The research on ecological engineering has been lasting for more than four decades. As a new, cheaper, environmentally acceptable and alternative techniques, ecological engineering has been applied to many aspects, i...The research on ecological engineering has been lasting for more than four decades. As a new, cheaper, environmentally acceptable and alternative techniques, ecological engineering has been applied to many aspects, including ecoagricultural engineering, ecosystem restoration, environmental conservation, and pollution control. This paper presents a conceptual understanding on the issues of ecological engineering, including its origin, concepts, goals, principles and applications.展开更多
Ecosystem health is a newly proposed concept that sets new goals for environmental management. Its definition, assessment indicators, and assessment methods are reviewed in this paper. Literature shows that the defini...Ecosystem health is a newly proposed concept that sets new goals for environmental management. Its definition, assessment indicators, and assessment methods are reviewed in this paper. Literature shows that the definitions and the assessment indicators cover a wide range of ecosystem health, and they differ in terms of researchers different scientific background. It is concluded that the concept of ecosystem health cannot be defined or understood simply in biological or ethical or aesthetic or historical terms and the assessment should be based on applying several indicators simultaneously to get overall picture of the health or integrity state of an ecosystem.展开更多
The criteria for the construction of an eco agricultural county in China were suggested. The criteria should coordinate social, economic, and environmental effects together. At first, it emphasizes on the social e...The criteria for the construction of an eco agricultural county in China were suggested. The criteria should coordinate social, economic, and environmental effects together. At first, it emphasizes on the social effect input into the system, which includes population control, cultural, scientific, and moral education, technical training and so on. Secondly, economic criteria are mainly those of the increase of gross national product(GNP) and income per capita every year. Finally, the technical criteria consist of not only the grain yield, commodity percentage of the agricultural product, cultivated output/input, animal husbandry production value/total agricultural production value and other agricultural criteria, but also environmental criteria, such as the percentage of forest and grass cover, degenerated land under control, recycling of organic waste, recommended fertilization, integrated pest management, treatment of discharged wastes and others. In an eco agricultural system, the realization of these criteria by three different development steps were recommended too.展开更多
Using the method of life cycle assessment (LCA), the paper studies systematically on municipal solid waste incineration and ecological engineering treatment in Guanghan City. The results showed that the environmental...Using the method of life cycle assessment (LCA), the paper studies systematically on municipal solid waste incineration and ecological engineering treatment in Guanghan City. The results showed that the environmental impact potentials of incineration and ecological engineering treatment is 4\^89×10 -2 and 1\^23×10 -2 respectively ; the net energy consumption is -3\^44×10 2 MJ/ton and -2\^90×10 1 MJ/ton, respectively; the net treatment cost is 84.76 RMB Yuan/ton and 32\^52 RMB Yuan/ton, respectively. Comparing with sole incineration, ecological engineering integrates the advantages of incineration and composing, which not only can reduce the amount of waste for incineration and decrease the second environmental pollution, but also can produce high quality compound fertilizer by adding certain amount of chemical fertilizer into compost. It is proved that ecological engineering treatment is an environmental sustainable and economic afforadably method.展开更多
文摘The research on ecological engineering has been lasting for more than four decades. As a new, cheaper, environmentally acceptable and alternative techniques, ecological engineering has been applied to many aspects, including ecoagricultural engineering, ecosystem restoration, environmental conservation, and pollution control. This paper presents a conceptual understanding on the issues of ecological engineering, including its origin, concepts, goals, principles and applications.
文摘Ecosystem health is a newly proposed concept that sets new goals for environmental management. Its definition, assessment indicators, and assessment methods are reviewed in this paper. Literature shows that the definitions and the assessment indicators cover a wide range of ecosystem health, and they differ in terms of researchers different scientific background. It is concluded that the concept of ecosystem health cannot be defined or understood simply in biological or ethical or aesthetic or historical terms and the assessment should be based on applying several indicators simultaneously to get overall picture of the health or integrity state of an ecosystem.
文摘The criteria for the construction of an eco agricultural county in China were suggested. The criteria should coordinate social, economic, and environmental effects together. At first, it emphasizes on the social effect input into the system, which includes population control, cultural, scientific, and moral education, technical training and so on. Secondly, economic criteria are mainly those of the increase of gross national product(GNP) and income per capita every year. Finally, the technical criteria consist of not only the grain yield, commodity percentage of the agricultural product, cultivated output/input, animal husbandry production value/total agricultural production value and other agricultural criteria, but also environmental criteria, such as the percentage of forest and grass cover, degenerated land under control, recycling of organic waste, recommended fertilization, integrated pest management, treatment of discharged wastes and others. In an eco agricultural system, the realization of these criteria by three different development steps were recommended too.
文摘Using the method of life cycle assessment (LCA), the paper studies systematically on municipal solid waste incineration and ecological engineering treatment in Guanghan City. The results showed that the environmental impact potentials of incineration and ecological engineering treatment is 4\^89×10 -2 and 1\^23×10 -2 respectively ; the net energy consumption is -3\^44×10 2 MJ/ton and -2\^90×10 1 MJ/ton, respectively; the net treatment cost is 84.76 RMB Yuan/ton and 32\^52 RMB Yuan/ton, respectively. Comparing with sole incineration, ecological engineering integrates the advantages of incineration and composing, which not only can reduce the amount of waste for incineration and decrease the second environmental pollution, but also can produce high quality compound fertilizer by adding certain amount of chemical fertilizer into compost. It is proved that ecological engineering treatment is an environmental sustainable and economic afforadably method.
