长江口柱状沉积物中生源要素的地球化学特征

Geochemical characteristics of biogenic elements in core sediment from Changjiang River Estuary

长江口4个岩芯沉积物中不同形态生源要素的分布各不相同。有机氮和总氮在8号站位的含量远高于其他3个站位,而不同形态C、P的含量在不同站位间的差别不大。沉积物中生源要素的分布主要受生源要素的来源、水动力条件以及沉积环境等多种因素影响,沉积物粒度对柱状沉积物中生源要素分布的影响并不显著。有机生源要素的分解速率常数远大于中国近海其它海区,其中在水动力活跃的海区分解速率常数最大。沉积速率是控制生源要素埋藏通量的主要因素,在沉积速率较大的站位其埋藏通量相应较大,埋藏通量与沉积物中生源要素的含量关系不大。

The distributions of various forms of biogenic elements are different in four core sediments from the Changjiang Estuary.The contents of organic and total nitrogen are higher at site 8 than at other three sites,whereas,the contents of various forms of carbon and phosphorous are similar at four sites.The distribution of nutrient was mainly affected by the nutrient sources,hydrocarbon dynamics,and depositional conditions,but not by the sediment grain size.The decomposable velocity constant of organic nutrient...