Diatom Response to Global Warming in Douhu Lake,Southeast China  

作　　者：LI Jingjing WANG Luo CAO Qi Patrick RIOUAL LEI Guoliang CAI Binggui ZHANG Jiaoyang ZOU Yafei YAN Yao WAN Xiaoqiao XIAO Jule 

机构地区：[1]School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China [2]Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [3]School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China [4]CAS Center for Excellence in Life and Paleoenvironment,Beijing 100044,China [5]Key Laboratory of Humid Subtropical Ecogeographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350007,China [6]Institute of Geography,Fujian Normal University,Fuzhou 350007,China [7]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第2期638-647,共10页地质学报（英文版）

基　　金：funded by a granted from National Key R&D Program of China(Grant No.2017YFA0603400);the National Basic Research Program of China(Grant No.2015CB953801);the National Natural Science Foundation of China(Grant No.41772379)。

摘　　要：A large number of lacustrine sedimentary records indicate that global warming is the main factor leading to significant changes in diatom communities in lakes of the northern hemisphere.However,due to the intensification of human activities since 1850,some scholars have emphasized that the increasing lake trophic level may be the main reason for the changes in diatom communities.The debate is ongoing.In order to avoid falling into the complex relationship between diatom changes and the seasonal cycle that characterizes lakes in mid and high latitudes,we chose a lake located at a low latitude,where the relationship between diatoms and temperature is not indirect but direct.The diatom record spans the past ca.100 years and reveals that the abundance of Aulacoseira granulata increased from 1900 until 1985,replacing the previously dominant Aulacoseira ambigua.These changes are in agreement with the increasing trend in global temperature.Since 1985,the percentages of the small-celled Discostella stelligera and the benthic diatom Navicula heimansioides have increased,while Aulacoseira granulata has decreased.This latest shift is caused by further global warming.We conclude that warming is the main factor leading to changing diatom communities in Douhu Lake.

关 键 词：DIATOM global warming Douhu Lake China 

分 类 号：P467[天文地球—大气科学及气象学] Q948.8[生物学—植物学]