Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, Qinghai, China.
Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Xining, 810008, Qinghai, China.
Arch Environ Contam Toxicol. 2019 May;76(4):528-539. doi: 10.1007/s00244-018-00595-5. Epub 2019 Jan 4.
Black carbon (BC), ubiquitous in soils, plays an important role in global carbon cycles, the radiative heat balance of the Earth, pollutant fate, emissions of greenhouse gas, soil fertility, soil microbial community, and ecosystem stability. However, information on BC in topsoils of the northeastern Qinghai-Tibet Plateau is limited. Therefore, this study performed field sampling and analyzed contents of total BC and soot BC in topsoils. The results indicated that the contents of total BC in all soil samples ranged from 0.504 to 74.381 g kg with an average value of 5.152 g kg, whereas those of soot BC were in the range of 0.400-15.200 g kg with a mean value of 1.719 g kg. Contents of BC were significantly correlated with those of total carbon and total organic carbon. Soil types affected the distribution of soil BC. The contents of total BC in the loam soils were larger than those in the clay soils, whereas soot BC was more easily enriched in the clay soils. Total BC was negatively correlated with Ca, and soot BC was negatively correlated with Ti. The contents of soil BC in functional areas, such as agricultural and pastoral areas, industrial areas, and mining areas, were significantly higher than those in other areas, illustrating that anthropogenic activities drastically affected the distribution of soil BC. This study exhibits the fundamental information on soil BC in the northeastern Qinghai-Tibet Plateau to provide important knowledge on global soil carbon sink.
黑碳（BC）广泛存在于土壤中，在全球碳循环、地球辐射热平衡、污染物归宿、温室气体排放、土壤肥力、土壤微生物群落和生态系统稳定性等方面发挥着重要作用。然而，青藏高原东北部表土中黑碳的相关信息有限。因此，本研究进行了实地采样，并分析了表土中总黑碳和烟尘黑碳的含量。结果表明，所有土壤样品中总黑碳的含量范围为 0.504 至 74.381 g kg，平均值为 5.152 g kg，而烟尘黑碳的含量范围为 0.400 至 15.200 g kg，平均值为 1.719 g kg。BC 含量与总碳和总有机碳含量显著相关。土壤类型影响土壤 BC 的分布。壤土中总黑碳的含量大于粘土中总黑碳的含量，而烟尘黑碳更容易在粘土中富集。总黑碳与 Ca 呈负相关，烟尘黑碳与 Ti 呈负相关。农业和牧区、工业和矿区等功能区的土壤 BC 含量明显高于其他地区，表明人为活动极大地影响了土壤 BC 的分布。本研究展示了青藏高原东北部土壤黑碳的基本信息，为全球土壤碳汇提供了重要知识。
