北京市公园土壤黑碳含量特征及来源分析

发布时间：2018-07-26 13:56

【摘要】：通过对北京市五环内44个典型公园的表层土壤进行取样调查,测定了土壤有机碳(OC)和黑碳(BC)的质量分数,研究了土壤BC的分布特征,并分析了土壤OC和BC之间的相关关系及BC的可能来源。结果表明,北京市公园表层土壤OC质量分数范围为1.76~19.61 g·kg~(-1),平均值9.08 g·kg~(-1);BC质量分数相对较低,变化范围为0.46~6.25 g·kg~(-1),平均值2.16 g·kg~(-1)。土壤OC和BC之间存在极显著正相关关系(r=0.788,P0.01),表明BC组分对土壤固碳和有机质累积具有重要作用,BC对北京市公园土壤有机质含量增高的贡献不可忽略。北京市五环内公园土壤的w(BC)/w(OC)均值为0.23,反映了BC主要来源为生物质和化石燃料燃烧共同作用的结果。总体上,四环和五环附近公园土壤的w(BC)/w(OC)值(0.23和0.19)略低于三环和二环以内的公园土壤(0.26),但Kruskal-Wallis非参检验结果显示,除了三环和五环公园外,其他不同环线附近公园土壤的w(BC)/w(OC)值并无显著性差异,总体较为接近,表明城市公园土壤的BC来源呈现类似的特征。该研究有助于更好地了解北京城市化过程中人类活动对公园土壤中BC的影响,为区域乃至全球土壤有机碳库及碳循环研究提供数据补充。
[Abstract]:The mass fraction of soil organic carbon (OC) and black carbon (BC) were measured by sampling and investigating the surface soil of 44 typical parks in Wuhuan, Beijing, and the distribution characteristics of soil BC were studied. The correlation between soil OC and BC and the possible sources of BC were analyzed. The results showed that the OC content of the topsoil in Beijing park was 1.76 ~ (19.61) g / kg ~ (-1) and the average value was 9.08 g ~ (-1) ~ (-1). The variation range was 0.46 ~ (6.25) g ~ (-1) and the average value was 2.16 g ~ (-1). There was a very significant positive correlation between soil OC and BC (r = 0.788N, P0.01), which indicated that BC composition played an important role in soil carbon sequestration and organic matter accumulation. The contribution of BC to the increase of soil organic matter content in Beijing Park could not be ignored. The average value of w (BC) / w (OC) of the park soil in the fifth ring of Beijing is 0.23, which indicates that the main source of BC is the co-combustion of biomass and fossil fuel. In general, the w (BC) / w (OC) value of the park soil near the fourth and fifth rings (0.23 and 0.19) was slightly lower than that of the park soil within the third ring and the second ring (0.26), but the Kruskal-Wallis non-parametric test showed that, except for the third and fifth rings, There was no significant difference in w (BC) / w (OC) value of the park soil near the other ring lines, which indicated that the BC sources of the soils in urban parks showed similar characteristics. This study is helpful to better understand the impact of human activities on BC in park soil during the urbanization process in Beijing, and to provide a data supplement for the study of soil organic carbon pool and carbon cycle in the region and the world.
【作者单位】：北京农业质量标准与检测技术研究中心;清华大学环境学院;唐山工业职业技术学院;环境保护部环境保护对外合作中心;
【基金】：国家自然科学基金项目(212647002) 中国博士后科学基金项目(2016M600099)
【分类号】：S153.6

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