【摘要】 根据现有土地评价数据库,在分析土地潜力同土地各因素关系的基础上,建立了与其关系的综合模型,研究了利用土壤信息系统评价土地潜力。从得到的土地潜力图同野外调查土地潜力图的对比来看,利用这种模型进行的计算机土地评价制图的总趋势同野外土地评价结果相似,但在极端条件下有一定差别。这种差别主要是由土地因素同土地潜力级别的关系的非线性或抛物线型所决定的。土地评价结果同野外土地评价结果有很好的相关性(R~2=0.80),评价的平均差为半个级别。更多还原

【Abstract】 The relationships between land capability classes(for Agriculture)(LCA)and land compo- nents were studied and a model of land capability classes were built with several important land compo- nents,such as annual rainfall,growth season length(days).yearly soil moisture deficiency,soil drainage condition,soil pH.organic matter content(%)and slope,Computer aided land evaluation map was gotten by the emerging of the model and soil information system.By compareing the conventional LCA map with computer aided LCA map,the following two conclusions could be obtained:①Two maps have a similar trend,from east coast to west coast area.LCA classes increased.Two LCAs have a very close relation- ships(R~2=0.80).The average standard error for computer-aided LCA map is 0.5.e,c,a half degree of LCA in converntaional land evaluation.②The differences in the two maps are evidential.In east coast LCA are lower or higher in computer aided LCA map than conventional one.In the west coast area it is al- most all higher in the computer-aided LCA than conventional one.the differences were caused by the vari- ance of the model from linear relationship.The 7th degree of land was divided into several degrees,7,8, 9 degrees in the computer-aided LCA map.If we could use more single component’ s relationships with LCA and computer model distinguish technique in the processes,the computer aided land evaluation result could be improved.更多还原