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Outline
The concentration and carbon isotope compositions (δ13C-CH4, δ13C-CO2) of methane (CH4) and carbon dioxide (CO2) along the coastal of eastern China were studied using vehicle mounted mobile measurement methods. The results indicated that the CH4 concentration was observed to range from (1.84~2.94) ×10-6, with an average concentration of 2.09×10-6. The highest value was recorded in Jiangmen, Guangdong (2.32×10-6), while the lowest value was recorded in Zhangzhou, Fujian (1.94×10-6). The CO2 concentration was found to range from (420.51~857.33) ×10-6, with an average concentration of 525.70×10-6. The highest value was measured in Shenzhen, Guangdong (599.08×10-6), and the lowest value was measured in Nantong, Jiangsu (477.42×10-6). Both CH4 and CO2 levels in the study area were found to exceed the atmospheric background values. The δ13C-CH4 values ranged from-62.62‰ to -29.70‰, with an average of -43.65‰. The highest value was observed in Qingdao, Shandong (-40.24‰), and the lowest value was observed in Zhangzhou, Fujian (-48.25‰). The δ13C-CO2 values ranged from -28.64‰ to -9.19‰, with an average of -17.53‰. The highest value was recorded in Nantong, Jiangsu (-14.45‰), and the lowest value was recorded in Shenzhen, Guangdong (-19.13‰). In the study area, CH4 concentration was found to be positively correlated with its carbon isotope signature, while CO2 concentration was negatively correlated with its carbon isotope signature. Per capita GDP, the number of civilian vehicles, livestock inventory, and rice cultivation area were all positively correlated with CH4 concentration and its carbon isotope signature. In contrast, the forest coverage rate was negatively correlated with CH4 concentration and its carbon isotope signature. δ13C (CO2) was utilized to trace the sources and sinks of atmospheric CO2 along the coastal regions of Shandong, Jiangsu, Shanghai, Zhejiang, Fujian, and Guangdong. Their respective δ13C (CO2) source signatures (δ13Cs) were determined to be: -37.90‰, -37.67‰, -41.24‰, -34.12‰, -33.99‰, and -32.39‰. These values indicated that the combustion of petroleum and natural gas was identified as the primary contributing source to CO2 emissions in the study area.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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