Spatio-temporal distribution and influencing factors of stable carbon and nitrogen isotopes of phytoplankton in Dianchi Lake
CHEN Rong1,2, WANG Ming-guo3,4, HUANG Lin-pei1, GUO Wen1, LI Rui1, WANG Jiao-yuan5, CHEN Guang-jie1
1. Yunnan Key Laboratory of Plateau Geographic Processes and Environmental Change, Faculty of Geography, Yunnan Normal University, Kunming 650500, China; 2. State Key Laboratory of Humid Subtropical Mountain Ecology Cultivation Base, School of Geography, Fujian Normal University, Fuzhou 350007, China; 3. Yunnan Institute of Geological Sciences, Kunming 650501, China; 4. Yunnan Institute of Geology and Mineral Surveying and Mapping, Kunming 650218, China; 5. Huaiyin Normal University, Huaian 223300, China
Abstract:A comparative study of δ13C and δ15N values of phytoplankton in Dianchi during the dry, transitional and rainy seasons showed that the δ13C and δ15N levels of phytoplankton were characterized by significant spatial and temporal fluctuations. During the dry, transitional and rainy seasons, the δ13C of phytoplankton were respectively at -20.44‰±0.72‰, -17.32‰±1.09‰ and -15.92‰±1.74‰, showing a gradually increasing trend. However, the opposite trend was recorded for the seasonal variation of δ15N levels in phytoplankton, because in rainy season the level was significantly lower (13.55‰±0.85‰) than in the transitional period (15.02‰±1.12‰), and in the dry season (15.02‰±1.12‰). The average of the spatial distribution of the δ13C levels in phytoplankton is 13.17‰, with an upper level in the south basin and a lower level in the north basin. For the δ15N levels of spatial distribution in phytoplankton, the average was 11.37‰, with a high value n the central basin and lower values in the southern and northern basins of the lake. About the level influencing factors, the statistical analyses showed that the δ13C value of phytoplankton in Dianchi was strongly related to multiple factors such as water temperature, precipitation, electrical conductivity and pH value, indicating that δ13C level of phytoplankton was significantly affected by cell growth rate and inorganic carbon sources. The seasonal variation in the δ15N values of phytoplankton in the lakes was mainly related to precipitation, and to the total nitrogen, and total phosphorus levels in the waters. The spatial variation in the δ15N was consistent with the spatial pattern of catchment land uses in Dianchi. This indicated that urban domestic sewage still remains an important pollution source of Dianchi, while agricultural fertilizer and other non-point source pollution played an important role in modulating both spatial and temporal variation of the phytoplankton δ15N levels. Therefore, spatial patterns of land use and seasonal variations in precipitation, were importantly affecting the ecosystem nutrient cycling and isotopic levels in the biota of the Dianchi lake.
陈蓉, 王明果, 黄林培, 郭雯, 李蕊, 王教元, 陈光杰. 滇池浮游植物碳氮同位素时空分布特征及其影响因子分析[J]. 中国环境科学, 2022, 42(2): 843-853.
CHEN Rong, WANG Ming-guo, HUANG Lin-pei, GUO Wen, LI Rui, WANG Jiao-yuan, CHEN Guang-jie. Spatio-temporal distribution and influencing factors of stable carbon and nitrogen isotopes of phytoplankton in Dianchi Lake. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 843-853.
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