高山湖泊吉仁錯(cuò)枝角類古生態(tài)變化及其對(duì)氣候環(huán)境的響應(yīng)
[Abstract]:Jiren, a high mountain lake, is located above the tree-line of western Sichuan Plateau and is affected by modern glacial melt water supply. By means of ~ (210) Pb/~ _ (137) Cs dating and multi-environmental proxy index analysis of Jiren fault sedimentary borehole, principal component analysis and redundancy analysis were used. The high resolution reconstruction of the assemblage and environmental change of Khiren in the past 200 years has been carried out. The results showed that, although the assemblage was dominated by coastal species in the past 200years, it still underwent three distinct stages of change. After 1850 AD, Alonella nana,Chydorus sphaericus and Pleuroxus sp. in the Cladocera combinations were observed. The increase of Alona rustica and Alona guttata abundance indicated the increase of water temperature and pH value of water body. The increase of Cladocercus flux after 1900 AD did not synchronize with the change of combination, which indicated that the nutrition of lake began to increase. This inconsistent change represents the effects of atmospheric nitrogen deposition and regional warming, respectively. In the past 150 years, direct and indirect effects (river basin glacier melting process and vegetation-soil process) between climate change and air pollution deposition have been obtained by comprehensive analysis of multiple indicators. The physical processes of lakes (water temperature rise and non-glacial period lengthening), nutrient processes (nitrogen and phosphorus nutrition increasing) and acid-base balance processes (alkalinity enhancement) have changed the growing season of lake organisms, and by promoting algae development, The changes of community combination and biomass of Cladocera were finally caused by the synchronous change of community structure and lake environment of Artemisia and algae before and after 1945 AD, which responded to the interaction of multi-environment process under the background of continuous warming.
【作者單位】: 中國(guó)科學(xué)院南京地理與湖泊研究所湖泊與環(huán)境國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFA0600500) 國(guó)家自然科學(xué)基金項(xiàng)目(41272379)聯(lián)合資助
【分類號(hào)】:P467;Q915
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