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引用本文:郑文秀,王荣,张恩楼,曹艳敏,孔德平.近200 a来云南阳宗海摇蚊群落多样性及稳定性变化.湖泊科学,2018,30(3):847-856. DOI:10.18307/2018.0326
ZHENG Wenxiu,WANG Rong,ZHANG Enlou,CAO Yanmin,KONG Deping.Diversity and stability dynamic of chironomid assemblages in the last two centuries of Lake Yangzong, Yunnan Province. J. Lake Sci.2018,30(3):847-856. DOI:10.18307/2018.0326
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近200 a来云南阳宗海摇蚊群落多样性及稳定性变化
郑文秀1,2, 王荣1, 张恩楼1, 曹艳敏3, 孔德平4
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院大学, 北京 100049;3.中南民族大学资源与环境学院, 武汉 430074;4.云南省环境科学研究院高原湖泊流域污染过程与管理云南省重点实验室, 昆明 650034
摘要:
云南省拥有丰富的生物多样性,其生态系统稳定性对于发挥生态系统服务功能十分重要,但近几十年以来的人类活动以及气候变化带来的干扰削弱了该区域的生态系统功能.本文以阳宗海为研究对象,探讨了1820s-2006年间人类活动背景下摇蚊群落多样性和稳定性的变化过程,并进一步探讨阳宗海摇蚊群落多样性与稳定性之间的关系.利用沉积物中的营养指标(总有机碳(TOC)含量、总氮(TN)含量和TOC/TN摩尔比)及摇蚊分别重建了湖泊营养变化及摇蚊群落物种丰富度、均匀度、相似度和稳定性(ar1),利用PCA第1轴代表摇蚊群落以检测突变点.研究发现摇蚊群落组成与湖泊营养变化有较好的一致性,二者在1990年左右发生突变,物种丰富度、均匀度和相似度指数分别在1950s、1990s初以及1970s初升高,说明摇蚊群落组成逐渐多样化,种属分布更加均匀.通过检测发现摇蚊群落稳定性在1960s初开始降低,比湖泊系统突变提前30 a左右.摇蚊群落的物种丰富度、均匀度以及稳定性指标伴随着湖泊外源营养物质输入比例增加而升高,群落多样性与稳定性之间的相关性分析表明群落稳定性随物种丰富度的升高而降低.
关键词:  阳宗海  湖泊生态系统  摇蚊  多样性  稳定性  突变
DOI:10.18307/2018.0326
分类号:
基金项目:科技基础性工作专项项目(2014FY110400)、国家重点研发计划项目(2017YFA0605200)、国家自然科学基金项目(41302277)和云南省科技计划项目(2015RA084)联合资助.
Diversity and stability dynamic of chironomid assemblages in the last two centuries of Lake Yangzong, Yunnan Province
ZHENG Wenxiu1,2, WANG Rong1, ZHANG Enlou1, CAO Yanmin3, KONG Deping4
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, P. R. China;4.Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-watershed, Yunnan Institute of Environmental Science, Kunming 650034, P. R. China
Abstract:
Yunnan province is rich in biodiversity and is critical for providing ecosystem services. Human disturbances and climate change in recent decades have put the ecosystem under stress, making it urgent to study biodiversity and stability of this region. Here, sediment records covering 1820s-2006 were collected from Lake Yangzong and were used to explore the patterns of diversity and stability and their relationship. Changes in lake nutrient, chironomid diversity (species richness), evenness (Invsimpson), similarity (Jaccard) and stability (ar1) were reconstructed based on nutrient indicators (total organic carbon (TOC) content, total nitrogen (TN) content and TOC/TN) and chironomid assemblages. Principal components analysis of chironomid community data was used for critical point detection. We found that TOC and TN contents increased, and abrupt changes in the chironomid community occurred since 1990. Meanwhile, community diversity, evenness and similarity all showed a rising trend. Clear increases in diversity from the 1950s, evenness from the early 1990s, and similarity and instability from 1970s indicate higher diversity and evenness of chironomid communities, corresponding well with the rising in TOC content. The increasing in TOC/TN ratio had a positive correlation with species richness, evenness and similarity, respectively, however, a negative correlation was obtained with stability. The significant negative correlation between chironomid species richness and stability in Lake Yangzong suggested that the species richness depleted its stability.
Key words:  Lake Yangzong  lake ecosystem  chironomid  diversity  stability  critical point
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