Abstract:

In order to further understand the relationship of different forage strategy spiders and the regulating factors, the study was performed as a microcosm experiment in two soils with different Nitrogen content. The paper studied interspecific and intraspecific competition under the influence of Collembola abundance and spider individual density. Our study demonstrated that wandering spiders’ mortality rate could increased with spider individual density, while sit-and-wait spiders’ biomass variation displayed a significant negative increase in CK treatment. Individual density of mixed species spiders has no influence on mortality, but the biomass variation expressed negative growth. In the +N treatment, wandering spiders’ individual density significantly influenced the mortality rate and biomass variation, while sit-and-wait spiders’ individual density has no influence on mortality rate and biomass variation. Increasing individual density of mixed species spiders would lead to higher mortality rate and positive biomass variation. The intraspecific competition of wandering spiders usually displayed on mortality rate, but the sit-and-wait spider’s intraspecific competition mainly displayed on biomass variation. The interspecific competition between mixed species was shown on the mortality rate change, and wandering spiders have a higher mortality rate.