青藏铁路沿线高寒草甸区次生群落特征及种间关联性  

Secondary community characteristics and interspecific associations in alpine meadow areas along the Qinghai-Tibet railway

作　　者：徐赟 罗久富 周金星 王丽娜[1,2] 杨梅香 XU Yun;LUO Jiufu;ZHOU Jinxing;WANG Lina;YANG Meixiang(Beijing Forestry University/School of Soil and Water Conservation,Key Laboratory of State Forestry Administration on Soil and Water Conservation,Beijing 100083,China;Beijing Forestry University/Yunnan National Waterborne Desert Ecosystem National Positioning Observation Station,Beijing 100083,China)

机构地区：[1]北京林业大学水土保持学院/水土保持国家林业局重点实验室,北京100083 [2]北京林业大学/云南建水荒漠生态系统国家定位观测研究站,北京100083

出　　处：《草业科学》2020年第1期41-51,共11页Pratacultural Science

基　　金：林业公益性行业科研专项经费资助项目(201504401);西藏那曲市城镇植树关键技术研究;西藏那曲地区城镇植树关键技术研发与绿化模式示范(2017YFC0506800)

摘　　要：物种组成和种间关系决定了群落的特征和动态。为揭示青藏铁路对高寒草甸区植被物种组成和种间关联的影响,沿青藏铁路唐古拉山至那曲段,分别在距离铁路垂直距离5 m和300 m处设置样方,研究铁路沿线工程迹地次生群落和非工程迹地高寒草甸群落的物种组成和种间关联性;在对样方进行群落学调查的基础上,使用方差比率法、χ^2检验法以及Spearman秩相关系数检验法,对植被群落总体关联性和种间关联性进行分析,结果表明:与非工程迹地群落相比,工程迹地次生群落物种组成发生了显著变化,次生物种数少于非工程迹地群落,但耐旱物种增加;次生群落植物分属17科,36属,46种;非工程迹地群落植物分属18科,38属,54种。方差比率检验发现,次生群落与非工程迹地群落统计量W分别为51.84 (χ0.05(36)^2=51.00),42.09 (χ0.95(36)^2=23.27),说明非工程迹地群落内总体关联度为不显著正关联,而次生群落群落总体关联度为显著正关联。主要物种种对间关联性显示,与非工程迹地群落相比,工程迹地次生群落种对间正关联比例上升,群落内各物种间的联结程度增强。总体上,工程迹地次生群落物种组成近10年内仍以耐旱耐贫瘠植物为主,处于演替过程中一个较稳定的阶段,短期或者较长时间内难以恢复至顶级高寒草甸群落。Species composition and interspecific relationships determine the characteristics and dynamics of a community. In order to explore the influence of the Qinghai-Tibet Railway route on the alpine meadow plant community in the QinghaiTibet Plateau–along the Tanggula Mountain to Naqu section–plots were set at 5 m and 300 m, respectively from the railway.On the basis of the community survey of plots, the variance ratio method, the χ^2 test method and the Spearman rank correlation coefficient test were used to analyze the overall correlation and inter-species correlation of the vegetation community. The results show that: Compared with the non-engineered site, the species composition along the engineered site changed significantly. The number of species in the engineered site was less than that in the non-engineering site, but the number of drought-tolerant species increased in engineered site. The plants at the engineered site belonged to 17 families, 36 genera, and 46 species, whereas the plants at the non-engineered site comprised 18 families, 38 genera, and 54 species. The variance ratio test shows that the community of engineered and non-engineered site statistic W were 51.84(χ0.95(36)^2= 23.27)and 42.09( χ0.05(36)^2 = 51.00), indicating that the overall correlation degree of the community in the non-engineered site did not show a significant positive association, while the overall correlation degree of the communities at the engineered site showed a significant positive association. The correlation between the main species showed that compared with that in the non-engineered site, the positive correlation ratio between the species pairs at the engineered site is increased, and the degree of association among the species within the community is also increased. In general, the species composition of the secondary community in the engineered site has been dominated by drought-tolerant and barren-resistant plants in the past 10 years, and it is at a relatively stable stage in the succession process. It is diff

关 键 词：种间关联 青藏铁路 植物群落 高寒草甸 工程迹地 Spearman秩相关 Χ^2检验 

分 类 号：Q948[生物学—植物学]