辽宁南部地区土壤地球化学特征及评价

GEOCHEMISTRY AND EVALUATION OF THE SOIL IN SOUTHERN LIAONING PROVINCE

依据辽宁南部(大连—营口)地区土壤地球化学调查数据,统计了53种元素的地球化学参数,说明了元素在土壤中的变化规律,对元素含量特征进行了比较归纳.辽宁南部土壤中各元素含量与中国土壤(A层)值相比,变化不是十分显著,相对稳定.研究了元素含量在不同土壤类型中的分配、分布特征,认为土壤的成土母质是影响元素含量的重要因素.评价了重金属元素对土壤环境质量的影响.辽宁南部地区土壤地球化学综合质量整体状况良好:一等和二等(无风险,优先保护类)土壤面积较大,为19486 km^2,占全区96.37%;三等(风险可控,安全利用类)土壤为648 km^2,占3.2%;五等(风险较高,严格管控类)土壤为86 km^2,仅占0.43%.良好的土壤环境质量为农业生产和土地规划利用提供了可靠的地球化学依据,为该地区土壤生态地球化学研究提供了依据和新的认识.

According to the soil geochemical survey data in Dalian-Yingkou area,southern Liaoning Province,the geochemical parameters of 53 elements are counted,which shows the change rules of elements in soil,and the content characteristics of elements are compared and summarized.Compared with the value of Chinese soil(layer A),each element content in the soil of southern Liaoning is relatively stable.The study on the distribution and characteristics of element content in different soil types indicates that the soil parent material is an important factor affecting element content.The effects of heavy metals on soil environmental quality are also evaluated.The comprehensive quality of soil geochemistry in southern Liaoning is good as a whole:The first and second class(risk-free,priority protection)soils cover a large area of 19486 km^2,accounting for 96.37% of the total area;the third class(risk-controllable,safe utilization)soil,648 km^2,3.2%;while the fifth class(high risk,strict control)soil,86 km^2,only 0.43%.Good soil environmental quality provides reliable geochemical basis for agricultural production and land planning and utilization,and new understanding for the study of soil eco-geochemistry in the area as well.