乌鲁木齐市某蔬菜基地富硒土壤地球化学特征及生物效应研究

Study on Geochemical Characteristics and Bioeffects of Selenium-rich Soil in a Vegetable Base in Urumqi,Xinjiang

对乌鲁木齐市某蔬菜基地富硒土壤地球化学特征及生物效应分析可知,以硒含量大于等于0.4 mg/kg标准圈定富硒土壤面积约52.89 km^2,硒含量均值为0.78 mg/kg;富硒土壤中重金属元素含量较低,养分元素含量适量丰富,农作物富硒效应较好,安全性较高。通过对土壤中硒元素赋存状态分析,发现区内土壤中存在大量土壤缓效硒,潜在供硒能力较强,且对植物吸收有利的有效硒占比达4.02%;土壤中硒的有效性不仅取决于总硒的含量,还与土壤pH、有机质等有一定关系;农作物中硒的含量水平可能受土壤中有效硒、总硒、有机质、pH等多个因素综合影响。

Through the analysis of the geochemical characteristics and bioeffects of selenium- rich soil in a vegetable base in Urumqi, the area of selenium-rich soil is about 52.89km^2 with a selenium content of 0.4mg/kg or more, and the average selenium content is 0.78mg/kg. The content of heavy metal elements in the selenium-enriched soil is lower, and the content of nutrient elements is moderate-rich. The selenium-enriching effect of crops is better and the safety is higher. Through the analysis of the occurrence of selenium in the soil, it is found that there is a large amount of soil slow-acting selenium in the soil, and the potential for selenium is strong, and the effective Se ratio for plant absorption is 4.02%;the effectiveness of Se in soil It not only depends on the total Se content, but also has a certain relationship with soil PH and organic matter. The content of Se in crops may be affected by many factors such as effective Se, total Se, organic matter and PH in the soil.