在地球水生态系统中，颗粒态黑碳(particulate black carbon，PBC)是颗粒有机碳(particulate organic carbon，POC)的重要组成部分。采用热光反射法对黄石磁湖POC、PBC及其组分(焦炭和烟炱)的含量水平、空间分布特征及可能来源进行了研究。结果表明，磁湖水体中POC、PBC、焦炭(char)和烟炱(soot)含量变化范围分别为 2899。38-5622。80、235。01-800。08、24。41-310。23、130。09-544。72 μg·L-1，平均含量分别为3903。84、377。25、155。52、272。65 μg·L-1，呈现较大的空间分布差异。PBC/POC的变化范围在6。89％—18。32％之间，平均值为10。92％，说明城市湖泊水体中PBC对POC含量积累的贡献较大。soot/PBC的变化范围为45。92％—89。61％，平均值为63。95％。PBC、char与soot含量和PBC/POC比值的空间变异性与环湖周边区域的道路交通和工业布局有关，且南半湖受交通污染和工业排放的影响更大。PBC与POC、char和soot含量均呈正相关，且PBC与soot的相关系数(r=0。81，P＜0。01)高于char(r=0。72，P＜0。01)，说明磁湖水体中soot对PBC的贡献更大。char/soot比值分析结果表明，磁湖水体中PBC主要受到交通污染源和燃煤等人类活动的影响。
Spatial variation and sources of particulate black carbon in Cihu Lake in Southeast Hubei Province
Particulate black carbon(PBC)is an important component of particulate organic carbon(POC)in the Earth's aquatic ecosystem.The concentration levels,spatial distribution characteristics,and possible sources of POC,PBC,and their components(char and soot)in Cihu Lake of Huangshi City were investigated by using the thermal optical reflectance(TOR)method.The results showed that the concentrations of POC,PBC,char,and soot in the water bodies of Cihu Lake varied in the ranges of 2899.38-5622.80,235.01-800.08,24.41-310.23,and 130.09-544.72 μg·L-1,respectively,with a mean of 3903.84,377.25,155.52,272.65 μg·L-1,respectively,showing significant spatial differences.PBC/POC ranged from 6.89％to 18.32％,with an average value of 10.92％,indicating that the contribution of PBC to the accumulation of POC in Cihu Lake is greater.soot/PBC varied from 45.92％to 89.61％,with a mean value of 63.95％.The spatial variability of PBC,char,and soot concentration and PBC/POC ratio was related to the road traffic and industrial layout in the surrounding area of the lake,and the southern half of the lake was more influenced by traffic pollution and industrial discharge.PBC was positively correlated with POC,char,and soot content,and the correlation coefficient of PBC and soot(r=0.81,P＜0.01)was higher than that of char(r=0.72,P＜0.01),indicating that soot contributed more to PBC in Cihu Lake.The results of char/soot ratio analysis showed that PBC in the water body of Cihu Lake was mainly influenced by human activities such as traffic pollution and coal combustion.
water bodyparticulate organic carbonparticulate black carbondistributionsources
NETL
NSTL
万方数据
