安徽龙河口水库沉积物碳、氮、磷地球化学记录及其环境意义

THE GEOCHEMICAL RECORDS OF C-N-P AND ENVIOROMENTAL IMPLICATOINS IN RECENT SEDIMENTS OF LONGHEKOU LAKE

根据2004年在安徽龙河口水库采得的沉积物样芯以及上游三条主要河流的流域表层样品,对其有机碳、氮、磷含量以及其他气候代用指标进行了分析。研究发现晓天河流域样品有机碳、氮含量最高,柱样中各元素含量随深度增加缓慢变小,但在50cm深度有明显峰值出现。同时对沉积物中碳-氮和氮-磷耦合关系进行了讨论,推断其物质来源以河流携带陆源植物输入为主。其含量变化受物质来源、本身生物化学作用、人类活动等影响。

In this paper, the content of OC, Nitrogen and Phosphorus, together with other climate proxy analysis from core ALE in Longhekou Lake and surface sediments in the valley were studied. The result showed that the content of OC and N in Xiaotian river is highest among the three rivers, the vertical distribution of C-N-P in core ALE tends to decrease from surface to bottom,with high peak appearing in 50cm. The relation of OC and N, OC and P were discussed. There is an obvious positive correlation between OC and N, but the correlation of OC and P is not excellent. The C/N and C/P ratio and other characteristics suggest that organic matters in the sediments mainly originate continental plants through Xiaotian river. The change of these characters was the result of climate changes, anthropogenic activities, different material inputting; different speed of decomposition and so on.