Suitability Evaluation And Zonation Of Land Resources For Main Cash Crops Cultivation In Fujian Based On GIS

Evaluation suitability of land resources for crop cultivation has been considered to go further in macroscopic land suitability evaluation, which is even more pertinence and function. It was launched to study Evaluation and zonation on main cash crops suitability of land resources in Fujian in order to perfect regional evaluation technique on cash crops suitability of land resources, reflect completely land resources for main cash crops quantity, quality and distribution in Fujian, bring forward a optimal planning on main cash crops scale and allocation in Fujian, in which planting structure was reasonable, spatial allocation was suitable, use of resources rate was high and integrated benefit was max.This study was based on GIS and mathematical model. Taking the present state of land utilization class —cultivated land as object, the unit of evaluation was 250m×250m grid. According to natural, social and economic request about peanut,flue-cured tobacco , sugarcane, it was established the factor system of suitability evaluation including climate, environment of land, the physical and chemical character of soil and social economy . digital elevation model(DEM), Trend-surface analysis, Kriging, Inverse distance weighted interpolation and t test were applied to build the spatial and attributive database of factors of suitability evaluation, fuzzy subject function, AHP model, correctional weighting-multiplication model, dynamic clustering analysis were used to assess quantity and quality on land resources for main cash crops in Fujian, based on the research on suitability evaluation, linear programming and expert assistant decision-making were adopted to zone the main cash crops in Fujian. the result was following:1. The coefficients of correlation which reflect models between atmospheric factors and longitude (λ), latitude (Φ), elevation (h) were from 0. 530 to 0. 983 (p≤0.0001), furthermore, the t values minimal between true values and values of the hereinbefore atmospheric factors which calculate by combining the Trend-surface model of two power and Inverse distance weighted interpolation of one power, twelve power, five power, seven power, six power, one power, one power, five power, twelve power, twelve power, twelve power, one power, one power, one power, twelve power , one power, the results showed that using models of interpolation upward could get the datum of atmospheric factors which have the best precision. It could respectively apply to the precise calculation of spatial datum such as yearly average rainfall, yearly accumulative temperature beyond twenty degree, yearly hours of sunlight , yearly non-frost day, average of extreme low temperature, accumulative temperature beyond ten degree from April to August, average temperature of November , average temperature from June to July, average temperature from July to August, accumulative rainfall from April to August, accumulative rainfall from June to July, accumulative rainfall from August to December, hours of sunlight from March to July , hours of sunlight from April to August, hours of sunlight from August to December , accumulative temperature beyond ten degree from August to December.2. The suitable land resources for spring peanut and flue-cured tobacco had the comparative advantage in the whole resources of cultivated land in Fujian. The total areas of suitable...