School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2013 Nov 1;465:255-66. doi: 10.1016/j.scitotenv.2012.10.113. Epub 2012 Dec 4.
Concentrations of soil organic carbon (SOC), black carbon (BC), char, and soot in topsoils (0-20 cm) and vertical soil profiles (0-100 cm) from the Chinese Loess Plateau (CLP) were investigated. Objectives of the study were to establish the spatial distributions and estimate the sequestrations of these substances. The SOC, BC, char and soot concentrations were higher in the eastern and southeastern parts of the plateau and lower in the north, which is consistent with the patterns of economic development and energy consumption. The highest average SOC concentration was found in the clayey loess zone, followed by the loess and sandy loess zones. Similar trends were observed for BC, char and soot, suggesting interactions with clay and silt are potentially important influences on OC and BC. The SOC contents in topsoils varied from 0.31 to 51.81 g kg(-1), with a mean value of 6.54 g kg(-1), while BC and char concentrations were 0.02 to 5.5 g kg(-1) and 0.003 to 4.19 g kg(-1), respectively, and soot ranged from 0.01 to 1.32 g kg(-1). Unlike SOC, both BC and char decreased with soil depth, whereas soot showed little variation with depth. BC and char were correlated in the topsoils, and both correlated moderately well with SOC (R(2)=0.60) and soot (R(2)=0.53). The SOC pools sequestered in the 0 to 20 cm and 0 to 100 cm depths were estimated to be 0.741 and 3.63 Pg, respectively, and the BC pools sequestered in the 0 to 20 cm and 0 to 100 cm depths were 0.073 and 0.456 Pg, respectively. Therefore the quantity of carbon stored in the sediments of the CLP evidently exceeds 10(9) tons. The char contained in the upper 20 cm layer was 0.053 Pg, which amounted to 72.5% of the BC in that layer.
研究了中国黄土高原（CLP）表层土壤（0-20cm）和垂直土壤剖面（0-100cm）中土壤有机碳（SOC）、黑碳（BC）、炭和烟尘的浓度，目的是确定这些物质的空间分布并估算其封存量。SOC、BC、炭和烟尘的浓度在高原的东部和东南部较高，在北部较低，这与经济发展和能源消耗模式一致。在粘黄土带发现 SOC 的平均浓度最高，其次是黄土带和沙黄土带。BC、炭和烟尘也呈现出类似的趋势，这表明与粘土和粉砂的相互作用可能对 OC 和 BC 有重要影响。表层土壤中的 SOC 含量范围为 0.31-51.81gkg(-1)，平均值为 6.54gkg(-1)，BC 和炭的浓度分别为 0.02-5.5gkg(-1)和 0.003-4.19gkg(-1)，烟尘的浓度范围为 0.01-1.32gkg(-1)。与 SOC 不同，BC 和炭随土壤深度而减少，而烟尘随深度变化很小。表层土壤中的 BC 和炭相互关联，与 SOC（R(2)=0.60）和烟尘（R(2)=0.53）均有中度相关。在 0-20cm 和 0-100cm 深度范围内，SOC 库的封存量估计分别为 0.741 和 3.63Pg，BC 库的封存量分别为 0.073 和 0.456Pg。因此，CLP 沉积物中储存的碳量显然超过 10(9)吨。上层 20cm 层中的炭含量为 0.053Pg，占该层 BC 的 72.5%。
