Abstract：The blooming process of Skeletonema Costatum in Chongming North Lake, a brackish lake in the Yangtze Estuary was simulated. Spectral characteristics variations of dissolved organic matter (DOM) during the blooms were studied by analysis on the UV-visible absorption spectra (a355) and three dimensional fluorescence excitation-emission matrix (3DEEM). Absorption coefficients increased during the blooms and seven fluorophores representing for protein-like and humic-like components of DOM were found. The fluorescence increases of various fluorophores continued even though the algae began to die. Significant linear relationships were found between dissolved organic carbon (DOC) concentrations and humic-like fluorescence intensities, and between absorption coefficients (a355) and humic-like fluorescence intensities. The protein-like fluorophores of high and low excitation appeared homogeneous. The increase of fluorescence index and protein-like fluorescence signal suggested that bacteria could play an important role in the production of chromophoric dissolved organic matter (CDOM). Compared with the results from experiment under germfree treatment, it was implied that microbe might turn the non-fluorescence matter produced by algae into CDOM.
朱晓敏, 黄清辉, 李建华. 咸水藻水华期溶解有机质光谱特征变化的模拟[J]. 中国环境科学, 2009, 29(1): 68-72.
ZHU Xiao-Min, HUANG Qing-Hui, LI Jian-Hua. A simulation on spectral characteristics variations of dissolved organic matter during the blooms of brackish-water algae. CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(1): 68-72.
