Effects of tobacco varieties and ridge culture on diversity of soil microarthropods
[Objective]The effects of microenvironment variations on the community composition and diversity of soil microarthropods in tobac-co fields were explored to provide the scientific basis for selecting optimal varieties for cultivation and determining planting patterns in karst tobacco-growing areas.[Method]The community composition and diversity of soil microarthropods in the growing areas of Yunyan 87 and K326 were investigated by the Tullgren method in July 2022 in Fenggang county of Guizhou province.Based on the investigation,the rela-tionship between soil microarthropods and microenvironment(tobacco varieties,planting pattern and their interactions)was analyzed.[Re-sult]A total of 6 classes,16 orders and 70 families of soil microarthropods were identified in the sample plot.The soil microarthropod com-munity composition was significantly different between K326 and Yunyan 87.In K326,the soil microarthropod community composition was very significantly different between ridge and furrow,while no significant difference was observed in Yunyan 87 between the ridge and fur-row.Furthermore,the soil microarthropod community composition in the ridge varied very significantly between K326 and Yunyan 87,but no significant difference was observed between K326 and Yunyan 87 in the furrow pattern.The richness,density and Shannon index(H')of soil microarthropods in K326 were 4.18,5535.56 and 1.16,respectively,which were significantly higher than those in Yunyan 87(values of 2.12,1720.00 and 0.65,respectively).Furthermore,these indexes in the ridge of K326 were 5.47,10 520.00 and 1.40,respective-ly,which were significantly greater than those in the furrow pattern(values of 2.90,551.11 and 0.92,respectively).Notably,only the density of soil microarthropods in the ridge(3000.00)of Yunyan 87 was higher than that in the furrow(400.00),while the richness and Shannon index(H')had no obvious differences.Moreover,the richness,density and Shannon index(H')of soil microarthropods in the ridge of Yunyan 87 were 1.97,3000.00 and 0.61,respectively,which were significantly lower than those in the ridge of K326(values of 5.47,10 520.00 and 1.40,respectively),whereas no significant differences were found in these parameters between the furrow areas of Yunyan 87 and K326.[Conclusion]The influence of micro-topographical variations resulting from ridge cultivation on soil microarthropods is regulated by the tobacco varieties,and soil microarthropods inhabiting the ridges displays greater sensitivity to tobacco variety changes com-pared to those in the furrows.
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