Study on the Diversity of Spider Community under Different Afforestation Patterns in the Northern and Southern Mountains of Lhasa
s:Spiders are important natural enemies in forest ecosystems and play an important role in maintaining ecosystem balance.In order to understand the composition and functional groups of spider community under the different afforestation models,seven different afforestation models were selected in the Northern and Southern Mountains of Lhasa from May to September 2023.The spiders were collected by using the Markov network and the sweep net method.Margalef richness index,Shannon-Wiener diversity index,Simpson diversity index,Jacca-rd similarity coefficient,Berger-Parker dominance index and clustering were used for analyzing the composition and functional groups of spider community under the different afforestation models.A total of 1 519 spiders were obtained,belonging to 55 species,36 genera and 20 families.Overall,the genus of Cyclosa has the largest num-ber of spiders with 306 specimens.In terms of dominance,Oxyopes licenti,Cyclosa sp.and Tetragnatha extensa were the dominant groups,accounting for 8.95％,20.14％and 8.56％of the total number of spiders,respective-ly.The results of spider community diversity under different afforestation modes showed that the highest number of spiders(400)collected under the JXBY mode and the lowest number of spiders(86)under the XH mode.In terms of spider functional groups diversity,round-web spiders has the highest Shannon-Wiener diversity index and Simpson diversity index,and ambush predatory spiders has the lowest Shannon-Wiener diversity index and Margalef richness index.Among the functional groups,ground-dwelling and round-web spiders have the highest number of spider specimens with 500 and 372 specimens,respectively,and ambush predatory spider has the low-est the number of spider specimens with 5 specimens.The results of similarity and cluster analysis of different af-forestation models showed that the similarity between spider communities was moderately dissimilar and moder-ately similar,and the similarity of spider functional groups between the different afforestation models was moder-ately similar and extremely similar.
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