藏北高原自东向西样带典型植物群落中矮嵩草与紫花针茅小尺度空间格局变化

生态学杂志

藏北高原自东向西样带典型植物群落中矮嵩草与紫花针茅小尺度空间格局变化

李新娥¹,孟凡栋²,姜丽丽²,张立荣²,贾书刚^3,4,汪诗平^2,5*,崔霞⁶,吕汪汪^2,7

(¹扬州大学动物科学与技术学院动物营养与草业科学系，江苏扬州 225009；²中国科学院青藏高原研究所高寒生态重点实验室，北京 100101；³南宁师范大学广西地标作物大数据工程技术研究中心，南宁 530001；⁴南宁师范大学北部湾环境演变与资源利用教育部重点实验室，南宁 530001；⁵中国科学院青藏高原卓越中心，北京 100101； ⁶兰州大学资源环境学院，西部环境教育部重点实验室，兰州 730000; ^7中国科学院大学，北京 100049)

出版日期:2019-09-10 发布日期:2019-09-10

Small-scale spatial patterns of Kobresia humilis and Stipa purpureain typical plant communities from east to west across the northern Tibetan Plateau.

LI Xin-e¹, MENG Fan-dong², JIANG Li-li², ZHANG Li-rong², JIA Shu-gang^3,4, WANG Shi-ping^2,5*, CUI Xia⁶, LÜ Wang-wang^2,7

(¹College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; ²Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; ³Guangxi Geographical Indication Crops Research Center of Big Data Mining and Experimental Engineering Technology, Nanning Normal University, Nanning 530001, China; ⁴Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Nanning Normal University), Nanning 530001, China; ⁵CAS Center for Excellence in Tibetan Plateau Earth Science, Chinese Academy of Sciences, Beijing 100101, China; ⁶Key Laboratory of Western China’s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 7 University of Chinese Academy of Sciences, Beijing 100049, China).

Online:2019-09-10 Published:2019-09-10

摘要/Abstract

摘要： 植物群落中物种的小尺度空间格局，如聚集、随机和扩散分布，因环境条件而改变，反映了植物在不同环境条件下的生态适应策略。藏北高原区自东向西逐渐由亚寒带半湿润区向温带干旱区过渡，群落内物种多样性和物种组成发生了极大的改变。2012年7—8月份，在藏北高原自东向西选择了8个不同地区的典型草原植物群落进行样方调查，分析了植物群落物种组成、物种多样性以及矮嵩草（Kobresia humilis）和紫花针茅（Shtipa purpurea）两个种群的小尺度空间格局。结果显示：物种丰富度和矮嵩草的相对盖度均与年均降水量呈显著正相关；自东向西，矮嵩草种群则由扩散向随机格局转变，而紫花针茅种群由随机向扩散转变；在年均降水量最低的地区两个种群之间呈空间隔离关系。矮嵩草和紫花针茅种内及种间小尺度空间格局变化是在藏北高原自东向西样带梯度上影响两者共存的重要机制。

关键词: 大青鲨, 北大西洋, 种群统计分析, 敏感度分析, 开捕年龄

Abstract: The small-scale spatial pattern of plant species, such as aggregation, random and dispersion distribution, varies with environmental conditions, reflecting the ecological adaptation strategies of plant species. From east to west, it gradually transits from the semi-humid region of sub-frigid zone to the temperate arid region on the northern Tibet Plateau, with great variation of plant species diversity and species composition. From July to August 2012, eight typical grassland plant communities in different sites were selected from east to west in northern Tibet Plateau for field investigation. The species composition and species diversity of communities and smallscale spatial pattern of two populations of Kobresia humilisand Stipa purpurea were analyzed. The results showed that species richness and relative coverage of K. humilis were significantly positively correlated with precipitation. From east to west, the distribution of K. humilis changed from dispersion to random pattern, while that of S. purpurea changed from random to dispersion. There was a spatial segregation relationship between both populations with the lowest precipitation. Our results indicate that significant changes in small-scale spatial pattern of species are an important mechanism driving species coexistence in the communities along the transect on the northern Tibet Plateau.

Key words: Prionace glauca, North Atlantic Ocean, demographic analysis, sensitivity analysis, age at first capture.

李新娥,孟凡栋,姜丽丽,张立荣,贾书刚,汪诗平,崔霞,吕汪汪. 藏北高原自东向西样带典型植物群落中矮嵩草与紫花针茅小尺度空间格局变化[J]. 生态学杂志.

LI Xin-e, MENG Fan-dong, JIANG Li-li, ZHANG Li-rong, JIA Shu-gang, WANG Shi-ping, CUI Xia, Lü Wang-wang. Small-scale spatial patterns of Kobresia humilis and Stipa purpureain typical plant communities from east to west across the northern Tibetan Plateau.[J]. cje.