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应用生态学报 ›› 2018, Vol. 29 ›› Issue (9): 3120-3130.doi: 10.13287/j.1001-9332.201809.006

• 研究报告 • 上一篇    下一篇

基于硅藻功能群特征揭示海西海近现代生态环境变化

王教元1, 陈光杰1*, 康文刚1, 胡葵1, 陈小林2, 吴飞红3, 朱庆生1, 冯钟1   

  1. 1云南师范大学旅游与地理科学学院高原地理过程与环境变化云南省重点实验室, 昆明 650500;
    2玉溪师范学院资源环境学院, 云南玉溪 653100;
    3西南大学地理科学学院, 重庆 400715
  • 收稿日期:2018-01-03 出版日期:2018-09-20 发布日期:2018-09-20
  • 通讯作者: E-mail: guangjiechen@gmail.com
  • 作者简介:王教元, 男, 1989年生, 博士研究生.主要从事湖泊沉积与全球变化研究. E-mail: ynnusparks@hotmail.com, huaishijiaoyuan@163.com
  • 基金资助:

    本文由教育部科学技术研究项目(213034A)、国家重点研发计划项目(2017YFA0605202)和国家自然科学基金项目(41171048,U1133601)资助

Spatial distributions and environmental control of diatom functional groups in sediments of Haixi Lake, Southwest China.

WANG Jiao-yuan1, CHEN Guang-jie1*, KANG Wen-gang1, HU Kui1, CHEN Xiao-lin2, WU Fei-hong3, ZHU Qing-sheng1, FENG Zhong1   

  1. 1Yunnan Province Key Laboratory of Plateau Geographical Processes and Environmental Change, School of Tourism and Geography, Yunnan Normal University, Kunming 650500, China;
    2School of Resources and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China;
    3School of Geographical Sciences, Southwest University, Chongqing 400715, China.
  • Received:2018-01-03 Online:2018-09-20 Published:2018-09-20
  • Supported by:

    This work was supported by the Science and Technology Research Program of Ministry of Education of China (213034A), the National Key Research and Development Plan (2017YFA0605202), and the National Natural Science Foundation of China (41171048, U1133601).

摘要: 依据硅藻的形态、生理与生态特点而定义的功能群分类,可以更好地描述对湖泊环境胁迫的响应特征.本研究识别了海西海表层沉积物硅藻群的空间分布模式,并通过多指标分析探讨其与环境因子的关系.结果表明: 主成分分析和冗余分析,水深和沉积物总氮含量是硅藻功能群空间分布异质性的主要驱动因子;水深8 m左右可能是海西海硅藻出现功能群分异的阈值,与热力分层深度等湖泊水文特征相对应.上述表层沉积物硅藻功能群空间分布结果为沉积物化石记录的解释提供了依据.沉积物钻孔分析显示,近百年来海西海硅藻功能群呈现明显的阶段性波动,与年均气温、沉积物总氮含量、中值粒径等指标变化相对应.气候变暖、富营养化和水位上升是驱动海西海硅藻功能群长期变化的主要环境因子,协同促进了功能群D、P、MP占优势.硅藻功能群多样性变化的长期特征表明气候变暖和营养盐富集促进了硅藻功能群多样性的增加,而海西海1957年筑坝和1990年水库扩容两次典型水文调控显著增加了湖泊水深,导致硅藻功能群多样性降低.

Abstract: Functional group classification based on the morphological, physiological and ecological characteristics of diatoms is advanced in describing the tolerance and sensibility of diatoms to environmental stressors. In this study, we examined the spatial distribution of diatom functional groups in surface sediments of Haixi Lake and explored the relationships between diatom distributions and environmental variables using multivariate analyses. Principal components analysis (PCA) and redundancy analysis (RDA) results showed that water depth and total nitrogen (TN) were the key drivers for the heterogeneous distribution of diatom functional groups. Water depth of ca. 8 m was the threshold depth in influencing diatom functional group structures linking with thermal stratification. These results provided a basis for fossil record interpretation of the short core. Diatom functional groups fluctuated over the last century, in keeping with mean annual temperature, sediment TN, and median grain size. Climate warming, accelerated nutrient enrichment and intensified hydrological changes led to the dominance of functional group D, MP and P. Additionally, climate warming and nutrient enrichment led to increased diatom functional group diversity, while increased water depth (led by damming and reservoir reinforcement) contributed to diversity loss around 1957 and 1990 AD, respectively.