基于最小数据集的宜章植烟土壤综合肥力评价

Comprehensive Fertility Evaluation of Tobacco-planting Soil in Yizhang Based on Minimum Data Set

采用主成分分析和相关性分析方法,构建了由土壤有机质、全磷、pH值、交换性钙、有效钼、有效锰、有效硫、水溶性氯等组成土壤肥力评价的最小数据集(MDS),综合分析了湖南宜章烤烟产值与土壤质量的关系,探究了制约烤烟产质量的土壤因素,并提出了土壤保育和肥力提升技术措施。结果表明,全数据集的土壤肥力指数(TDS-IFI)与最小数据集的土壤肥力指数(MDS-IFI)之间呈显著正相关,R2达到0.6332。TDS-IFI介于0.451~0.756之间,均值为0.591;MDS-IFI介于0.444~0.734之间,均值为0.565,表明宜章烤烟区的土壤肥力属于中等。土壤pH值偏中性和弱碱性,有机质和碱解氮含量相对较高,有效铜、有效铁和水溶性氯含量较适宜,而有效硫和有效锰含量较低。

The minimum data set(MDS)for soil fertility assessment consisting of the contents of organic matter,total phosphorus,exchangeable calcium,effective molybdenum,effective manganese,effective sulfur,water-soluble chlorine and pH was constructed by correlation analysis and principal component analysis.The relationship between the output value of flue-cured tobacco in the area and soil quality was comprehensively analyzed.The soil obstacle factors that restricted yield and quality of flue-cured tobacco were identified,and corresponding technical measures for soil conservation and fertility improvement were proposed.The results showed that the soil fertility index of the total data set(MDS-IFI)and the soil fertility index of the minimum data set(MDS-IFI)were significantly positively correlated,R2 was 0.6332.TDS-IFI was from 0.451 to 0.756,with an average of 0.591.MDS-IFI was from 0.444 to 0.734,with an average of 0.565,which indicated that soil fertility in Yizhang tobacco-growing area was moderate.Among them,pH was mostly neutral and weakly alkaline,and organic matter and alkaline nitrogen content were relatively high.The content of available copper,available iron and water-soluble chlorine was suitable,while available sulfur and available manganese were relatively low.