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

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 km2，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 km2，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 km2和119.91 km2.

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

Based on the data of soil heavy metals and nutrients obtained from the 1:10 000 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 km², 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 km², 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 km² and 119.91 km² respectively.