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To investigate changes in the emission characteristics of key pollutants following the transition from household coal-burning to biomass clean heating in the Fenwei Plain, field measurements were conducted in rural areas of Xianyang using a variety of residential biomass-burning devices. Results showed that, in automatically fed pellet stoves, particulate emissions were dominated by PM2.5, with emission factors for PM2.5 and PM10 of 1.14g/kg and 1.28g/kg, respectively, significantly lower than those of traditional stoves. Water-soluble ions in PM2.5 were dominated by K+ and Cl-, accounting for 81.5 %~94.3 % of total ionic mass, which was 25.9 %~69.6 % higher than that in traditional stoves. Due to the use of cleaner fuels and more efficient combustion, the total carbon (TC) emission factor in PM2.5 from pellet stoves ranged from 0.1 to 0.4g/kg, in contrast to 0.6~3.6g/kg for traditional stoves. Levoglucosan (LG) in PM2.5 from pellet stoves showed the lowest emission factor, with a lower LG/OC ratio than that of traditional stoves, indicating a reduced contribution of advanced stoves to organic carbon aerosol emissions. By integrating the experimentally derived LG emission factors into an established empirical model, we estimated that the clean-heating transition had reduced the contribution of residential biomass burning to organic carbon aerosol by approximately 6.4 %.
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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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