It is held critical to establish a unified national norm model, pricing technique and parameters for charges of land resources investigation and evaluation.
开展土地资源调查评价费用标准研究，制定全国统一定额模式、计价方法及相关的参数十分必要。
By taking Guiyang City as a case study, the indices for the natural ecosystem, society economy system and cropland pollution system were chosen and the land resource evaluation model was established.
以贵阳市区为例，选取自然生态系统指标、社会经济系统指标和农田污染系统指标，建立了土地资源评价模型。
Meanwhile, considering the ratio of non desertified land area and different degree desertified land area, a regional evaluation model of land desertification level was given out.
在此基础上，考虑到非荒漠化土地及各程度荒漠化土地在面积上的组成比例，给出区域性土地风蚀荒漠化总体水平评价模型；
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