施加生物质炭对风沙土土壤线虫群落结构的影响OA北大核心CSTPCD

The amount and timing of biochar application in scientific settings are currently the focal points of research aimed at enhancing and maintaining soil health.In this study,two groups of corn pot experiments(groups A and C)were designed.Group A was treated with a one-time application of biochar for 7 years,and group C was treated with a one-time application of biochar for 1 year.The application rates of each group were 0,15.75,31.50,63.00 t·hm-2,and 126.00 t·hm-2,respectively.The effects of different amounts and timings of biochar application on the structural characteristics of nematode communities in sandy soil were studied.The results showed that the application of biochar could increase soil pH and nutrient content after 1 year.The effect of biomass charcoal on soil nutrient would decrease over time with aging.The dominant genus of soil nematodes was Acrobeloides,and bacterivores and predators/omnivores were the main trophic groups.Soil organic matter decomposition was dominated by bacterial decomposition.The increase in biochar application amount changed the soil nematode community structure,trophic group distribution,and nematode abundance after one year of biochar application.The increase in the amount of biochar applied substantially inhibited the number of soil nematodes.However,the number of soil nematodes recovered after 7 years of biochar application.With increasing years after application,biochar application led to a decrease in the abundance of soil bacterivores and an increase in the abundance of predators/omnivores and plant parasitic nematodes;however,it exerted little effect on the nematode diversity and richness indexes.A one-time application of 126.00 t·hm-2 biochar substantially reduced the number of soil nematodes after 7 years,whereas the application of 15.75 t·hm-2 biochar exerted a positive effect on the number and community structure of soil nematodes.