本文選題：洱海水-陸界面 + 溶解性有機氮�。� 參考：《光譜學與光譜分析》2017年04期

【摘要】：利用紫外與三維熒光光譜技術(shù),研究了洱海水-陸界面溶解性有機氮(DON)組成結(jié)構(gòu)及生物有效性特征,并探討了其對湖泊水質(zhì)影響。結(jié)果表明:(1)水-陸界面經(jīng)由永安江輸入洱海DON濃度在0.25~1.39mg·L~(-1)之間,從河流到湖內(nèi)以夏秋兩季DON濃度較高;經(jīng)由永安江輸入洱海DON負荷量在0.48~2.34t之間,其中以夏季DON負荷量最高,表明經(jīng)由入湖河流輸入洱海的DON對洱海水質(zhì)影響潛在風險較大,尤其夏季明顯。(2)水-陸界面經(jīng)由永安江輸入洱海的DON組成主要以類腐殖質(zhì)物質(zhì)為主,永安江沿程到湖內(nèi)衰解特征明顯且生物有效性為15.27%,而類蛋白和可溶性微生物代謝產(chǎn)物則出現(xiàn)不同程度累積,累積率分別為42.00%和20.68%;DON組分的分子腐殖化程度經(jīng)由永安江到洱海湖內(nèi)呈漸降趨勢且降低了14.97%。同時,分子芳香環(huán)取代基從以脂肪鏈為主逐漸向以羰基、羧基、羥基、酯類為主轉(zhuǎn)變,尤其在夏季表現(xiàn)明顯。(3)水-陸界面經(jīng)由永安江輸入洱海DON組成特征參數(shù)(P_((Ⅲ+Ⅴ,n))/P_((Ⅰ+Ⅱ,n))和A_(253)/A_(203)值)與其不同形態(tài)氮含量顯著相關(guān)(R~2=0.64~0.74,P0.1,P0.05),即永安江輸入洱海DON結(jié)構(gòu)影響其生物有效性;水-陸界面DON不同結(jié)構(gòu)特征參數(shù)與水質(zhì)呈顯著正相關(guān)(R=0.82~0.96,p0.05,p0.01),表明水-陸界面經(jīng)由永安江入湖DON組成結(jié)構(gòu)及生物有效性對洱海水污染有一定貢獻,尤其在夏季受陸源等人類活動影響較大時,影響更為突出;由此可見,洱海水-陸界面經(jīng)由永安江入湖DON組成結(jié)構(gòu)變化(如P_((Ⅲ+Ⅴ,n))/P_((Ⅰ+Ⅱ,n)),A_(253)/A_(203))可在一定程度上反映洱海水質(zhì)狀況。
[Abstract]:The composition and bioavailability of dissolved organic nitrogen (DON) at the water-land interface of Erhai Lake were studied by means of UV and 3D fluorescence spectroscopy, and the effects of DON on lake water quality were also discussed.The results show that the DON concentration of Erhai Lake is higher in summer and autumn from river to lake at the water-land interface, and the DON load of Erhai Lake input through Yongan River is between 0.48 and 2.34 t, in which the DON load in summer is the highest.The results show that the potential risk of DON input into Erhai Lake from lake river is great, especially in summer.) the composition of DON input from the water-land interface to Erhai Lake via Yongan River is mainly humus-like material.The characteristics of senescence and bioavailability from Yongan River to the lake were 15.27, while protein like and soluble microbial metabolites accumulated in varying degrees.The accumulation rates of 42.00% and 20.68% of don components showed a decreasing trend and a decrease of 14.97% through the Yongan River to Erhai Lake.At the same time, the molecular aromatic ring substituents gradually changed from fatty chain to carbonyl, carboxyl, hydroxyl and ester.Especially in summer, the water-land interface input the characteristic parameter of DON composition of Erhai Lake via the Yongan River (鈪，

本文編號：1746675