Characteristics of environmental factors and their effects on CH4 and CO2 emissions from a closed landfill: an ecological case study of Shanghai.
To elucidate the influence of landfill gas (LFG) emission on environmental factors, an ecological investigation that was primarily concerned with the characteristics of vegetation, cover soil, and solid waste in the landfill was carried out. Temporal and spatial variations in vegetation diversity and coverage and their effects on reducing the emission of methane in the landfill were investigated. The results showed that both vegetation coverage and diversity increased with elapsed landfill closure time. The transition trend of the vegetation species was from perennial plant (Phragmites australis) to annual plants. Perennial vegetation was the dominant type of vegetation during the early closure period, and annual vegetation coverage increased with closure time. Vegetation preferentially appeared in areas of comparatively high depth of cover soil, which was characterized by high moisture retentiveness that enabled vegetation growth. The concentrations of methane and carbon dioxide in the cover soil significantly decreased with increasing closure time. The concentrations of methane and carbon dioxide from bare cover soil were higher than those from vegetated cover soil whereas the CO(2) flux of bare cover soil was less than that of vegetated cover soil.
Xiaoli
Chai
C
The State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. xlchai@tongji.edu.cn
Ziyang
Lou
L
Shimaoka
Takayuki
T
Nakayama
Hirofumi
H
Ying
Zhu
Z
Xiaoyan
Cao
C
Komiya
Teppei
T
Ishizaki
Toshio
T
Youcai
Zhao
Z
D001673:Biodegradation, Environmental; D002245:Carbon Dioxide / Q000737:chemistry*; D002681:China; D002947:Cities; D004463:Ecology; D004784:Environmental Monitoring; D004867:Equipment Design; D005740:Gases; D008697:Methane / Q000737:chemistry*; D010944:Plants / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil; D013997:Time Factors; D018505:Waste Management / Q000379:methods*
D005740:Gases; D012987:Soil; D002245:Carbon Dioxide; D008697:Methane