穆棱河-兴凯湖平原土地质量地球化学评价

基于穆棱河-兴凯湖平原1：25万土地质量地球化学调查土壤养分元素数据，参照《土地质量地球化学评价规范》（DZ/T 0295—2016），采用单指标评价法对研究区土壤养分进行分别和综合评价.结果表明：研究区内全氮、全磷、有机质、硫、锰、钼、氧化铁以丰富—较丰富为主，全钾以三等适中为主，研究区缺乏氧化钙、氧化镁、硼、锌、铜.土壤养分综合指数显示，穆兴平原土地以丰富（一等）及较丰富（二等）为主.发现了富硒土地资源面积344 km²，土壤中硒含量在0．4×10^-6～0．79×10^-6之间，平均值为0．44×10^-6，占研究区总面积的2．07%.

GEOCHEMICAL EVALUATION OF LAND QUALITY IN MULING RIVER-XINGKAI LAKE PLAIN

Based on the soil nutrient element data of 1∶250000 land quality geochemical survey in Muling River-Xingkai Lake Plain,referring to the Code for Land Quality Geochemical Evaluation(DZ/T0295—2016),the single index evaluation method is used to evaluate the soil nutrients respectively and comprehensively in the region.The results indicate that the study area is characterized by rich or relatively rich total nitrogen,total phosphorus,organic matter,sulfur,manganese,molybdenum and iron oxide,medium(third-grade)total potassium,and deficient calcium oxide,magnesium oxide,boron,zinc and copper.The soil nutrient composite indexes show the land of Muxing Plain is mainly rich(first grade)and relatively rich(second grade).The Se-rich land area of 344 km2 is recognized,with soil Se content of 0.4×10^-6-0.79×10^-6,averagely 0.44×10^-6,accounting for 2.07%of the total area.