Effects Of Food Resource Addition On The Pattern And Formation Mechanism Of Ground Beetles Metacommunity In The Broad-leaved Korean Pine Forest Of Liangshui Nature Reserve In The Xiaoxing'an Mountains

The theory of metacommunity provides one of the most effective and important theoretical methods for the study of the pattern and formation mechanism of the biological community in the terrestrial ecosystem,but at present,the study on the pattern and formation mechanism of the metacommunity of soil animals is very rare.From August 7 to 13,2018,taking Liangshui National Nature Reserve as the research area,the trap method was adopted to capture ground beetles,aiming to clarify the impact of food resource addition on the ground beetles assemblage community in Xiaoxing'an Mountain Liangshui broad-leaved Korean pine forest.The results showed that 1566 and 40 species of s ground beetles were captured in the experiment,and the number of individuals and species in the ground beetles community with food resource was significantly higher than that without food resource,indicating that the number of individuals and species of ground beetle community in the broad-leaved Korean pine forest with food resources was significantly affected by food resources.Because of the different living habits of different groups of ground beetles,the effect of adding food resources on the number of individuals and species of different groups of ground beetles metacommunity is different.The diversity index?H'?,dominance index?D?and evenness index?J?of the ground beetles metacommunity with food resources were significantly higher than those without food resources.The beta diversity of the ground beetles metacommunity without food resources is significantly higher than that of the ground beetle community with food resources,and the beta diversity is mainly composed of spatial species turnover,and the contribution of nestedness of species assemblages is very small.The metacommunity of ground beetles and all kinds of groups with and without food resources showed random pattern,indicating that the effect of food resources addition on the ground beetle community and different groups in this scale and pattern was not significant.Based on FE rule,C-score was significantly lower than the expected value?simulation value?,while V-ratio was significantly higher than the expected value,indicating that the ground beetle community with and without food resources was a non-random cluster character.The niche overlap index of pianka O_ik also showed that the competition among species was not significant.To sum up,the processes of environmental filtering and dispersal limitation may lead to the pattern and formation mechanism of the ground beetles metacommunity with and without food resources,and the ground beetles metacommunity is jointly controlled by the theory of species sorting and mass effect,which further shows that the regulation mechanism of the ground beetles metacommunity in broad-leaved Korean pine forest is not significantly influenced by food resources.This study is bound to promote the study of the community pattern and formation mechanism of soil fauna,and provide theoretical and data basis for underground biodiversity protection and management.