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An analysis of recycling performance for achieving a zero-emission society

100%
Chen Y.-T.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 6
Considering the management objectives of sustainable development, this paper examines and compares the recycling performance of various waste fractions in Taiwan in the context of sustainable development and develops a simple calculation method to define recycling performance for each waste fraction. In this paper, recycling performance is defined as the ratio of waste recycled to waste generated. The result finds that the recycling performance of waste metals was the highest, followed by waste glass and waste paper. This paper also finds that the recycling performance of food waste increased with the mass of food waste until it reached an optimum and dropped off with additional increases in mass of food waste past in the optimum. In consideration of a large amount of food wastes generated from productive institutions such as wholesalers, retailers, and restaurants, etc., this paper suggests 2 instruments to reduce the generation rate of food waste and increase recycling performance at the source: 1) a tax on food waste generated in the production process and 2) requiring production facilities to install affiliated digestion or composting plants for recycling of food waste. As for reducing consumptive food waste, this paper emphasizes the important role of environmental education for the public to engage in green consumption.
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Aboveground biomass and vertical distribution of crown for Taiwan red cypress 20 years after thinning

51%
Yen T.-M., Lee J.-S., Li C.-L., Chen Y.-T.
Dendrobiology
|
2013
|
tom 70
The aim of this study was to analyze the influence of thinning on the different growth stages of the Taiwan red cypress (Chamaecyparis formosensis Matsum) on the aboveground biomass allocation patterns and vertical distribution of foliage and branch biomass at the tree level. Although numerous studies in various fields have focused on the influence of thinning effects for Taiwan red cypress, few have assessed the aboveground biomass allocation of different growth stages, or conducted a long-term thinning observation. In this study, we examined 3 even-aged plantations in central Taiwan. In 1982, 3 stands, at ages 7, 15, 21 years, simultaneously began thinning trials. A thinning study was conducted once 20 years ago, and we assessed the long-term effects. The effects of thinning in each of the stands were analyzed and compared at the tree level 20 years later. Each component of the aboveground biomass (foliage, branches, and boles) increased with the thinning intensity, regardless of the age category of the trees; however, the crown mass/ aboveground tree mass appeared the same for each tree age category, regardless of the thinning intensity. We inferred that this phenomenon might result from the same proportional increase of crown mass and aboveground tree mass as the thinning intensity was increased. An allometric function was used to quantify the vertical distribution of the foliage and branch biomass; the results showed an increase in the accumulation of the branch biomass at lower heights following thinning, and the same trend was apparent in all 3 plantations.
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