典型富硒农业基地土壤硒的生物有效性与剖面分布分析

发布时间：2019-06-12 17:41

【摘要】：以山东省淄博市博山区富硒农业用地作为研究区域,从典型农业用地中采取土壤剖面样品,测定土壤总硒、有效硒、土壤理化性质、土壤中重金属等指标,对土壤中总硒和有效硒的土壤剖面分布并结合空间差异和水系进行分析.结果表明,博山区表层土壤(0—10 cm)总硒范围为0.080—1.290 mg·kg~(-1),均值为0.360 mg·kg~(-1),略高于全国土壤硒元素的平均值(0.290 mg·kg~(-1)).土壤有效硒均值为0.033 mg·kg~(-1),占总硒比例为10.16%.土壤中全硒含量在剖面上的分布呈现出上高下低的规律,土壤中有效硒在土壤剖面表现出上高下低、上低下高、上下相近等3种趋势.土壤母质中硒含量的高低是影响区域富硒水平的一个重要因素.研究区内硒元素和重金属镉呈极显著相关,土壤硒可能与土壤中重金属存在伴生作用.目前关于有效硒含量分级标准仍需要探讨,发展富硒农业需要构建有效硒评价体系,全面综合考虑土壤中全硒和有效硒.
[Abstract]:Taking the selenium-rich agricultural land in the Boshan District of Zibo City, Shandong Province as the research area, the soil profile samples were taken from the typical agricultural land, and the indexes such as total selenium, effective selenium, physical and chemical properties of the soil and heavy metal in the soil were measured. The soil profile distribution of the total selenium and the effective selenium in the soil was analyzed and the spatial difference and the water system were analyzed. The results showed that the total selenium content of the surface soil (0 to 10 cm) in the mountainous area was 0.080 mg 路 kg ~ (-1), the mean value was 0.360 mg 路 kg ~ (-1), which was slightly higher than that of the national soil selenium element (0.290 mg 路 kg ~ (-1)). The mean value of effective selenium in soil was 0.033 mg 路 kg ~ (-1), accounting for 10.16% of total selenium. The distribution of the total selenium content in the soil shows that the distribution of the total selenium content in the soil shows that the upper and lower levels of the soil are low, and the effective selenium in the soil shows up and down in the soil profile, and the upper and lower levels are similar to the other three trends. The content of selenium in the soil is an important factor that affects the selenium level in the region. The selenium element and the heavy metal selenium in the study area are highly correlated, and the soil selenium may be associated with the heavy metal in the soil. At present, the effective selenium content classification standard still needs to be discussed, the development of the selenium-rich agriculture needs to build an effective selenium evaluation system, and the whole selenium and the effective selenium in the soil are comprehensively considered.
【作者单位】：中国科学院生态环境研究中心城市与区域生态国家重点实验室;中国科学院大学;中国农业大学资源与环境学院;山东省淄博市博山区农业综合开发办公室;
【基金】：国家自然科学基金(41671483) 国家重点基础性科技专项(2013FY111100-02) 公益性行业(农业)科研专项(201303106)资助~~
【分类号】：S153.6

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