草业学报2025，Vol.34Issue(3)：29-40,12.DOI:10.11686/cyxb2024173
草地植物多样性沿海拔梯度分布特征及其驱动因素
Distribution characteristics of grassland plant diversity along the altitudinal gradient and its driving factors:A case study of the eastern section of the northern slope of the Tianshan Mountains
摘要
Abstract
Exploring the distribution pattern of species diversity,and its driving factors,in mountain grassland ecosystems along altitude gradients is of great importance to understanding of the environmental adaptability of regional plants,and requirements for the conservation of regional diversity and vegetation restoration and management.In this study,the quantitative characteristics and species diversity of plant communities in Qitai County,on the eastern section of the northern slopes of the Tianshan Mountains,were measured and analysed at 15 sites along altitudinal gradients spanning from 1250-3150 m.We also used the random forest model and the partial least squares path modeling(PLS-PM)to analyse the relationship between altitude,temperature,precipitation,and quantitative characteristics of the plants and plant diversity.The results showed that:1)With increasing altitude,the grassland plant community cover and density showed a highly significant increasing trend,while the plant height showed a highly significant decreasing trend,and the biomass showed an initially decreasing trend and then an increasing trend(P<0.01);2)The α-diversity of plants was maximized(P<0.05)at mid-altitude along the altitudinal gradient,and the Sorenson index between neighboring altitudes showed an overall pattern of initial decrease and then increase with increasing altitude,while the Cody index of species substitution rate showed a tendency of increasing and then decreasing;3)Plant cover,biomass,and Patrick's index were all significantly correlated with climate(P<0.05),with plant diversity mainly directly affected by cover,and elevation indirectly affecting plant density by significantly affecting temperature and precipitation,plant density also significantly positively affects plant coverage(P<0.01).In summary,altitude indirectly affects the characteristics of plant communities by influencing climate,giving the plant communities a distinct vertical distribution along the altitudinal gradient.关键词
海拔/植物多样性/驱动因素/气候因素Key words
altitude/plant diversity/driving factor/climatic factor引用本文复制引用
姜安静,安沙舟,董乙强,周时杰,聂婷婷,吴悦,柳泽宇,单兴芸,雷雅欣,吴凯..草地植物多样性沿海拔梯度分布特征及其驱动因素[J].草业学报,2025,34(3):29-40,12.基金项目
国家自然科学基金(32260355)和新疆农业大学自治区研究生创新项目(XJ2024G122)资助. （32260355）
