贵州荔波县农业示范园区富硒耕地调查分析及分布特征

Investigation,Analysis and Distribution Characteristics of Selenium-rich Cultivated Land in Agricultural Demonstration Park of Libo,Guizhou

以贵州荔波县农业示范园区为研究区,网格化采样的方法共采集277件表层耕地土壤样。运用SPSS、Excel进行统计分析和AreGIS空间插值的研究方法,研究园区耕地硒含量和空间分布特征。结果表明:园区耕地土壤硒含量变化0.12~1.22mg/kg,平均值0.4mg/kg,富硒耕地为1813.67hm2,占比53.08%。主要集中分布于中至南部,时来村、山江村、建设村、板旺村、板麦村、高桥村、红光村、拉片村和菇类村。园区耕地土壤pH平均值为5.85,有机质平均值为30.05g/kg。不同土壤类型中石灰土硒含量最高0.49mg/kg,不同土地利用类型中旱地硒含量最高0.45mg/kg,不同成土母岩中碳酸盐岩及粘土岩硒含量0.42mg/kg。

Taking the agricultural demonstration park in Libo County,Guizhou Province as the research area,a total of 277 topsoil soil samples were collected by grid sampling method.Using the statistical analysis of SPSS and excel and ArcGIS spatial interpolation,the selenium content and its spatial distribution characteristics of cultivated land in the park were studied.The results showed that the variation range of soil selenium content in the park was 0.12~1.22mg/kg,with an average of 0.4mg/kg.The selenium rich cultivated land is 1813.67hm2,accounting for 53.08%of the whole park.Selenium rich cultivated land is mainly distributed in the central and southern part,including Shilai village,Shanjiang village,Jianshe village,banwang village,banmai village,Gaoqiao village,Hongguang village,lapian village and mushroom village.The average pH value of cultivated soil in the park is 5.85 and the average value of organic matter is 30.05g/kg.In different soil types,the selenium content of calcareous soil is the highest,which is 0.49mg/kg.In different land use types,the selenium content of dry land is the highest,which is 0.45mg/kg,and the selenium content of carbonate rock and clay rock in different soil forming parent rocks is 0.42mg/kg.