土地质量地球化学评价方法研究与应用：以黑龙江省宏胜镇为例
The Study and Application of Land Quality Geochemical Evaluation Method: Illustrated by the Case of Hongsheng Town, Heilongjiang Province

摘要： 为进一步加强土地质量地球化学评价成果的应用性，本评价方法以土地利用现状图斑为评价单元，采用网格化布设土壤采样点，网度为400 m×400 m，采样深度为0 ~ 20 cm。分析了土壤样品中N、P、K、As、Se等16项元素指标。参考《土地质量地球化学评价规范》对黑龙江省宏胜镇农耕区土地质量进行了地球化学评价。结果显示：宏胜镇农耕区土地环境综合质量状况优质，达到一等环境质量的耕地面积占9930%；养分综合质量丰富以上的土地占9403%。同时经过本次评价进一步发现了8105 km2的珍贵富硒土地资源，土壤硒含量在04~101 mg/kg之间。
Abstract: In order to strengthen the application of achievements of land quality geochemical evaluation, the work took polygons of current land use as the evaluation unit, arranged soil samples in grid by 400×400 meters whose the depth is between 0 to 20 centimeters. Sixteen elements were analyzed, including N, P, K, As, Se, etc. The geochemical quality of cultivated land in Hongsheng Town in Heilongjiang was evaluated referring to the Determination of Land Quality Geochemical Evaluation. The results show that the geochemical comprehensive grade of cultivated land soil quality in Hongsheng Town is “premium”. 9930 percent of the study area reaches the first grade of environmental quality and more than 9403 percent reaches the abundant grade of comprehensive nutrients quality. Furthermore, precious seleniumrich land resources of 8105 km2 were found, whose concentration of Se ranges from 04 to 101 mg/kg