Effects of Limnodrilus on soil microorganisms in paddy field

Through sampling in field and experiment in laboratory, the effects of benthos Limnodrilus on soil microorganisms (microflora, biomass, special physiological groups) in paddy field were preliminarily investigated. The quantities of soil bacteria, actinomycetes and fungus in Limnodrilus group were higher than those in control group, at significance level P <0.01, P <0.05, and P <0.01 respectively. The quantities of soil microbial biomass C and N in Limnodrilus group were remarkably higher than those in control group, both at significance level P<0.01. Limnodrilus promoted the multiplication of sulfur bacteria, nitrobacteria, cellulose decomposing bacteria, ammonifying bacteria, and nitrogen fixing bacteria in paddy soil, inhibited the growth and activity of sulfate reducing bacteria and nitrate reducing bacteria, which was beneficial for increasing availability of biogenic elements including sulfur, nitrogen, phosphorus, and improving the nutrient utilization efficiency of paddy soil. Using bioturbation effect of benthic animals, based on the ecological features of creatures on different trophic levels in agro-ecosystems, modern agricultural technologies for multiclass matter cycling, multi -level utilization, multi -species symbiosis may be developed, so as to provide support for sustainable agriculture.