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Biogenic VOC Inventories of Subtropical Urban-rural Areas

Author: ZhuZuoMei
Tutor: GeZuo；ChangJie
School: Zhejiang University
Course: Ecology
Keywords: City Forest Species Green Type Isoprene Monoterpenes
CLC: S731.2
Type: Master's thesis
Year: 2011
Downloads: 134
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Abstract


With the acceleration of urbanization, urban population is growing, the world's urban population increased from 10 percent in 1900 to the current more than 50% in the next 50 years, this proportion will continue to increase. China's urban population proportion increases every year since reform and opening to 2020, more than half of the population living in cities. Urbanization and human health and well-being are closely related, the urbanization caused by the various environmental problems have become increasingly subject to public attention. Volatile organic compounds (VOC) in the air pollution has a very important role in the sunlight, and nitrogen oxides (NOx) in the presence of, VOC will contribute to ozone (03) for generating, while the number of cities increases haze days VOC emissions also has important links. At present, a large number of anthropogenic emissions of VOC. (AVOC) research, but for biogenic VOC (BVOC) research is still small. Vegetation is an important source of BVOC emissions, their emissions account for about two-thirds of the total VOC emissions. In this study, we selected two typical southeastern coastal city of Hangzhou and Taizhou as study sites, both through field observations of vegetation composition and vegetation total comprehensive literature local meteorological data and other information, using the literature BVOC emission rate data are weighted The average calculated Hangzhou and Taizhou two cities - rural complex systems BVOC annual emissions. The results showed that: a large Hangzhou (the Greater Hangzhou Area system, GHA) annual emissions of BVOC is 7.9 × 1010 g C, which isoprene, monoterpenes and other VOC (OVOC) the proportion was 85 %, 8% and 7%. Hangzhou BVOC main source of emissions of wild forests. Bamboo Bamboo is the main species in the wild in Hangzhou, with a high plant annual emissions (1.08x 102 g Ctree-1 yr-1, is a major contributor to emissions of isoprene in Hangzhou, the main tree species in several field , the evergreen broad-leaved species beech (Cyclobalanopsis glauca) emissions intensity maximum (1.1X102 g Ctree-1 yr-1, another major species pine, its annual emissions (38gCtree-1yr-1 than an order of magnitude lower bamboo, The fir (Cunninghamia lanceolata) of the four main species of wild lowest emission intensity (2.2 g C tree-1 yr-1. within the city, 70 percent of BVOC emissions from parkland species, 30% of BVOC emissions from trees. Main trees in Hangzhou, willow BVOC highest emission intensity (as 2.7x103gCtree-1 yr-1), sweet gum (1.4 × 103 gCtree-1 yr-1) and Acacia (1.02 × 10gC tree-1 yr-1 ), followed by 2. Taizhou BVOC annual emissions of 6.6 × 1010 g C, which isoprene, monoterpenes and OVOC proportion was 93%, 4% and 3%. Taizhou region BVOC emissions are mainly source for the wild forest, where bamboo forest as the main contributor to urban emissions despite its small but has a direct contribution to the urban environment and urban green space within the two kinds of types in the emission intensity per unit area is higher than the wild mainly three forest types (pine, fir, evergreen broadleaf forest) in the city, 68% of BVOC emissions from trees emissions, 32% from the park and residential area in Taizhou main urban trees, willow BVOC highest emission intensity (as 2.8x103gCtree-1yr-1), Acacia (2.5x103gCtree-1yr-1) followed. Zhaohuai (Sophora japonica) is a common area Taizhou ornamental tree, its BVOC emissions (1.39x103gCtree-1yr -1) below the acacia, while slightly sweet gum (1.35x103gCtree-1yr-1). Magnolia grandiflora and camphor emission intensity ratio above four kinds of trees an order of magnitude lower (respectively 1.5X102 g Ctree-1yr-1 and 1.3X102 g Ctree-1yr-1). Taizhou another two common species of wetland pine and ginkgo emission intensity was 8.1 g C tree-1yr-1 and 4.6 g C tree-1yr-1. 3. in Hangzhou and Taizhou tree species, alien species moved emission rate did not show a particularly high or particularly low value. highest capacity in Hangzhou BVOC emission species, the willow and maple are widely distributed native species, and acacia, two balls sycamore and wetlands are exotic ornamental pine trees. Moreover, in Hangzhou, the main species of evergreen broad-leaved forest of beech BVOC emission potential and camphor, magnolia and other pretty, slightly lower than slash pine, while the other two common Hangzhou native species, pine and fir BVOC emission potential is very small, while in Taizhou, willow, Zhaohuai and Liquidambar BVOC emission capacity is relatively high, and are widely distributed species of native and exotic ornamental species Acacia Potential emissions after willows, came in second place, while the other two common Taizhou alien species, magnolia and wetland pine BVOC emission potential is relatively small, with native species camphor and ginkgo quite. 4 large Hangzhou per unit area BVOC emission potential of 4.7t C km-2yr-1, but lower than the same latitude in the subtropical low 2. N Taizhou region (6.8tCkm-2yr-1. Hangzhou and Taizhou are less than the emission intensity of the subtropical South Rim climate zones Hong Kong (7 .8 t C km-2yr-1). scale in biomes, emission intensity per unit area BVOC emissions appear as Hong Kong gt; Taizhou gt; Hangzhou gt; Beijing. instructions Regardless how vegetation composition, unit Area BVOC emission intensity increased with decreasing latitude.

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