广东省北江流域河流有机碳浓度历史重建

根据河流颗粒有机碳浓度(CPOC)、溶解有机碳浓度(CDOC)与河流总悬浮物含量(CTSS)和流量(Q)的关系,构建广东省北江流域河流有机碳浓度估算模型分别为:CPOC=0.0195×CTSS+0.0589和CDOC = 0.0047×CTSS+0.0027×Q+0.9087.由上述模型重建了北江流域河流有机碳浓度变化历史,结果发现,北江流域河流有机碳主要以颗粒有机碳形式存在;年内分布表现为汛期高于平水期;年际变化多样,但总体上均表现出下降趋势;空间分布上表现为自上游往下有机碳浓度有所下降,但在三水站有所回升.

Reconstruction of the historical change of organic carbon concentrations in Beijiang River Drainage, Guangdong Province

Based on correlations between current organic carbon concentrations, sediment concentrations(CTSS) and runoff depth(Q), the estimating models for particulate organic carbon concentrations(CPOC)and dissolved organic carbon concentrations (CTSS)in Beijiang River Drainage, Guangdong Province were reconstructed as CPOC=0.0195×CTSS+0.0589 and CDOC = 0.0047×CTSS+0.0027×Q+0.9087, respectively. The results of organic carbon reconstruction indicated that the major form of organic carbon in Beijiang River Drainage was POC. For intra-annual distribution, the concentrations of DOC and POC in all hydrological stations investigated were the highest in flood period. Downward trends were detected in general for inter-annual dynamics. For spatial distribution, the concentrations of DOC and POC decreased from upper reaches to lower reaches except for Sanshui where the concentrations of DOC and POC started to increase.