title: [Influencing factors of mercury emission flux from forest soil at Tieshanping, Chongqing].
abstract: To study the effect of environmental influencing factors on soil mercury emissions, intact surface soil samples (0 to 5 cm) were collected from a Masson pine forest in Tieshanping, Choningng to conduct controlled experiments, and soil mercury emission flux was measured by dynamic flux chambers under different conditions. The results showed that the mercury emission significantly increased with the enhancement of solar radiation, air temperature, and soil water content. The mercury emissions in sunlight were 3 to 9 times higher than those in shade, but the latter condition should be more similar to the actual condition in the field. The mercury emission flux was significantly higher in summer than in spring and autumn, and was the lowest in winter. Higher in air temperature, soil water content had a stronger effect on soil mercury emission. Removal of litterfall significantly decreased soil mercury emission, mainly because the mercury content of litterfall was higher than that in mineral soil layer. In addition, soil mercury emission had an obvious trend of decay during a day, indicating that relatively low mercury content in forest soil might be a limiting factor of mercury emission. The mercury emission flux in the daytime measured in this study was( 14.3 +/- 19.6) ng. (m2 .h) -1 in summer, (3.50 +/-5. 36)ng- (m2 h)-1 in spring and autumn, and (1.48 +/-3. 27)ng- (m2 h)-1 in winter. The steady-state results above might therefore be overestimation of the actual emission in the field.
authors: Qiong
authors: Q
authors: Wang
authors: Yao
authors: Y
authors: Luo
authors: Bao-Yu
authors: BY
authors: Du
authors: Zhi-Xiang
authors: ZX
authors: Ye
authors: Lei
authors: L
authors: Duan
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D002681:China; D004784:Environmental Monitoring; D065928:Forests; D008628:Mercury / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013472:Sunlight; D013696:Temperature
chemical_list: D000393:Air Pollutants; D012987:Soil; D012989:Soil Pollutants; D008628:Mercury