CAJ | 학술논문

通过对东、西辽河和辽河干流有色溶解有机物(CDOM)吸收特性和荧光特征以及溶解有机碳(DOC)浓度的分析,对比研究不同子流域CDOM的光学特性差异,并分析影响CDOM与DOC浓度的主要因素.对比研究发现,辽河干流CDOM与DOC相关性(R = 0.89,P < 0.01)高于西辽河(R = 0.81)与东辽河(R = 0.75).总悬浮物浓度(TSM)和总碱度与不同子流域CDOM/DOC相关性较高.不同流域内CDOM与DOC的浓度变化较大,西辽河 CDOM 和 DOC 浓度明显高于东辽河和辽河干流.流域内土地利用、气候条件对两者浓度的影响显著,林地和CDOM及DOC浓度存在显著负相关(R =-0.41,-0.56),即林地面积越大,CDOM和DOC浓度越低;而农田与两者存在正相关(R = 0.40, 0.32),农田面积越大,相应的CDOM和DOC浓度越高;降雨量与CDOM和DOC呈现明显的负相关(R =-0.53,-0.38),说明降雨对河流CDOM的稀释作用较大.对于CDOM荧光强度Fn(355)与CDOM浓度来说,在每个子流域两者均存在较好的相关性,特别是西辽河流域(R = 0.96,P < 0.01).CDOM的三维荧光光谱发现,东、西辽河及辽河干流均表现出较强的类腐殖酸荧光峰(A峰和C峰),同时辽河干流表现出很强的类蛋白质峰(T峰).CDOM的吸收斜率(S)以及基于荧光光谱的FI和HIX表明东、西辽河和辽河干流CDOM的主要来源是外源高等植物输入的大分子量DOM,但是,西辽河和辽河干流CDOM的分子量要小于东辽河CDOM组成物质.
통과대동、서료하화료하간류유색용해유궤물(CDOM)흡수특성화형광특정이급용해유궤탄(DOC)농도적분석,대비연구불동자류역CDOM적광학특성차이,병분석영향CDOM여DOC농도적주요인소.대비연구발현,료하간류CDOM여DOC상관성(R = 0.89,P < 0.01)고우서료하(R = 0.81)여동료하(R = 0.75).총현부물농도(TSM)화총감도여불동자류역CDOM/DOC상관성교고.불동류역내CDOM여DOC적농도변화교대,서료하 CDOM 화 DOC 농도명현고우동료하화료하간류.류역내토지이용、기후조건대량자농도적영향현저,임지화CDOM급DOC농도존재현저부상관(R =-0.41,-0.56),즉임지면적월대,CDOM화DOC농도월저;이농전여량자존재정상관(R = 0.40, 0.32),농전면적월대,상응적CDOM화DOC농도월고;강우량여CDOM화DOC정현명현적부상관(R =-0.53,-0.38),설명강우대하류CDOM적희석작용교대.대우CDOM형광강도Fn(355)여CDOM농도래설,재매개자류역량자균존재교호적상관성,특별시서료하류역(R = 0.96,P < 0.01).CDOM적삼유형광광보발현,동、서료하급료하간류균표현출교강적류부식산형광봉(A봉화C봉),동시료하간류표현출흔강적류단백질봉(T봉).CDOM적흡수사솔(S)이급기우형광광보적FI화HIX표명동、서료하화료하간류CDOM적주요래원시외원고등식물수입적대분자량DOM,단시,서료하화료하간류CDOM적분자량요소우동료하CDOM조성물질.
Comparative analyses about the differences of optical characteristics and composition of riverine waters in the East/West tributaries and the stem of Liaohe River were conducted and the influenced factors impacting on chromophoric dissolved organic matter (CDOM) and dissolve organic carbon (DOC) in different sub-watersheds were examined based on the absorption and fluorescent optical properties. Relationship between CDOM absorption and DOC concentration in the stem of Liaohe River exhibited the best (R= 0.89,P < 0.01) compared with that in the East Liaohe River (R= 0.75) and the West Liaohe River (R= 0.81). Close relationships between two water qualities (total suspended matter [TSM] and total alkalinity) and ratios of CDOM and DOC (CDOM/DOC) were obtained in this investigation. CDOM and DOC concentrations showed great variability in different sub-watersheds. CDOM and DOC concentrations in West Liaohe River were higher than that in East and the stem of Liaohe River. Land use/cover and climate conditions exerted great influences on CDOM and DOC. Significant negative correlations were obtained between forest area and CDOM and DOC, with theR =-0.41 and-0.56respectively. Positive correlations were observed between cropland area and CDOM and DOC (R = 0.40 for CDOM andR =0.32 for DOC). Furthermore, negative correlations were obtained between precipitations and CDOM and DOC, with theR =-0.53 and-0.38 respectively, which demonstrated that dilute effect of rainfall exhibited great influence on CDOM and DOC concentrations. Moreover, relationships between Fn (355) and CDOM absorption in different sub-watersheds showed strong correlations, especially in the West Liaohe River (R = 0.96,P < 0.01). All the samples exhibited fairly strong humic-like fluorophore (fluorophore A and fluorophore C) in the fluorescence excitation-emission matrices (EEMs). Meantime, samples in the main stem of Liaohe River showed strong protein-like fluorophore (fluorophore T). Main sources of CDOM in the studied rivers were terrestrial (allochthonous) origins, which showed the high weight molecular substances based on theS, FI and HIX values. However, molecular weights in West Liaohe River and the main stem of Liaohe River were inclined to be lower than that in the East Liaohe River.