嵊州市土壤肥力变化及重金属空间分布特征研究

发布时间：2018-04-13 02:11

本文选题：嵊州 + 土壤肥力　；参考：《浙江农林大学》2015年硕士论文

【摘要】：基于嵊州市土壤调查(2014年)结果和此前10年(2004年)的调查及对照第二次土壤普查的结果,开展嵊州市耕地土壤肥力现状及其肥力演变研究,为嵊州市土壤肥力管理和施肥规划提供科学依据。同时,对2014年调查的土壤进行重金属含量分析,应用地统计学等方法分析土壤重金属分布的空间变异性及其原因,为土壤环境质量管理提供服务。取得以下主要研究结果:1.2014年嵊州市耕地土壤总体呈酸性,土壤平均pH为5.69;土壤有机质平均含量为37.05 g/kg;土壤全氮平均含量为1.89 g/kg;土壤速效磷平均含量为18.0 mg/kg;土壤速效钾的平均含量为102.2 mg/kg。总体上,自第二次土壤普查以来,土壤有机质含量有所上升但各地分布没有太大改变,全氮含量没有发生明显改变,速效磷、钾空间变幅大,缺钾、缺磷的状况没有改善,土壤速效钾的含量甚至有所下降。2.对土壤重金属铅、镉、硒和汞含量的分析表明大部分土壤的重金属含量处于正常范围,但不同土壤重金属元素含量的空间分布趋势不同,在整体重金属含量的空间样点中存在着明显的聚集和离散分布特征。3.相关性分析显示铅与镉和硒的相关性较强,土壤本身理化性质如pH值和有机质对大多数重金属的含量影响较大,全氮、速效磷、速效钾与重金属相关程度较低,相关性不显著。
[Abstract]:Based on the results of the soil survey in Shengzhou (2014) and the previous 10 years (2004) and the results of the second soil census, the present situation of cultivated land fertility and its fertility evolution in Shengzhou City were studied.It provides scientific basis for soil fertility management and fertilization planning in Shengzhou City.At the same time, the contents of heavy metals in the soil investigated in 2014 were analyzed, and the spatial variability of soil heavy metal distribution and its causes were analyzed by means of geostatistics, so as to provide a service for the management of soil environmental quality.The main results are as follows: 1. In 2014, the cultivated land soil in Shengzhou City was generally acidic.The average pH of soil was 5.69, the average content of soil organic matter was 37.05 g / kg, the average content of soil total nitrogen was 1.89 g / kg, the average content of available phosphorus was 18.0 mg / kg, and the average content of soil available potassium was 102.2 mg / kg.Overall, since the second soil census, the content of soil organic matter has increased, but the distribution of soil organic matter has not changed much, the total nitrogen content has not changed significantly, available phosphorus, potassium spatial variability, potassium deficiency, phosphorus deficiency situation has not improved.The content of available potassium in soil even decreased. 2. 2.The analysis of the contents of lead, cadmium, selenium and mercury in soil showed that the contents of heavy metals in most soils were in the normal range, but the spatial distribution trends of heavy metal elements in different soils were different.There are obvious aggregation and discrete distribution characteristics in the spatial sample of the whole heavy metal content.The correlation analysis showed that there was a strong correlation between lead and cadmium and selenium. The physical and chemical properties of soil such as pH value and organic matter had a great influence on the content of most heavy metals. The correlation between total nitrogen, available phosphorus and available potassium was low and the correlation was not significant.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S158;S153.6

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