{"title":"青藏高原东北部各向异性物种共存与多样性维持机制","authors":"Minxia Liu, Xinyu Wang, Yibo Ma, Lu Xu","doi":"10.1071/rj20042","DOIUrl":null,"url":null,"abstract":"To examine the role of plant functional traits and phylogenetic relationships in predicting plant community species coexistence and diversity maintenance, we measured 73 species and six functional traits along a slope aspect gradient on the Qinghai-Tibetan plateau. We calculated the net relatedness index (NRI), the nearest taxon index (NTI), phylogenetic diversity (PD), functional diversity, and analysed phylogenetic signals. The results show that the species richness, plant composition, and PD changed substantially from northern to southern aspects, and the phylogenetic structure of the community changed from clustering to over-dispersion. Weak phylogenetic signals in plant height, leaf nitrogen content, and leaf potassium content were recorded. We conclude that the influencing factor(s) of species coexistence on northern and north-western aspects is limiting similarity (interspecific competition), whereas on southern and south-western aspects, habitat filtering (environmental effect) is predominant. On western aspects, the influencing factors are driven by three processes: limiting similarity, habitat filtration, and random processes. Results suggest that niche processes (including habitat filtration and limiting similarity) are the main mechanisms for species coexistence and diversity maintenance on aspects of the alpine meadow in the northeast of the Qinghai-Tibetan plateau, while random processes appear at the transitional zone (the western aspect in our study) between aspects.","PeriodicalId":20810,"journal":{"name":"Rangeland Journal","volume":" ","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"The mechanism of species coexistence and diversity maintenance along aspects in the northeast of the Qinghai-Tibetan plateau\",\"authors\":\"Minxia Liu, Xinyu Wang, Yibo Ma, Lu Xu\",\"doi\":\"10.1071/rj20042\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"To examine the role of plant functional traits and phylogenetic relationships in predicting plant community species coexistence and diversity maintenance, we measured 73 species and six functional traits along a slope aspect gradient on the Qinghai-Tibetan plateau. We calculated the net relatedness index (NRI), the nearest taxon index (NTI), phylogenetic diversity (PD), functional diversity, and analysed phylogenetic signals. The results show that the species richness, plant composition, and PD changed substantially from northern to southern aspects, and the phylogenetic structure of the community changed from clustering to over-dispersion. Weak phylogenetic signals in plant height, leaf nitrogen content, and leaf potassium content were recorded. We conclude that the influencing factor(s) of species coexistence on northern and north-western aspects is limiting similarity (interspecific competition), whereas on southern and south-western aspects, habitat filtering (environmental effect) is predominant. On western aspects, the influencing factors are driven by three processes: limiting similarity, habitat filtration, and random processes. Results suggest that niche processes (including habitat filtration and limiting similarity) are the main mechanisms for species coexistence and diversity maintenance on aspects of the alpine meadow in the northeast of the Qinghai-Tibetan plateau, while random processes appear at the transitional zone (the western aspect in our study) between aspects.\",\"PeriodicalId\":20810,\"journal\":{\"name\":\"Rangeland Journal\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":1.2000,\"publicationDate\":\"2021-07-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Rangeland Journal\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1071/rj20042\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rangeland Journal","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1071/rj20042","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ECOLOGY","Score":null,"Total":0}
The mechanism of species coexistence and diversity maintenance along aspects in the northeast of the Qinghai-Tibetan plateau
To examine the role of plant functional traits and phylogenetic relationships in predicting plant community species coexistence and diversity maintenance, we measured 73 species and six functional traits along a slope aspect gradient on the Qinghai-Tibetan plateau. We calculated the net relatedness index (NRI), the nearest taxon index (NTI), phylogenetic diversity (PD), functional diversity, and analysed phylogenetic signals. The results show that the species richness, plant composition, and PD changed substantially from northern to southern aspects, and the phylogenetic structure of the community changed from clustering to over-dispersion. Weak phylogenetic signals in plant height, leaf nitrogen content, and leaf potassium content were recorded. We conclude that the influencing factor(s) of species coexistence on northern and north-western aspects is limiting similarity (interspecific competition), whereas on southern and south-western aspects, habitat filtering (environmental effect) is predominant. On western aspects, the influencing factors are driven by three processes: limiting similarity, habitat filtration, and random processes. Results suggest that niche processes (including habitat filtration and limiting similarity) are the main mechanisms for species coexistence and diversity maintenance on aspects of the alpine meadow in the northeast of the Qinghai-Tibetan plateau, while random processes appear at the transitional zone (the western aspect in our study) between aspects.
期刊介绍:
The Rangeland Journal publishes original work that makes a significant contribution to understanding the biophysical, social, cultural, economic, and policy influences affecting rangeland use and management throughout the world. Rangelands are defined broadly and include all those environments where natural ecological processes predominate, and where values and benefits are based primarily on natural resources.
Articles may present the results of original research, contributions to theory or new conclusions reached from the review of a topic. Their structure need not conform to that of standard scientific articles but writing style must be clear and concise. All material presented must be well documented, critically analysed and objectively presented. All papers are peer-reviewed.
The Rangeland Journal is published on behalf of the Australian Rangeland Society.