辽河水体光学吸收特性的季节变化  

Absorption characteristics and seasonal variations of optically active water constituents from Liaohe River

作　　者：邵田田[1,2] 宋开山[1] 丁智[3] 赵莹[1] 王铭[1] 杜嘉[1] 张柏[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所,长春130102 [2]中国科学院大学,北京100049 [3]中国科学院地理科学与资源研究所,北京100101

出　　处：《生态学报》2016年第7期1861-1871,共11页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划项目(2013CB430401);国家自然科学基金项目(41471290)

摘　　要：吸收特性是水体重要的光学特性,也是建立生物光学模型的基本参数。利用2013年5月和9月辽河流域水体实测数据对总悬浮颗粒物、浮游植物、非藻类颗粒物以及有色溶解有机物(CDOM)的吸收特性、季节变化进行了研究。研究表明,总颗粒物的吸收光谱曲线与非藻类颗粒物的吸收光谱基本保持一致并且与非藻类颗粒物的吸收[a_d(λ)]以及浮游植物的吸收[a_(ph)(λ)]都呈现显著相关。两个季节,a_d(440)均是总吸收的主要组成部分,CDOM的吸收[a_(CDOM)(440)]则大于a_(ph)(440)的贡献率,但9月a_d(440)的吸收所占比例较5月高。辽河水体非藻类颗粒物中矿物颗粒物的含量较其他一般水体要高。通过分析5月及9月的aph(440)/a_(ph)(675)发现浮游植物中辅助色素与叶绿素a浓度(Chla)的组成季节性变化不大,但其空间特征表现较为明显。另外,CDOM的吸收特性与非藻类颗粒物的吸收相似,呈现出较大的空间差异性;辽河S_(CDOM)基本小于其它河流、湖泊、河口等水体,其CDOM主要由大分子物质组成。The absorption characteristics of optically active constituents（ OACs） in water column are important optical properties and key parameters for bio-optical modeling. Inherent optical properties（ IOPs） of OACs are mainly determined by three components,i.e.,the spectral absorption of non-algal particles,phytoplankton and chromophoric dissolved organic matter（ CDOM）. Spectral absorption properties,seasonal and spatial variability of particulates（ total suspended matters（ TSM）,including phytoplankton and non-algal particles） and CDOM absorption characteristic were analyzed from water samples collected in May and September 2013,respectively. Compositions of CDOM and non-algal particles were also examined at the same time. The results demonstrated that most absorption curves of the total suspended particulate [ap（ λ） ]were similar to non-algal particles absorption [ad（ λ） ],showing great variations along the Liaohe River observed at the same time. Significant correlations were obtained between ap（ λ） and ad（ λ）,especially the correlations between ap（ 440）and ad（ 440）（ R= 0.99 both in May and September）. Meanwhile,strong relationships between ap（ λ） and the absorption of phytoplankton [a（ph）（ λ） ]were exhibited at 675 nm,with correlation coefficient（ R） = 0. 81 in May and R = 0. 55 in September,respectively. Moreover,close relationships between apand TSM at both 440 and 675 nm were revealed while significant correlations were obtained between ap（ 675） and chlorophyll a（ Chla） for samples collected in both seasons.According to our investigation,no significant relationships were exhibited between ap（ λ） and dissolved organic carbon（ DOC）. A close relationships between ap（ λ） and inorganic suspended particulate（ ISM） and organic suspended particulate（ OSM） were recorded in September,while it was not the case for samples in May. Significant correlations were also yielded between CDOM and DOC concentration for samples collected

关 键 词：辽河 吸收特性 颗粒物 CDOM 季节变化 

分 类 号：P341[天文地球—水文科学]