昆明烟区土壤线虫数量与环境因子的Mantel Test分析

Mantel Test Analysis of Soil Nematode Numbers and Environmental Factors in Kunming Tobacco Area

为进一步明确昆明烟区影响线虫的环境因素,于2022年采集云南昆明烟区8个县(市、区)64个乡镇的320个植烟土壤样品,调查与测定样品采集地的海拔、土壤线虫数量以及土壤理化性质(pH值及有机质、水解性氮、速效钾和有效磷含量),并探讨土壤线虫数量与植烟土壤环境因子之间的潜在关系。结果表明,昆明烟区土壤线虫数量一定程度上受到海拔及土壤理化性质的影响,海拔与有机质、水解性氮和速效钾呈显著正相关,pH值与有效磷呈极显著负相关,相关系数为-0.850;土壤线虫数量与土壤有效磷呈正相关,与海拔、pH值、有机质、水解性氮、速效钾呈负相关,其中与海拔、有机质和水解性氮的相关系数较大,分别为-0.751、-0.651和-0.568。通过Mantel test分析确定海拔、有机质和水解性氮含量是影响昆明烟区土壤线虫数量的重要因子。本结果可为有效防治土壤线虫提供科学依据。

In order to further clarify the environmental factors affect nematodes in Kunming tobacco area,320 soil samples from 64 towns in 8 counties(districts)were collected from the area in 2022.The altitude,number of soil nematodes,and soil physical and chemical properties(pH value,organic matter,hydrolyzable nitrogen,available potassium,and available phosphorus contonts)of the sample collection sites were investigated and determined,and the potential relationship between nematode number and environmental factors of tobacco planting soil was explored.The results showed that the number of soil nematodes in Kunming tobacco areas was influenced by altitude and soil physical and chemical properties to a certain extent.There were significant positive correlations between altitude and organic matter,hydrolyzed nitrogen and available potassium.pH value was highly significantly negatively correlated with available phosphorus with a correlation coefficient of-0.850.The number of soil nematodes was positively correlated with available phosphorus,while negatively correlated with altitude,pH value,organic matter,hydrolyzed nitrogen and available potassium.Among them,the correlation coefficients of the number of soil nematodes with altitude,organic matter and hydrolyzed nitrogen were relatively higher as-0.751,-0.651 and-0.568,respectively.Through Mantel test analysis,altitude,organic matter and hydrolytic nitrogen were determined as the important factors affecting the number of soil nematodes in Kunming tobacco growing areas.These results could provide scientific basis for effective control of soil nematodes.