基于最优分割理论的土壤水分有效性评价

为解决应用土壤水分特征曲线评价土壤水分有效性研究中评价能力不足的问题，采用有序样本最优分割理论对土壤水分特征曲线进行最优分割，并引入最优分割聚类中心值作为土壤水分有效性的评价指标，构建土壤水分有效性投影寻踪评价模型。采用该方法对贵州省11个主要烟区33个土壤样本进行评价，并与以土壤物理性质为指标的常规评价方法进行比较。结果表明，所选取的评价指标能客观地反映植烟土壤水分状况，以该指标为依据做出的评价结果更加 全面。

Evaluation on soil water validity using optimum partitioning clustering method

For promoting the insufficiency in evaluating soil water availability (SWA) through soil water characteristic curve, soil water characteristic curves were partitioned by means of optimum partitioning clustering theory and clustering centre values were selected as evaluation indices. A projection pursuit evaluation model was constructed to evaluate soil water validity of 33 soil samples taken from 11 main tobacco-growing areas in Guizhou Province, China. The results were compared with those of conventional method by using soil physical properties as evaluation indices. The results showed that the selected indices could reflect soil water regime of tobacco field, and the results of the evaluation according to the indices were more comprehensive than those from conventional method.