CAJ | 학술논문

对太湖水体溶解有机质三维荧光光谱、紫外吸收系数、溶解性有机碳(DOC)、总氮和总磷的分布特征进行了研究,定量估算了溶解有机质的来源. 研究发现:太湖水体溶解有机质的各物理化学参数以及氮磷质量浓度的区域分布特征明显. 水体三维荧光光谱显示有2个特征的类蛋白荧光峰,但不同湖区水样荧光峰位置以及强度并不完全一致. ρ(DOC)和荧光强度[F_n(355)]与吸收系数(α)有显著的相关性,但其相关关系也存在明显的区域特征. 根据有机质光谱学和理化指标的分布特点、梯度变化规律及地理特征要素,将太湖分为4个区域(Ⅰ,Ⅱ,Ⅲ和Ⅳ区),讨论了各区域的特征和变化规律. 利用有机质来源与荧光光谱指数的定量关系,估算了溶解有机质的来源贡献率,结果显示,北部湖区城市污水、陆源和生物活动对DOM的来源均有影响,其他湖区DOM以生物作用为主,陆源贡献率均不超过25%.
대태호수체용해유궤질삼유형광광보、자외흡수계수、용해성유궤탄(DOC)、총담화총린적분포특정진행료연구,정량고산료용해유궤질적래원. 연구발현:태호수체용해유궤질적각물이화학삼수이급담린질량농도적구역분포특정명현. 수체삼유형광광보현시유2개특정적류단백형광봉,단불동호구수양형광봉위치이급강도병불완전일치. ρ(DOC)화형광강도[F_n(355)]여흡수계수(α)유현저적상관성,단기상관관계야존재명현적구역특정. 근거유궤질광보학화이화지표적분포특점、제도변화규률급지리특정요소,장태호분위4개구역(Ⅰ,Ⅱ,Ⅲ화Ⅳ구),토론료각구역적특정화변화규률. 이용유궤질래원여형광광보지수적정량관계,고산료용해유궤질적래원공헌솔,결과현시,북부호구성시오수、륙원화생물활동대DOM적래원균유영향,기타호구DOM이생물작용위주,륙원공헌솔균불초과25%.
Based on analysis of three-dimensional excitation emission matrix fluorescence spectroscopy (3DEEM),UV-absorption coefficient,dissolved organic carbon concentrations of dissolved organic matter (DOM) and distribution characteristic of total nitrogen and total phosphorous,the origins of dissolved organic matter (DOM) in the water of Taihu Lake were quantitatively estimated.Results show that the physico-chemical parameter of DOM,total nitrogen and total phosphorus content varied much in spatial distribution.3DEEM of DOM in aquatic environments have two main fluorescence peaks: peak B and peak S.Both peaks referred to protein-like fluorescence,and the fluorescence intensity and location was different in spatial distribution.Both DOC concentration and F_n(355) showed strong correlation with absorption coefficient at 254 nm,but the correlation varied in spatial distribution.According to the spectroscopy of DOM,the distribution characteristic and gradient variation of the physico-chemical parameter and the geographical characteristic,Taihu Lake was divided into four regions (regionⅠ,Ⅱ,Ⅲ and Ⅳ).We applied a fluorescence index to quantitatively determine the proportion of the origin of DOM.The sources of DOM in the north of Taihu Lake include municipal sewage,terrestrial nature and biological activity; however,DOM in other parts of Taihu Lake is mainly rooted in biological activity.The contribution of terrestrial nature was less than 25%.