Effects Of Transgenic Cotton On Soil Microbial Biomass CARBON And Nitrogen And Small And Medium Arthropod Communities

Genetically modified crops have now been commercialized on a large scale,which has brought huge benefits,but at the same time,its related ecological and environmental safety issues have also attracted widespread attention.Soil is the material on the earth’s surface that can support plant growth,and it determines the sustainability of soil ecosystem functions.In terms of soil environmental safety assessment,soil animals are one of the most sensitive and important biological indicators.Crops cultivated by genetically modified technology will have an effect on the microorganisms around their roots.Therefore,people are very concerned about the soil environmental safety issues of planting genetically modified crops,and research on environmental safety assessment of genetically modified crops is gradually increasing.Our country is a large agricultural country,genetically modified cotton is one of the main genetically modified crops in my country,and whether its cultivation has potential ecological risks is very important.In this study,under the experimental conditions in the field,three monovalent transgenic cottons: transgenic drought-resistant cotton 013011,transgenic salt-tolerant cotton 013018,transgenic disease-resistant cotton HN6 and its receptor conventional cotton;a transgenic bivalent(BT+CPTI)Genetic cotton: 8 types of cotton including SGK321 and its recipient cotton were studied.Sampling and analysis were carried out at the seedling,bud,flower and boll stage and boll-out stage.The content of the analysis was that the four types of genetically modified cotton planted had an effect on soil microbial biomass carbon.The influence of nitrogen and small and medium-sized arthropod communities can be used to measure the effect of genetically modified cotton on the soil environment in which it grows,and to further measure its environmental safety.The main results are as follows:(1)Soil microbial biomass carbon and nitrogen of four groups of experimental cotton had no significant differences in the same growth period(p>0.05),and the soil microbial biomass carbon and nitrogen quantity of cotton varieties had significant differences in different growth periods(p<0.05),and the differences were different.Three groups of the unit price of transgenic cotton and conventional cotton shiyuan321 soil microbial carbon and nitrogen as the change of its growth period are the decreasing trend,and cotton SGK321 bivalent gene in different development stages of the three lower first,then increased trend,four groups of experiments of cotton soil microbial biomass carbon and nitrogen were significantly higher in seedling stage and wadding stages during the blooming period,But the content varies.(2)There was no significant difference in the number of small and medium-sized arthropod groups in the same growth period among the four experimental cotton groups(p>0.05).Among them,the number of groups of the other experimental cottons showed a trend of increasing first and then decreasing,except that the number of groups of the monounit drought-resistant transgenic cotton013011 and its recipient cotton TH2 showed a trend of decreasing continuously.The community composition of small and medium-sized arthropods in the soil of the transgenic cotton and its conventional cotton was slightly different but roughly similar.(3)There was no significant difference in the total number of small arthropods in the four groups of experimental cotton soils in the same growth period(p>0.05).Among them,except that the quantity change trend of acceptor cotton TH2 continued to decrease,the quantity change trends of other experimental cottons all increased first and then decreased.There was no significant difference in the community index of the four groups of experimental cotton(p>0.05).In short,planting genetically modified cotton did not have a significant impact on the amount of soil microbial biomass carbon and nitrogen and the composition and number of small and medium-sized arthropod communities in the soil.The growth period is the main influencing factor.