摘要
研究了总氮NT、总磷PT、重金属Cu,Zn,Pb和Cd在崇明东滩湿地沉积物中的分布与累积特征。结果表明,NT和重金属表现为:芦苇带>互花米草带>海三棱镳草带>光滩,即从光滩至芦苇带,从南部至北部,NT和重金属的质量分数呈现逐步增加的趋势。由于高潮带以细颗粒为主,有机质含量较高,因此NT和重金属表现出相应的富集;而沉积物PT在各个潮带呈均匀分布,这主要与沉积物中磷的化学形态组成有关。与上海南岸潮滩湿地和世界其他河口湿地相比,东滩湿地沉积物中重金属的质量分数相对较低,表明它是一块保存较为完好未受到污染的天然湿地,这主要与长江径流对污染物的稀释作用有关。
In this study, the total nitrogen （NT）, total phosphorus （PT） and heavy metals（Cu, Zn, PB and Cd） were measured in the sediment of Chongming dongtan wetland. The distribution and accumulation of nutrients and heavy metals in the sediment are elucidated. The result shows distribution and accumulation of NT and heavy metals are very similar, namely Phragmites australis zone〉Spartina alterniflora zone〉 Scirpus rnariqueter zone〉mudflat. There is an increasing trend from mudflat to high tidal flat and from south to north in the dongtan wetland sediment. Grain size is the main factor of controlling the distribution and accumulation of nutrients and heavy metals in the sediment. But PT is very evenly distributed in the different elevated tidal flats, which is related to the chemical formation of phosphorus in the sediment. But compared with southern tidal wetland of Shanghai city and other world estuarine wetland, the heavy metals pollution is relatively moderate in dongtan wetland, which shows the dongtan wetland is non-polluted natural wetland. This is related to the diluting effects of the huge volume of runoff from the Changjiang River.
出处
《海洋科学》
CAS
CSCD
北大核心
2008年第6期89-93,共5页
Marine Sciences
基金
国家自然科学基金重点项目(50339040)
关键词
长江口湿地
养分
重金属
分布
累积
Changjiang estuary wetlands
nutrient
heavy metals
distribution
accumulation
