近50年来安徽杭埠河上游地球化学沉积与区域环境变化  

Sediments Record and the Catchment Environmental Changes in the Upper Reaches of the Hangbu River over the past 50 Years

作　　者：王立群[1] 张福瑞[2] 华珞[1] 张卫国[2] 顾成军[2] 

机构地区：[1]首都师范大学资源环境与旅游学院,北京100037 [2]华东师范大学,上海200062

出　　处：《首都师范大学学报（自然科学版）》2008年第1期85-91,共7页Journal of Capital Normal University：Natural Science Edition

基　　金：长江下游区域人类活动对流域环境影响的沉积记录研究(40271107);中英国际合作项目

摘　　要：2003年在安徽杭埠河上游的龙河口水库采得的沉积物ALE柱样及上游三条主要河流的流域表层样品,在利用SCP记录确定沉积年份的基础上,对其粒度、有机碳、氮、磷含量等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50 cm深度有明显峰值出现.同时对近50年以来沉积物中粒度变化、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、气候变化、人类活动等影响,并进一步揭示该区域环境变化的不同阶段,发现降雨和人类活动是影响本流域沉积的主要因素.In this paper, the content of grain size, OC, Nitrogen and Phosphorus, together with other climate proxy analysis from core ALE in Longhekou Lake of Hangbu River catchment and surface sediments in the valley were studied. The result showed 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 tend to decrease from surface to bottom, with high peak appearing in 50cm. The relation of OC and N, OC and P were discussed in the paper. There is an obvious positive correlation between OC and N, but the correlation of OC and P was not excellent. The C/N and C/P ratio and other charace-ristics suggest that organic matters in the sediments mainly originated continental plants through Xiaotian river. The change of these characters was the result of climate changes, anthropogenicactivifi-es, different material inputting; different speed of decomposition and so on.

关 键 词：杭埠河 有机碳 地球化学 沉积物 环境变化 

分 类 号：P59[天文地球—地球化学]