贵州荔波县耕地土壤质量地球化学等级划分及其分布特征

Geochemical Classification and Distribution Characteristics of Cultivated Soil Quality in Libo,Guizhou

荔波县开展1∶50000耕地采样分析后,在Arcgis平台以耕地赋值图斑为评价单元,运用地球化学元素等级划分标准,对荔波县耕地土壤质量地球化学进行评价。由耕地土壤养分综合等级、耕地土壤环境综合等级,形成耕地土壤质量地球化学综合等级。结果表明:优质耕地土壤面积为2.93万亩占9.49%;良好耕地土壤面积为4.11万亩占13.29%;中等耕地土壤面积为22.27万亩占72.11%;差等耕地土壤面积为0.25万亩占0.81%。评价区耕地土壤质量地球化学等级以中等级良好级别为主,26.38万亩,占比达85.40%。其中朝阳镇、佳荣镇、茂兰镇、小七孔镇耕地土壤质量主要以中等以上为主。

After 1∶50000 cultivated land sampling and analysis in Libo,On the platform of ArcGIS,the soil quality geochemistry of cultivated land in Libo county was evaluated by using the geochemical element classification standard,taking the cultivated land assignment map as the evaluation unit.The comprehensive grade of soil quality and geochemistry is formed by the comprehensive grade of soil nutrients and soil environment.The results show that:The high-quality cultivated soil area is 29300 mu,accounting for 9.49%,the good cultivated soil area is 41100 mu,accounting for 13.29%,the medium cultivated soil area is 222700 mu,accounting for 72.11%,the poor cultivated soil area is 25000 mu,accounting for 0.81%,the inferior cultivated soil area is 13300 mu,accounting for 4.29%.The geochemical grade of cultivated soil quality in the evaluation area is mainly good grade,263800 mu,accounting for 85.40%.The cultivated land quality of Chaoyang,Jiarong,Maolan and xiaoqikong is mainly above medium level.The inferior cultivated land in the county is mainly distributed in the south of Yaoshan Yao nationality township and the middle of Limingguan Shui nationality.