【摘要】：通過三維熒光光譜(3DEEM)和紫外吸收光譜(UV-vis)技術(shù)結(jié)合平行因子分析法(PARAFAC),研究了沉水植物黑藻死亡過程中葉、莖腐解釋放DOM的特性,進(jìn)一步揭示草型湖泊中水生植物腐解對水體的影響機(jī)制.結(jié)果表明,黑藻葉比莖腐解地更快,釋放出更多的TN、TP,烘干處理減緩了葉和莖中TN的釋放(P0.05),對TP的釋放無明顯影響(P0.05).采用平行因子分析法鑒別出葉中含有1種類蛋白質(zhì)組分C1和2種類腐殖酸組分C2、C3,莖中含有2種類蛋白質(zhì)C1、C3及2種類腐殖酸組分C2、C4.腐解前期(0~40d)DOM中類蛋白物質(zhì)占主導(dǎo)地位,且葉與莖中類蛋白質(zhì)含量比值約為1:1.5,此時水中DO偏低,DOC和NH_3-N含量升高,腐解中期(40~60d)類蛋白和類腐殖酸組分共同作用,腐解后期(60~90d)以類腐殖質(zhì)為主,且葉與莖中類腐殖質(zhì)含量比值約為1:1,此時電導(dǎo)率、TN和PO_4-P含量明顯升高,腐解釋放DOM可能影響水體的DO和pH值.
[Abstract]:Three dimensional fluorescence spectroscopy (3DEEM), ultraviolet absorption spectroscopy (UV-vis) and parallel factor analysis (PARAFAC),) were used to study the release of DOM from stem decay during the death of submerged plant black algae. The mechanism of aquatic plant decomposition on water body in grassy lakes was further revealed. The results showed that the decomposition of black algae leaves was faster than that of stems, and the release of TN,TP, from leaves and stems slowed down the release of TN from leaves and stems (P 0.05), but had no significant effect on the release of TP (P 0.05). Parallel factor analysis was used to identify 1 kind of protein component C1 and 2 kinds of humic acid component C _ 2, C _ 3, 2 kinds of humic acid component C _ 2, C _ 4 in stem, 2 kinds of protein C _ 1, C _ 3 and 2 kinds of humic acid component C _ 2, C _ 4. In the early stage of decomposition (0 鈮，

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