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Agroforestry, Rural Populations, poplar plantations and Marketing

Journal of Environmental Science and Engineering 2011年第1期5卷 71-77页

作者： A.S. Christodoulou Laboratory of Forest Economics Faculty of Forestry and Natural Environment Thessaloniki 54124 Greece

One of the objectives of the 1257/99 EU regulation was that rural populations should be able to gain an extra income. This regulation may not be any longer in force, but soon a new one will replace it. The plantations that are created by Greek farmers more specifically the plantations of poplar trees-have a ten-year rotation at least. This means that the time between the establishment of the plantation and the harvest is high. As a consequence, during this time, the market environment （e.g. prices） may face substantial changes. Frequently, these changes are so immense that producers are driven in economic distress. This situation is also linked to the domestic timber supply and imports, and as a result to the product prices. Concerning the market prices of poplar trees, one additional factor that has probably deteriorated the situation is the E.U. expansion. This paper examines a case study in North Greece. Vital conclusions are made which may be useful for the Greek and E.U. decision makers regarding the process of dealing with current issues such as the 1257/99 regulation replacement （1698/2005）.

关键词： Environment afforestation poplar plantations timber marketing

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Effects of poplar plantations on the Physical and Chemical Properties of Soils:A Case Study in the North China Plain

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Journal of Resources and Ecology 2016年第5期7卷 352-359页

作者：王佳月辛良杰中国科学院地理科学与资源研究所中国科学院陆地表层格局与模拟重点实验室北京100101 中国科学院大学北京100049

In recent years, large areas of farmland in the North China Plain have been converted into short-rotation poplar plantations. To analyze the impacts of poplar plantations on soil, 22 soil samples were collected and assayed from the soil profiles of a corn field and a poplar plantation. The results showed that the average soil moisture content of the soil profile in the poplar field was 2.6 percent lower than that of the arable land. The maximum dif- ference in soil moisture content was found in the upper 0-10 cm of topsoil. Soil organic matter and nitrogen, phosphorus and potassium in the cornfield were significantly higher than in the poplar field. Higher nutrient content in the corn field may result from higher fertilizer inputs and the practice of returning straw to the cropped field. The analysis also showed no significant increase in soil organic matter content in deeper soil layers of the poplar field, which means that the conditions are not favorable for the formation of soil organic matter, or that soil organic matter needs a longer time to develop. Elements such as magnesium, iron, manganese and copper in both the corn field and the poplar field had a tendency to accumulate with increasing soil depth. Magnesium, iron, manganese and copper in the 0-80 cm soil layer of the poplar field were higher than those of the cornfield, but the situation was reversed at depths greater than 80 cm. It is concluded that poplar trees consume a large amount of soil moisture and soil nutrients. Local governments should prevent the development of new plantations of fast-growing trees in farmland and help farmers to recover their farmland from forestry plantations.

关键词： poplar plantations North China Plain soil physical properties soil chemical properties

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A Methodology for Collection of Residential Construction Residue in Manaus

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Journal of Environmental Science and Engineering(A) 2012年第9期1卷 1149-1162页

作者： Luciane Farias Ribas Guiherme Chagas Cordeiro Adalena Kennedy Vieira Raimundo Kennedy Vieira Graduate School of Research and Engineering Federal University of Rio de Janeiro Rio de Janeiro 21945-970 Brazil Science and Technology Center State University of Norte Fluminense Darcy Ribeiro Campos dos Goytacazes 28013-600 Brazil Superior School of Technology Amazonas State University Manaus 690055-010 Brazil Techonology Faculty Federal University of Amazonas Manaus 69077-000 Brazil

Civil construction is one of the largest consumers of raw materials and producers of waste, which has been causing environmental problems both through the extraction of raw materials and through building activity by generation of waste. Notwithstanding the need to find an optimum use for solid construction residue to try to solve or minimize this problem, there are no standards for the process of obtaining the CDR （construction and demolition residue）. Thus, the aim of this study was to develop a method of collecting solid waste at the construction site that is easy and low-cost and thus can be applied throughout the construction industry. This collection method was designed to produce residue with the desired proprieties and obtain the best possible homogeneity. This method permitted to evaluate the factors generating construction residue more precisely.

关键词： Residue civil construction poplar plantations timber marketing.

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A Novel Method for the Fabrication of Granular Hydroxyapatite-bentonite Composite Adsorbents for the Removal of Pb2＋ from an Aqueous Solution

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Journal of Environmental Science and Engineering(B) 2016年第7期5卷 371-378页

作者： ThiMinh Hieu Do Pham ThanhThao Tran AnhKhoaTon Minh Vien Le Department of Inorganic Chemical Engineering Ho Chi Minh City University of Technology Ho Chi Minh City 70000 Vietnam

Granular HApB composite adsorbents, with dimensions of 4 mm × 4 mm, were prepared for the removal of lead from an aqueous solution. The effectiveness of the composites for Pb2＋ removal from an aqueous solution with different initial concentrations, adsorbent doses and reaction times were examined. The Langmuir isotherms, Freundlich isotherm models and pseudo-second order kinetic model were used in this analysis. It was found that the Langmuir model fitted the experimental data better than the Freundlich model, with a maximum adsorption capacity of 93.37 mg.g-1. The pseudo-second order kinetic model also fit the experiment data well with an adsorption capacity of 70.73 mg.g-1 after being reused for 3 times. Furthermore, the composites may possibly be used in processes for industrial water treatment.

关键词： Environment afforestation poplar plantations timber marketing.

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