| 张德明,骆珊,彭成龙,安亚运,李月森,跃连红,秦兴志.乌蒙山区富硒耕地土壤资源评价与分析——以贵州省大方县为例[J].贵州地质,2020,37(3):281-288 |
| 乌蒙山区富硒耕地土壤资源评价与分析——以贵州省大方县为例 |
| Evaluation and Analysis of Selenium-rich Cultivated Land Soil Resource in Wumeng Mountain Area——A Case Study of Dafang County of Guizhou Province |
| 投稿时间：2020-04-15 |
| DOI： |
| 中文关键词: 富硒土壤 评价与分析 环境质量 养分质量 大方县 |
| 英文关键词:Selenium-rich Cultivated Land Soil Evaluation and Analysis Environmental quality Nutrient quality Dafang county |
| 基金项目:贵州省自然资源厅项目“贵州省大方县耕地质量地球化学调查评价”(黔地矿耕调2017-34)资助。 |
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| 中文摘要: |
| 通过1∶50000耕地质量地球化学调查，获得了乌蒙山区大方县耕地土壤、农产品中元素的高精度分析数据。统计发现，大方县耕地土壤中硒元素平均含量为074 mg/kg，硒高含量区与县内二叠系成土母岩、黄棕壤-黄壤、中-酸性土壤等分布紧密相关。评价结果显示大方县耕地土壤酸碱性环境以中-酸性为主，占比8504%；富硒耕地土壤面积1 13775 km2，占比9052%；富硒耕地土壤环境质量优先保护类-安全利用类占比8484%，富硒耕地土壤养分质量丰富-较丰富等级占比7069%，共同表明全县富硒耕地具环境质量优越、养分条件好、总量大和分布广的优势。不同农产品对硒的富集程度受土壤酸碱性环境和有机质含量丰缺的影响显著，可通过土壤酸碱度适宜改良和增施有机肥等调配好土壤pH值和有机质的含量，大力提升农产品的绿色、富硒品质。因此，本研究系统对富硒耕地土壤资源进行地球化学评价和分析，为大方县及乌蒙山集中连片贫困区开发富硒耕地资源和发展特色农业产业提供依据具有重要意义。 |
| 英文摘要: |
| The high precision analysis data of elements in soil and agricultural products of Dafang county in Wumeng Mountain area were obtained through 1∶50000 geochemical investigation and evaluation of cultivated land quality.According to the statistics, the average Selenium content of cultivated land soil in the study area is 0.74 mg/kg.The high selenium content area is closely related to the distribution of Permian soil, yellow brown soil, yellow soil and medium acid soil.Evaluation results show that the selenium-rich cultivated land was 1 13775 square kilometers, accounting for 90.52%,the acid and alkaline environment of soil is mainly neutral to acidic.the proportion of priority protection and safe utilization of soil environmental quality of selenium-rich cultivated land reached 84.84%,and the proportion of soil nutrient quality and abundance in selenium-rich cultivated land was 70.69%,which reflects that the selenium-rich cultivated land has the advantages of superior environmental quality, good nutrient conditions, large amount and wide distribution.The enrichment degree of selenium of different agricultural products is significantly affected by the acidity and alkalinity environment of soil as well as the abundance and deficiency of organic matter content. Therefore, the soil pH value and organic matter content can be well adjusted through the appropriate improvement of soil acidity and alkalinity and the application of organic fertilizer, so as to greatly improve the green and selenium-rich quality of agricultural products.Therefore, it is of great significance to systematically evaluate and analyze the soil resources of selenium-rich cultivated land, so as to provide a basis for the development of selenium-rich cultivated land resources and characteristic agricultural industry in the research area and the contiguous poor areas in Wumeng Mountain. |
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