土壤类型对优先流路径和磷形态影响的定量评价

发布时间：2018-03-30 15:55

本文选题：土壤　切入点：优先流路径　出处：《农业机械学报》2017年01期

【摘要】：以中国贡嘎山由青灰色砂质冰水堆积物发育而成的疏松岩性土壤和德国厄尔士山渍水土壤优先流路径为研究对象,通过野外染色示踪试验和改进的Hedley磷形态提取法,使用优先流染色面积比和优先流程度评价指数定量评价不同类型土壤的优先流程度,通过相关关系分析进一步揭示不同土壤类型中优先流路径对磷形态分布的影响。结果表明:贡嘎山和厄尔士山优先流图片总染色面积比分别为31%和52%,厄尔士山渍水土优先流比贡嘎山疏松岩性土发育较好。贡嘎山疏松岩性土壤优先流发育程度与潜在生物可利用无机磷和有机磷贡献率显著正相关,而即时生物有效无机磷和磷灰石磷与厄尔士山渍水土壤优先流发育程度显著正相关。土壤类型影响优先流路径分布和土壤磷形态分布,从而影响土壤磷赋存状况和下游水质安全。
[Abstract]:In this paper, the preferential flow path of loose lithologic soil in Gongga Mountain, China, developed from the accumulation of green-gray sandy glacial water, and the preferential flow path of waterlogging soil in Ershi Mountain, Germany, were studied. The field dyeing tracer test and the improved Hedley phosphorus form extraction method were used. First flow dyeing area ratio and priority flow degree were used to quantitatively evaluate the priority flow degree of different types of soil. The effect of preferential flow path on the distribution of phosphorus forms in different soil types was further revealed by correlation analysis. The results showed that the total dyeing area ratio of preferential flow images in Gongga Mountain and Ershi Mountain was 31% and 52%, respectively. The preferential flow of soil and water was better than that of loose rock soil in Gongga Mountain, and there was a significant positive correlation between the development of preferential flow and the contribution rate of inorganic phosphorus and organic phosphorus to potential bioavailability. However, immediate bioavailability of inorganic phosphorus and apatite phosphorus were positively correlated with the development of preferential flow of waterlogging soil in Ershi Mountain. Soil types affected the distribution of preferential flow path and the distribution of soil phosphorus forms. Therefore, the occurrence of soil phosphorus and the safety of downstream water quality are affected.
【作者单位】：中国科学院成都山地灾害与环境研究所山地表生过程与生态调控重点实验室;
【基金】：国家自然科学基金面上项目(41272200) 国家重点研发计划项目(2016YFC0502401)
【分类号】：S152.7

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