摘要
在博斯腾湖选取了13个点位,于2012年5、8、10月测定表层和底层水体中的颗粒有机碳、溶解有机碳、颗粒有机氮和叶绿素a含量.结果显示颗粒和溶解有机碳在表层水体中的浓度与底层相近.博斯腾湖水体中颗粒有机碳的季节变化十分明显,其平均浓度从春季(0.64 mg/L)到夏季(0.71 mg/L)变化不大,但在秋季变化十分显著(浓度达1.58 mg/L).其中西北湖区和湖心区颗粒有机碳的季节变化最明显,东部湖区颗粒有机碳的季节变化相对较小.博斯腾湖水体的颗粒有机碳在春、秋两季主要来自外源输入,在夏季受水体中浮游生物的影响较大.博斯腾湖水体中溶解有机碳也具有一定的季节变化,夏季浓度(平均为9.3 mg/L)略低于春、秋两季(平均为10.3 mg/L).溶解有机碳在河口区的季节变化最强,其夏季浓度明显偏低,主要是由于开都河河水的稀释作用.总体上,博斯腾湖水体中溶解有机碳浓度的变化主要受外部因素的影响.
In this paper, we evaluated the seasonal variations of particulate and dissolved organic carbon and explored their sources in Lake Bosten. Water samples were collected at 13 sampling sites during May, August and October in 2012, Particulate organic carbon（ POC ）, dissolved organic carbon（ DOC ）, particulate organic nitrogen （ PON ） and chlorophylla concentrations were analyzed. On average, the POC concentration in the autumn（ 1.58 mg/L） was 2.2 times and 2.5 times of that in the summer（0.71 mg/L） and spring（0.64 mg/L）, respectively. Larger seasonal variation of POC was found in the northwest and central areas whereas eastern lake revealed relatively small seasonal variation of POC. External sources were responsible for the variability of POC in the spring and autumn, but plankton made a considerable contribution to POC in the summer. Overall, the concentration of DOC was lower in the summer than that in the spring and autumn. The average DOC concentration for the whole lake was about 10.3 mg/L in the spring and autumn and 9.3 mg/L in the summer. Unlike POC, DOC showed the largest seasonal change in the river mouth and the smallest change in the central area of the lake. The contribution of allochthonous organic carbon to DOC was probably much bigger than that of autochthonous organic carbon in Lake Bosten.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2014年第4期552-558,共7页
Journal of Lake Sciences
基金
中国科学院"百人计划"项目(0972021001)
国家重点基础研究发展计划"973"项目(2010CB951001)联合资助
关键词
颗粒有机碳
溶解有机碳
季节变化
博斯腾湖
来源
Particulate organic carbon
dissolved organic carbon
seasonal variation
Lake Bosten
source
