楼子山鸟类群落多样性与归一化植被指数NDVI密切相关

Human activities are worldwide modifying natural ecosystems in different ways and scales,with land-use change recognized as one of the main causes of global biodiversity decline.This study conducted bird diversity surveys in the Louzishan Nature Reserve using the sampling method in summer(May-June 2023)and winter(November 2022 and February 2023).Utilizing remote sensing data to represent plant productivity(Normalized Difference Vegetation Index,NDVI)and land-use diversity,exploring the impact of environmental factors on taxonomic and functional species richness and species composition differences(alpha and beta diversity),to validate the productivity-biodiversity and variability-biodiversity hypotheses.In addition,beta diversity was partitioned into turnover and nestedness components to further study the patterns and compositional differences of bird communities in Louzishan during summer and winter.The results showed that in summer bird communities,taxonomic alpha diversity showed an increase with the increase of NDVI;taxonomic beta diversity and its turnover component increased with the increase of NDVI,while the nestedness component increased with the increase of land-use diversity.That is,the differences in taxonomic diversity in this region were mainly driven by species replacement and closely related to plant productivity.Functional alpha diversity also increased with increasing NDVI;however,we failed to find significant effects of the two environmental factors on functional beta diversity and its components.In winter bird communities,we only found that taxonomic alpha diversity was negatively correlated with land-use diversity,that is,areas with lower land use diversity had higher bird taxonomic diversity.Overall,the results support the productivity-biodiversity hypothesis and emphasize the role of NDVI as an important environmental variable that influences the process of shaping species richness and compositional differences in birds.