北极新奥尔松(Ny-lesund)地区环境中有机碳组成来源的初步分析

对2010年8月从北极新奥尔松地区(Ny-lesund)中国黄河站附近所采集的土壤、沉积物和苔藓进行整体指标OC%,TN%,δ13C(‰)]和木质素(lignin-derived phenols)分析;并对土壤和沉积物进行粒度分析。结果显示OC%与TN%具有相同的来源;但是粒度并不是控制有机物分布的主要因素。数据显示当地木质素主要来自当地的维管植物和苔藓,但是可能会受到当地动物或者微生物的影响。木质素的降解参数(Ad/Al)v值的大小顺序为沉积物土壤苔藓,可能是由于苔藓的表面吸附了细颗粒的煤炭,但是缺少14C数据,无法定量计算煤炭对环境中有机碳的贡献;另外一个降解参数肉桂基酚类两种单体(CAD/FAD)比值由苔藓、土壤、沉积物依次降低,反映出成岩作用增强,木质素降解程度增加。综合OC%、TN%、δ13C(‰)和木质素数据,中国北极黄河站周围环境中的有机碳来源主要为当地的苔藓和维管植物,也有可能吸附了一些煤颗粒,但是由于技术手段的限制,煤炭的贡献在当前的数据解析下无法定量评估。

THE COMPOSITION AND SOURCE OF ORGANIC CARBON AROUND YELLOW RIVER STATION IN NY-ÅLESUND,THE ARCTIC

Samples ofsoils, sediments, and two mosses around China’s Yellow River Station in the Arctic were collected in August 2010. The samples were analyzed for grain size, organic carbon content (OC%), total nitrogen (TN%), isotope of organic carbon (δ¹³C (‰)), and lignin-derived phenols. The OC% and TN% in soil and sediment samples were linearly correlated (R²=1, p < 0.001), which indicated common sources. The grain size was not the main factor controlling the distribution of OC and TN. Data showed the source of lignin was mosses and non-woody vascular plants. The average degradation indictor (Ad/Al)v for all samples was 1.02. The results indicated that the addition of coal dust might lead to a higher (Ad/Al)v compared with fresh vascular plants. The ratio of CAD to FAD ranged from 0.55 to 4.01, and individual yields decreased from the mosses to the soils to the sediments. This pattern showed an increased digenetic characteristic. We concluded that the sources of organic carbon around Yellow River Station were moss and non-woody vascular plants, and the contribution of coal was difficult to distinguish.