Soil Fertility Assessment of Alisma orientale in Sichuan Based on Minimum Data Set

YANG Kefang; LI Ruirong; JIN Mengzhen; WU Lingmei; ZHOU Jixin; ZHANG Yayu

doi:10.15933/j.cnki.1004-3268.2025.01.008

Abstract：In order to establish a scientific evaluation system of soil fertility in Sichuan Province and provide a reference for soil nutrient management of Alisma orient ale,159 soil and Alisma orientale samples were collected from 53 planting bases of Alisma orientale,and the physical and chemical properties of soil and the effective components of Alisma orientale were determined.The minimum data set was constructed by principal component analysis to comprehensively evaluate the soil fertility in this area.The result showed that the cumulative contribution rate of the six principal components with eigenvalues ≥ 1 in the principal component analysis of soil fertility evaluation indexes was 82.803％,which could represent the information of most soil fertility evaluation indexes.The minimum data set was composed of soil pH value,total nitrogen,available phosphorus,total iron,total manganese and total zinc,and 68.42％of the information redundancy was removed.Based on the minimum data set,the soil quality index of Alisma orientale in Sichuan ranged from 0.26 to 0.82,with an average of 0.49,and 78％of the soil fertility at the sampling points was at a medium to high level.The soil quality indexes of the minimum data set in Jiajiang County,Wutongqiao District,Dongpo District and Pengshan County were 0.529,0.526,0.388 and 0.603,respectively.There were significant differences in soil fertility among the four regions,but the low variation intensity of soil fertility in each region was suitable for the growth of Alisma orientale.The soil fertility results of the soil quality evaluation models based on the total data set and the minimum data set were similar,and the two were significantly positively correlated and the change trend was consistent(R2=0.899),which showed that the minimum data set had a good coverage effect on the soil fertility of Alisma orientale,and could characterize the soil fertility status of Alisma orientale.The obstacle degree of soil quality evaluation factors of Alisma orientale in Sichuan was between 0.03 and 0.08,and the Nash effective coefficient was 0.673,indicating that there were mild obstacle factors in the soil,and the accuracy of soil fertility evaluation based on the minimum data set was high.In summary,the soil quality evaluation system constructed by the minimum data set can represent the total data set for comprehensive evaluation of soil fertility in the main producing areas of Alisma orientale.In production,the soil pH value should be appropriately increased,nitrogen fertilizer and micro-fertilizer should be applied reasonably,and appropriate tillage management measures should be taken to improve the soil fertility of Alisma orientale and promote the growth and quality of Alisma orientale.