黑龙江省海伦市长发镇土地质量地球化学评价及开发建议

GEOCHEMICAL EVALUATION OF LAND QUALITY AND DEVELOPMENT SUGGESTION OF LAND IN HAILUN CITY,HEILONGJIANG PROVINCE

基于海伦市长发镇1∶1万土地质量地球化学调查获得的土壤重金属元素和养分元素数据,参照土壤环境质量标准(GB15618—2018)和土地质量地球化学评价规范(DZ/T0295—2016),采用单指标评价法对研究区土壤养分和土壤环境质量进行评价,并在此基础上,将两者叠加分析,对研究区进行土地质量地球化学综合判定.结果表明:研究区内土壤养分以丰富及较丰富为主,分别占长发镇总面积的37.49%和62.22%,区内缺乏B、Mo;研究区99.94%的土地为无风险(一等),0.06%的土地为风险可控(二等),风险可控土地主要受Cd及Hg元素的影响;土地质量地球化学综合评价结果显示,研究区以一等(优质)土地为主,占评价区总面积的99.66%;研究发现长发镇富Se土地资源面积19.25 km^2,土壤中Se含量为0.4×10^-6~1.4×10^-6,平均值为0.44×10^-6;长发镇符合绿色食品产地的耕地面积138.44 km^2,占调查区耕地面积的99.84%,其中绿色富Se、绿色食品产地分别为18.53 km^2和119.91 km^2.

Based on the data of soil heavy metals and nutrients obtained from the 1∶10000 land quality geochemical survey in Changfa Town of Hailun City,referring to the Soil Environmental Quality Standard(GB15618—2018)and Code for Land Quality Geochemical Evaluation(DZ/T0295—2016),the authors use single index evaluation method to evaluate the soil nutrients and environment quality in the study area,on this basis,making a superposition analysis of the two to determine the comprehensive geochemical grades of land quality.The results show that the soil nutrients are mainly rich and relatively rich,accounting for 37.49%and 62.22%of the total area respectively,lack of B and Mo;99.94%of the land is risk-free(first grade)and 0.06%is risk-controllable(second grade)which is mainly affected by Cd and Hg.The comprehensive geochemical evaluation results of land quality indicate that the study area is dominated by first-grade(fine)land,accounting for 99.66%of the total evaluation area.The Se-rich land area in Changfa Town is 19.25 km^2,with the soil Se content of 0.4×10^-6-1.4×10^-6,averagely 0.44×10^-6.The cultivated land of 138.44 km^2,conforming to green food production area,occupies 99.84%of the survey area,among which the green Se-rich and green food production areas cover 18.53 km^2 and 119.91 km^2 respectively.