Abstract:In order to understand the changes of plant community phylogenetic structure and species diversity in alpine meadow of Qinghai Tibet Plateau, plant communities and environmental factors of alpine meadow were measured at five different altitudes, net relative index (NRI) and nearest taxon index (NTI) were calculated, and the changes of phylogenetic structure and phylogenetic diversity were discussed. The results showed that with the increase of altitude, soil temperature, soil water content, soil total nitrogen and organic carbon decreased. The number of richness, Shannon-Weiner index and phylogenetic diversity of plant community showed a "humped-back" relationship with the increase of altitude. Community species diversity reached the maximum at 3500m. The betaMPD increased with the increase of altitude, indicating that species aggregation was affected by habitat filtration. The low altitude (3000m) community had divergent (NRI < 0, NTI < 0), and competition exclusion played a major role; at lower altitude (3250m) and middle altitude (3500m), there were aggregation (NRI > 0, NTI > 0) and divergence (NRI < 0, NTI < 0), indicating that habitat filtration and competitive exclusion jointly maintained the species diversity of the community; community phylogenetic structure aggregation (NRI > 0, NTI > 0) at high altitude (3750m, 4000m) was related to species convergence evolution and habitat filtration. Multiple regression analysis showed that soil temperature and soil water content were the main influencing factors of species coexistence in different altitudes. This study reveal that the changes of plant community phylogenetic structure and diversity pattern of alpine meadow in Qinghai Tibet Plateau, indicating that niche process is an important mechanism to maintain the diversity of plant communities.
徐璐, 刘旻霞, 穆若兰, 张国娟, 于瑞新, 李亮. 高寒草甸植物群落谱系结构与多样性格局[J]. 中国环境科学, 2021, 41(3): 1387-1397.
XU Lu, LIU Min-xia, MU Ruo-lan, ZHANG Guo-juan, YU Rui-xin, LI Liang. Phylogenetic structure and diversity pattern of plant community in alpine meadow. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1387-1397.
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