,650201,China;

College of Resources and Environmental Science,Yunnan Agricultural University,Yunnan,650201,China;

College of Resources and Environmental Science,Yunnan Agricultural University,Yunnan,650201,China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
non-point source (NPS) pollution; phosphorus; runoff;

机译：面源污染;磷;径流;

Factors Influencing Runoff P Losses from Farmlands of the Dianchi Lake Watershed in Yunnan,China

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