废弃地复垦土壤重金属空间格局及其与复垦措施的关系
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国家自然科学基金项目(41471186、41571217)和国家重点研发计划项目(2016YFD0300801)


Spatial Pattern of Heavy Metal in Reclaimed Soil of Wasteland and Its Relationship to Reclamation Measures
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    摘要:

    基于经典统计学、变异函数理论以及经验贝叶斯克里格法,以西南地区某历史遗留硫磺矿废弃地为研究对象,从点与区域两方面系统分析其复垦土壤重金属空间分布特征,揭示其与复垦措施的量化关系。结果表明,经典统计学、变异函数理论以及经验贝叶斯克里格法相结合方法用于揭示硫磺矿废弃地复垦土壤重金属空间分布格局是可行和科学的。该硫磺矿废弃地复垦土地的5种土壤重金属的变异系数均较大,这与复垦土壤无序、易变以及空间均匀性和突变性统一的特征相符合。土壤重金属富集系数均在2以上。在历史矿山开采、复垦措施和地形地貌的共同作用下,不同土壤重金属在全局空间上具有一定的相似,在南北和东西方向均基本呈现两头低和中间高的倒U字形趋势。绝大多数复垦土壤重金属的块基比在50%,复垦过程中覆土、培肥和土壤pH值调节措施等随机因素在各重金属的空间变异中占主导作用。无论是何种重金属,一区东部、二区北部、四区西部均呈现较高的重金属含量;一区和二区西部、三区北部地区含量相对较低。复垦为林地和草地的重金属平均含量均高于耕地,对于复垦为耕地后续需进一步防控重金属污染,特别是Cd元素;随着有效土层厚度的逐渐增加,土壤重金属总体呈下降趋势。有效土层厚度在30~100cm之间土壤重金属无明显差异,建议研究区复垦覆土后有效土层厚度达到100cm以上。随着土壤pH值变小,复垦土壤重金属总体呈上升趋势,通过调控pH值来降低土壤重金属含量需要持续保证在一定范围,建议研究区pH值持续控制在7~8。

    Abstract:

    At present, the study about historical mining wasteland as the object, the spatial distribution characteristics of reclamation soil quality and the relationship between the spatial distribution characteristics of soil quality and the response to reclamation measures are rarely reported in the literature. Based on classical statistics, variation function theory and empirical Bayesian Kriging method, the southwest area of historical sulfur mining wasteland reclamation area as the research object, from two aspects of point and area, the spatial distribution characteristics of reclamation soil heavy metals were systematically analyzed, and the quantitative relationship between them and reclamation measures was revealed. The results showed that the combined method of classical statistics, geostatistics and empirical Bayesian Kriging was feasible to reveal the spatial distribution characteristics of soil heavy metals. The variation coefficients of heavy metals in the five soils were larger, which were consistent with the characteristics disorder, the variability and the spatial uniformity and the abrupt change of land reclamation. The enrichment coefficient of heavy metals in soil was more than 2. Under the interaction of mining, reclamation measures and topography interaction, the heavy metals in different soils had a certain similarity in the global space, in the northsouth and eastwest basically showed two low and high in the middle of the inverted “U” trend. The C0/(C0+C1) of most heavy metals of reclaimed soils was 50%, and the random factors, such as soil cover, soil fertility and soil pH value regulation, were dominant in the spatial variation of different heavy metals. No matter what kind of heavy metals, the eastern of the first region, the northern of the second region, and the western of the fourth region had higher heavy metal content;the western of the first and second regions, the northern of the third region was relatively low. The average content of heavy metals in forest land and grassland was higher than that of cultivated land, and the heavy metal pollution, especially the Cd, was needed to control the heavy metal pollution in the future. With the increase of the effective soil layer thickness, the heavy metals in the soil showed a decreasing trend. There was no significant difference of soil heavy metal between the effective soil layer thickness in 30~100cm, which suggested that the effective soil layer thickness of the reclaimed soil in the study area was 100cm or more. As soil pH value became smaller, the total heavy metals in reclaimed soil showed an increasing trend, but the control of pH value to reduce the content of heavy metals in soil needed to be maintained at a certain extent, the pH value of proposed study area was continuously controlled in 7 ~ 8. The research results would provide guidance on the method of quality monitoring for the reclamation of abandoned industrial and mining land, and provide a scientific basis for historical mining wasteland reclamation soil heavy metal pollution further control and management.

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张世文,周妍,罗明,周旭,崔红标,黄元仿.废弃地复垦土壤重金属空间格局及其与复垦措施的关系[J].农业机械学报,2017,48(12):237-247. ZHANG Shiwen, ZHOU Yan, LUO Ming, ZHOU Xu, CUI Hongbiao, HUANG Yuanfang. Spatial Pattern of Heavy Metal in Reclaimed Soil of Wasteland and Its Relationship to Reclamation Measures[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(12):237-247

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  • 收稿日期:2017-04-06
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  • 在线发布日期: 2017-12-10
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