广西农产品产地土壤硒资源普查及分级评价研究

Investigation on soil selenium resources census in producing area of Guangxi agricultural products and graded evaluation

【目的】掌握广西农产品产地土壤硒资源状况,为各级党委政府安全利用农业硒资源,开发富硒农产品提供科学依据和技术支持。【方法】对广西14个地级市110个县(市、区)1153个乡(镇、涉农街道办)3,610,262hm2农产品产地土壤开展调查布点、采样监测与结果评价,以硒资源普查数据为依据,建立农业硒资源普查评价与开发利用管理平台,直观展示农产品产地土壤硒资源普查成果。【结果】广西农产品产地土壤硒资源普查28,568个点位平均硒含量达0.49mg/kg,是世界和全国平均水平的2.5倍和0.7倍;各地级市农产品产地土壤平均硒含量范围为0.34~0.57 mg/kg,分别是世界和全国平均水平的1.7~2.9倍和1.2~1.9倍。广西农产品产地土壤硒分级点位集中分布在富硒和足硒等级,占普查总点位的95.1%,具体分布是足硒点位13773个,占48.2%;富硒点位13404个,占46.9%;缺硒点位1371个,占4.8%;过硒点位20个,占0.1%;水田、旱地、园地富硒和足硒等级分别占各自普查总点位的95.4%、94.8%和95.1%。

【Objective】To master the situation of soil selenium resources in producing area of Guangxi agricultural products,and provide scientific basis and technical support for governments at all levels to safely utilize agricultural selenium resources and develop selenium-rich agricultural products.【Method】Carry out survey distribution points,sampling monitoring and result evaluation of 3,610,262 hm 2 producing area of Guangxi agricultural products in 1153 townships （towns,agriculture-related subdistrict office） of 110 counties （cities,districts） of 14 prefecture-level cities in Guangxi,based on the data of selenium resources census,establish the management platform of agricultural selenium resources census evaluation and the integrated development,intuitive display the results of soil selenium resources census in origin area of agricultural area.【Result】The average selenium content at 28,568 points of soil selenium resources census in producing area of Guangxi agricultural products reached 0.49mg/kg,which are 2.5 times and 0.7 times of the world and national average respectively.The average soil selenium content of agricultural products in each prefecture-level city ranges from 0.34 mg to 0.57 mg/kg,which is 1.7 to 2.9 times of the world average and 1.2 to 1.9 times of the national average.In Guangxi producing area of agricultural products,soil selenium grading points are mainly distributed in selenium-rich and full-selenium grades,accounting for 95.1% of the total points in the census.The specific distribution points are as follows：in total 13,773 full-selenium spots,accounting for 48.2%;13,404 selenium-rich spots,accounting for 46.9%;1,371 selenium deficiency spots,accounting for 4.8%;20 selenium excess spots,accounting for 0.1%;The grades of selenium-rich and full selenium of paddy field,dry land and garden land accounted for 95.4%,94.8% and 95.1% of the total points respectively.