泰来县耕地土壤硒含量特征及空间分布

为研究耕地中土壤硒的含量特征及空间分布,选取黑龙江省产粮大县泰来县为研究区,以多目标区域地球化学调查成果为数据基础,采用多元统计、地统计和普通克里格插值等方法分析泰来县耕地土壤硒元素含量及其空间分布特征。研究表明:1)泰来县耕地表、深层土壤硒含量均值分别为0.155和0.056mg/kg,都低于黑龙江省土壤背景值,水田硒元素含量均值在表、深层土壤中都高于旱地;2)土壤硒含量除受成土母质的影响外,还与土壤有机碳、总氮、Fe_2O_3与Al_2O_3含量以及pH等有关;3)表层土壤硒含量较高的区域主要分布在中部,根据土壤硒含量分布状况,富硒地区面积占耕地总面积的6.2%,研究区中部的六三一分厂、丰收村、六三良种场、河北村、六三二分厂、新建村、双山村、解放村和永发村等村耕地土壤硒含量较高,地累积指数表明土壤中生物毒性显著的重金属元素在研究区基本上不存在污染,可以在这些区域发展富硒农产品,以带动当地经济的发展。

Characteristics and spatial distribution of selenium content in cultivated soils of Tailai County

Study on the characteristics and spatial distribution of soil selenium in cultivated land can provide references for the development of selenium-enriched agriculture. Tailai County, a major grain-producing county in Heilongjiang Province, was selected as the study area in this study. Based on the multi-target regional geochemical survey results, the multivariate statistics, geostatistics and ordinary Kriging interpolation are used to study the selenium content and the spatial distribution characteristics of soil in Tailai County. The results show that:1) The average selenium content of topsoil and deep soil of cultivated land in Tailai County are respectively 0.155 and 0.056 mg/kg, which are lower than those of Heilongjiang Province.The average content of selenium in paddy field is higher than that in dry land in both surface and deep soil. 2) In addition to the influence of soil parent material, soil selenium content is related to soil organic carbon, total nitrogen, Fe₂O₃, Al₂O₃, pH and so on. 3) The areas with high selenium content in surface soil are mainly distributed in the middle part. According to the distribution of soil selenium content, the area of selenium-enriched area accounts for 6.2% of the total area of cultivated land. The selenium content of cultivated land in 631 Factory, Harvest Village, 63 Sanqiangye Market, Hebei Village, 632 Branch, Xinjian Village, Shuangshan Village, Jiefang Village and Yongfa Village in the middle part of the study area is relatively high, and the accumulative index shows that the heavy metal elements are basically free of pollution in the study area. Therefore, the selenium-enriched agricultural products can be developed in these areas to promote local economic development.