中文摘要：

耕地地力评价指标选取的主导性、独立性原则在实践中不易落实；耕地地力评价试图应用到多尺度空间，却没有适应不同时空尺度的明确任务定位，从而很少考虑评价指标选择的尺度适应性。本文运用地学、农学、系统科学的观点，建立了针对上述问题的分析逻辑，认为：第一，耕地地力评价的任务、评价技术路线和评价指标对地力的指示意义均具有时空尺度特征。第二，评价指标应区分为直接说明作物光、温、水、养分满足程度的指标和间接指示这些条件的指标。大空间范围的耕地地力评价以长时效，低空间精度为特征，着重表现区域地理障碍和资源约束，宜选取稳定性和间接性评价指标；小空间范围以即时状态的耕地地力评价为主，并具有较高的空间精度，评价指标应具有即时性和直接性特征。第三，土地一作物一管理条件构成土地利用系统的整体，随土地系统的作物需求、土地和管理条件的变化，评价指标对耕地地力的意义应辩证分析。第四，共同说明光、温、水、养分的某一方面性质的自然土地条件和人工土地条件应作为整体对待，综合为一个指标，而不应在评价指标体系中分割。

英文摘要：

In China, Cultivated Land Productivity Evaluation （CLPE） is carrying out cou on various scales, e.g. country, province, municipality, city and county, with the （（Technical Productivity Survey and Quality Assessment of Cultivated Lands）） （TRPSQACL） as guidance. to minimize negative effects of the modeling based on the subjective evaluation index is done in this paper on analytic logic of CLPE, so as to build up a ＂thought bridge＂ knowledge to the physical model of cultivated land productivity. CLPE is just a kind evaluation logic for b is the cate （ LCC ） Map at 1 ntry-wide Rules for In order system, discussion linking professional of land productivity （ LPE ） and the prevailing LPE methods could be used as reference in forming scientific analytic uilding a CLPE index system. LPE methods can roughly be sorted into 3 categories. The first one gory of qualitative classification and grading, such as Land Capability Classification of America Soil Fertility Capability Classification of America （ FCC ） , Chinese Land Resource Evaluation 100, 000 scale. This category of methods is used to classify and grade land resources according to the type and system. The se Soil Quality extent of obstacles in land use on cond is one of quantitative scoring Rating of Germany all spatial methods, scales, but it does not have a consi such as Storie Index Soil Rating of SQR） , etc., characterized by expl stent index America, icit index systems and scoring rules, to evaluation on small scales for the classification with scoring, such as MOSS and Agricultural Land Quality evaluated into several agricultural cally, and then calculating potential zones, for which appropriate evaluation indices are selected zone-specifi of an as hototemper d modifying the second ature or climate co the score with soil step. So they are ntributing to land productivity on the large spatial scale as the first step, conditions and site-specific environmental conditions on the small scales applicable to evaluation on all sp