Abstract
The niche-fitness and limited factors of rice, wheat, cotton and rape in Houhu Farm area of Jianghan Plain are analyzed by weighted average model and limited factor model. The niche-fitness theory and GIS are applied to the research on multi-suitability evaluation. The high values of the niche-fitness (the maximum is 0.958) indicate that the environmental conditions basically meet the requirements of crops in the area. Suitability evaluation of single crop shows that the degrees of suitability are satisfactory. Comprehensive suitability evaluation shows that the acreage for grade 1 (highly suitable for cultivation) accounts for 18.16% of the total cultivated land area, whereas the acreage for grade 3 (critically suitable) and grade 4 (unsuitable) only for 8.9%. The main factors limiting the potential land productivity are cation exchange capacity (CEC), available phosphorus content and accessibility level of road.
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