宁夏中部干旱带压砂砾石矿质元素淋溶规律  

Leaching regularity of mineral elements of mulched gravel in arid zone of central Ningxia

作　　者：王洁 李王成[1,2,3] 董亚萍 赵广兴 徐天渊 WANG Jie;LI Wangcheng;DONG Yaping;ZHAO Guangxing;XU Tianyuan(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia,Yinchuan 750021,China;Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ministry of Education,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,银川750021 [3]旱区现代农业水资源高效利用教育部工程研究中心,银川750021

出　　处：《东北农业大学学报》2021年第2期60-69,共10页Journal of Northeast Agricultural University

基　　金：国家自然科学基金项目(51869023);宁夏高等学校一流学科建设(水利工程学科)资助项目(NXYLXK2017A03);宁夏自治区级青年拔尖人才项目(030103030008);宁夏大学研究生创新项目(GIP2020067)。

摘　　要：压砂地中"砾石-土壤-作物"三者之间存在相辅相成关系,砾石经历冻融、干湿等风化作用向土壤中淋溶释放一定量元素。为明确压砂砾石元素在干湿冻融循环作用中淋溶规律及释放机理,采用不同盐分浓度溶液对不同粒径开展干湿冻融循环试验。结果表明,随循环次数增加,各元素淋溶量呈先增后减趋势;大量元素与微量元素淋溶量峰值分别出现在60次和40次;盐分浓度增大可促进Ca、K、P、Fe、S元素释放;元素迁移能力与溶解度关系密切。There was a mutually reinforcing relationship between"gravel,soil and crops"in the gravel-mulched land.Under the weathering effects of freezing and thawing,dry and wet,gravel releases a certain amount of elements into the soil.In order to clarify the leaching rule and release mechanism of compacted sand and gravel elements into soil during the dry-wet freeze-thaw cycle,the dry-wet freeze-thaw cycle tests of different particle sizes with different salt concentrations were carried out.The results showed that the leaching amount of each element increased firstly and then decreased with the increase of the number of cycles.The leaching peaks of large amount of elements and trace elements were 60 and 40 times,respectively.The increase of salt concentration could promote the release of Ca,K,P,Fe and S elements.The migration ability of elements had a great relationship with solubility.

关 键 词：压砂砾石 干湿冻融循环 矿质元素 迁移累积系数 

分 类 号：S271[农业科学—农业水土工程]