Forests can play an important role in mitigating the impacts of climate change by reducing atmospheric carbon dioxide.The purpose of this study is to quantified carbon storage and sequestration by forests and carbon emissions from energy consumption by several energy types in Tianjin,China,as well as the role of forests on offsetting carbon emissions from fossil fuel combustion.Data used for this study were collected according to the sixth national forest inventory(1999-2003) and China energy statistical yearbook.The results showed that the forests including natural forests and plantation forests in Tianjin stored 571,151.24 t C,with a carbon sequestration rate of 27,311.79 t C/yr. carbon storage per ha was 14.65 t C, and carbon sequestration per ha was 0.87 t C/yr. Carbon emissions from energy consumption in Tianjin were 3.85×107 t C /yr. The carbon stored by forests equaled to 1.48% of the annual carbon emissions from fossil fuel combustion, and carbon sequestration could offset 0.07% of the annual carbon emissions in Tianjin. In addition, the results indicates that the carbon storage and sequestration rate varied among forest types with different species and age structure. They provide insights for decision-makers and the public to better understand the role of forests, and make better management plans for forests.
Dust pollution has become one of the major problems that impact unban environment. While urban vegetation plays an important role in improving the urban atmospheric environment. This study conducted a preliminary research on the dust-retention ability of 20 greening tree species, by field sampling investigating and laboratory analyzing. The 20 greening tree species in Tianjin Airport Economic Area, a new industrial zone of Tianjin, were taken as research object. The results of the study show that: (1) the dust-retention ability of shrubs is bigger than arbors; (2) the dust-retention ability per unit area of different tree species varies; (3) Among Arbors, the order of the dust-retention ability is Populus tomentosa> Sophora japonica> Paulownia tomentosa> Firmiana simplex> Platanus orientalis> Robinia pseudoacacia> Koelreuteria paniculata> Salix matsudana > Fraxinus chinensis; (4) Among shrubs, the order is Syzygium aromaticum> Kerria japonica> Sorbaria sorbifolia> Ligustrum obtusifolium> Malus micromalus> Prunus cistena> Hibiscus syriacus> Prunus cerasifera var. pissardi> Prunus cistena> Lonicera maackii (Rupr.)Maxim.> Sambucus racemosa> Cercis chinensis. The research provides a theoretical basis for choosing the tree species in reducing the atmospheric particulate matter in Tianjin Airport Economic Area and the new industrial zone of northern China. In addition, the greening activity will be in favor of improving the ecological environment of the region.
The disposal of the drill cuttings is a complex environmental problem. In the paper, two offshore drill cuttings management options are evaluated using life cycle inventory analysis, namely offshore reinjection and onshore solidification. Environmental burdens of the two management options are calculated. Results indicated that: a) From the life cycle perspective, treating 1 m3 drill cuttings, onshore solidification generate more CO2, CO, NOx, COD, TOC and Ammonia nitrogen than reinjection. On the contrary, reinjection generate more PM 2.5, PM10, SOx, Nitrate, and SS than solidification. Which option has less environmental impact needs further assessment. b) Selecting an environment-friendly curing agent is necessary for solidification process to reduce CO2 emissions.
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