黑龙江省松嫩平原南部土壤硒元素的有效性与生态效应

Effectiveness and Ecological Effects of Soil Selenium in Southern of Songnen Plain of Heilongjiang Province

在黑龙江省松嫩平原南部农业地质调查总体综合评价项目研究基础上,以松嫩平原南部1∶25万多目标地球化学调查区为研究对象,面积约8.29km^2,采集表层土壤、深层土壤、典型农作物(玉米、水稻、大豆)及对应根系土壤样品,进行硒元素的测试分析,并对分析结果信息进行系统处理研究,查明研究区内硒元素地球化学特征,对其在土壤中的有效性进行了分析阐述,并对硒元素的生态地球化学效应进行了综合评价。结果表明:松嫩平原南部表层土壤中硒含量为0.204mg·kg^(-1),达到了中等程度,在全国硒的地球化学分带中,处于低硒带分布区。大豆中硒元素的平均含量较高,反映大豆对土壤中硒元素的利用程度较高。玉米中硒平均含量最低,反应玉米对硒元素的吸收利用程度较差。松嫩平原南部地区居民硒摄入量处于极低水平,93%的居民硒摄入水平处于安全线以下,约53.5%人群处于缺硒状态。

Based on the research project of comprehensive evaluation for agricultural geological survey in south‐ern of Songnen Plain in Heilongjiang Province ,taking 1∶250 000 target geochemical survey area for the study of southern of Songnen Plain as research object ,the area about 8 .29 km2 ,collecting surface soil ,deep soil ,typical crops （maize ,rice ,soybean） and the corresponding root zone soil samples ,selenium element test was analyzed to identify geochemical characteristics of selenium in study area ,its soil effectiveness was described ,the geo‐chemical and ecological effects of selenium were comprehensively evaluated .The results showed that the sele‐nium content of surface soils in southern of Songnen Plain was 0 .204 mg·kg‐1 ,reached a moderate level ,it was low selenium zonation .Average selenium content of soybean was higher ,reflecting its utilization degree was higher .Average selenium content of maize was the lowest ,reflecting its utilization degree was poor .The sele‐nium intake of resident in southern of Songnen Plain was very low level ,selenium intake of 93% of residents was in the following security level ,that of approximately 53 .5% were lack .