关键词: 红壤, 钼, 硼, 硒, 牧草, 生长

Abstract: According to the growth requirements of lichee to ecological and climatic conditions, the adaptability indices of climatic regionalization for lichee planting were analyzed and determined. A spatial analytical model of the regionalization indices was established by statistical methods, and the regionalization indices were reckoned on refined grids of 500 m×500 m by -using 1∶250000 landform data. Based on the principles of spatial interpolation technique for discrete points, the remnant differences were interpolated to each spatial point. Through superposing the interpolation and reckon results, the refinement of regionalization indices on spatial distribution was realized. The land use information was picked up from ETM  satellite data, and, joining with 3Stechnique, the ecological climate regionalization was done for lichee optimal distribution. According to the climatic adaptability for lichee planting and the land use status, Nanning City of Guangxi was divided into optimal, suitable, sub-suitable, and unsuitable climatic regions, and the 3-dimensional stereo thematic map on refined grids was drawn. Each kind of the regions was remarked, and planting suggestions were proposed. This study could provide scientific basis to the adjustment of agricultural structure and the optimal distribution of lichee planting in Nanning City.

Key words: Red soil, Molybdenum, Boron, Selenium, Forage grass, Grass growth