海南岛土壤资源利用方向的判别分析

本文试用格网判别法,利用微型计算机对海南岛土壤资源作适宜性评价并选择其最合理的利用方向。为此,将该岛划分为4094个格网,并选用其中现实利用最成功的570个格网作为典型格网;将这些典型格网按最合理利用方式分为8个起始组;选择11个变量(即评价项目),并进行数字化。经多组逐步判别分析后,经调整的8个最终分组可视为土壤资源适宜性评价的标准。应用判别函数将一般格网归入其最适宜的组内。微型计算机自动输出该岛土壤资源合理利用方向的格网图。在此基础上,对该岛进行适宜性分区。研究表明该岛在发展热带作物、农业和林业方面具有巨大潜力。

DISCRIMINANT ANALYSIS OF SOIL UTILIZATION MODES IN HAINAN ISLAND

Soil suitability evaluation and rational utilization modes were studied. IIainan Island was divided into 4094 grids which were regarded as the soil resources units to be evaluated. Of the 4094 grids, 570 were chosen as typical ones (trained samples) and further divided into 8 groups representing the successful soil utilization modes on the Island (i.e. paddy field, upland field, forestry 1, forestry 2, tropical cropland 1,tropical cropland 2, pasture and others). 11 variables (i.e. evaluation items including altitude, Soil type humus reserves, solum thicl;ness and slope, et.c.) were selected and rcasonablely dibitized for ca,lcula.tion. Aftsr stepwise multfiple diseriminant analysis, all 11 varubles were proved effective, while 8 initial groups were further a.djust.ed to the optimum. The adjusted groups constituted soil suitability evaluation criteria. Based on discriminant funnetions, other 3464 grids were allocated into corresponding optimum groups. A rational soil utiLization map of the Islaud was output automatically by computor. In addition, a map of sail utilization regionalizatibn wets finished. On the m.ap, 7 utilizalion regions were delimitated. It is concluded that the Island possesses great. potentiality of developing tropical crops, agriculture and forestry.