基于RS和GIS的都匀茶树种植地质背景调查

Research on the geological background of tea planting in Duyun City based on RS and GIS

为调查都匀茶树种植的地质背景,以农业地质学理论为基础,借助遥感(remote sensing,RS)与地理信息系统(geographic information system,GIS)技术,高效快速地分析研究了地质背景与优质都匀茶树种植的关系。首先,利用Sentinel-2A和Landsat8等遥感影像,采用面向对象的分类方法,结合自定义的茶树提取指数和茶树物候信息,实现了茶树种植区的高精度提取;然后,利用GIS的空间分析功能,精确统计各地质背景在都匀市的分布以及不同背景上茶树种植面积,对都匀茶树种植区的地质背景作了全面调查;最后,测试分析采样数据讨论不同背景岩石的地球化学特征,并编制了都匀茶树种植地质背景适宜区规划图。研究表明,都匀碎屑岩所含化学元素明显优于碳酸盐岩,碎屑岩是茶树种植的优势地质背景,其分布面积在都匀市占比高达47. 86%,为各种岩性中所占比例最大,其次是白云岩,占比16. 80%;都匀茶树种植67. 82%分布于碎屑岩背景,这是当地出好茶的基本条件。研究结果可为发展地方经济,指导茶叶种植规划提供科学依据。

To investigate the geological background of Duyun tea planting,the authors studied the relationship between geological background and high quality Duyun tea planting efficiently and rapidly based on the theory of agricultural geology and using RS and GIS technology.Firstly,by using Sentinel-2A and Landsat8 remote sensing images and object-oriented classification method in combination with customized TEI and tea phenology information,high-precision extraction of tea planting areas was realized.Then,the spatial analysis function of GIS was used to count the distribution of various geological backgrounds in Duyun and the area of tea planting on different backgrounds accurately,and the geological background of tea planting in Duyun was investigated comprehensively.Lastly,the geochemical characteristics of rocks with different backgrounds were investigated by testing and analyzing the sampled data,and the planting map of suitable geological background area for tea planting in Duyun was compiled.The results show that the chemical elements in Duyun clastic rocks are obviously better than those in carbonate rocks.Clastic rocks are the advantageous geological background for tea planting and the important influencing factors for Duyun to produce high quality tea.The distribution area of clastic rocks accounts for 47.86%of the total area of Duyun,which means that clastic rocks possess the largest proportion of all lithologies,followed by dolomite,which accounts for 16.80%.67.82%of Duyun tea is planted in clastic rock background,which is the basic condition for local tea production.