Diversity Analysis Of Surface Arthropods In The Interchange Zone Of Forrest And Wetland In Changbai Mountain

The excessive forest wetland zone is characterized by the co-existence of various vegetation,which is different from that of other vegetation zones.In order to reveal the composition characteristics of arthropods on the surface of forest wetland ecotone and the environmental factors affecting its structure,the forest wetland ecotone in Yuanchi Wetland Nature Reserve of Jilin Province was taken as the research object,and the main community types were divided.The surface arthropods of each community were investigated and analyzed in the field.In order to provide reference for the study and protection of Jilin Yuanchi Wetland Nature Reserve.The study area includes five vegetation zones:conifer and broad-leaf mixed forest belt,Arbor belt,shrubby belt,herbaceous zone and shrubs and herbaceous transition zone,which belongs to the typical forest wetland ecotone.In this paper,the distribution of surface arthropods was analyzed,and the diversity of surface arthropods communities in this area was investigated 10 times from May to September 2018.The diversity of arthropod community on the surface was investigated from five aspects:the composition of the community,the structural plate of the dominant community,the difference and relationship among different vegetation zones,the seasonal variation of the community,the community structure and the physical and chemical properties of the soil.The results are as follows:A total of 30251 surface arthropods belonging to 10 classes and 21 orders were captured in five different vegetation zones in this area.Hymenoptera,Diptera and Elaeagnus account for the largest proportion,which is the main component of arthropods in the forest wetland ecotone.There is a clear difference and regularity in the distribution of surface arthropod groups and total numbers in each vegetation zone in this study area.The results of a diversity index analysis showed that the complexity of surface arthropods was the highest in the shrubs zone,followed by the Arbor belt.The species distribution of conifer and broad-leaf mixed forest belt is relatively stable,but the herbaceous zone is opposite.Moreover,the proportion of some species in the herbaceous zone is high,which makes the herbaceous belt have the highest dominance.There are regular differences not only in different vegetation,but also in different seasons.In the analysis of community structure in each season,it was found that the total number of communities in summer was the largest and that in autumn was the least.Surface arthropods are more suitable for the June climate and significantly reduced activity after cooling in September.The characteristics of dominant groups are the same.The results of principal component analysis of surface arthropods showed that there were obvious differences between dominant groups and common groups and rare groups.All vegetation belts not only have different laws,but also have some similarity.According to the analysis of ? diversity,the composition of the surface arthropods in shrub and herbaceous zones is most similar in different vegetation zones,and most similar in July and August in different seasons.However,the difference between the surface arthropods in different vegetation zones and different seasons is not significant,and the similarity is more than half,which has higher similarity.The results of soil water content,PH value and individual body number in different vegetation zones showed that the soil water content in different vegetation zones was caused by the different environmental requirements of different species.The PH value is different from the number of surface arthropods.The overall PH value of this area changed little,so the influence of soil water content on its quantity was greater.Pearson correlation coefficient analysis showed that soil PH value,hydrolyzed nitrogen and total nitrogen content significantly affected the commmunity structure of arthropods on the surface.At the same time,redundancy analysis and Monte Carlo replacement test showed that soil available phosphorus soil organic matter and soil total nitrogen had significant effects on the main soil communities.