Approximately 331 million ha, one-third of China＇s total land, is prone to desertification processes, leading to natural disasters and economic losses. In this study, the situation, tendency, their influences and the...Approximately 331 million ha, one-third of China＇s total land, is prone to desertification processes, leading to natural disasters and economic losses. In this study, the situation, tendency, their influences and their risk governance of desertification and blown sand disaster in China were examined using satellite images, field photographs, field data and a literature review. The desiccated areas in Lop Nor and the lower Heihe River fluvial plain covered about 50,000 km2 and 40,000 km2, respectively. In Ejina, about 100 species of vegetation became extinct. The rate of wind erosion in China was between 1,000 tons/km2/year and 2,000 tons/km2/year. There were 12 sand deserts and sandy lands, occupying a total of 710,000 km2. Salinized soils occurred across 99.1 million ha. The two main sand and dust storm-prone areas in China were the Tarim Basin and its surroundings, and the Alxa Plateau and its surroundings. From 1981 to 2007, the annual average frequency of sand and dust storms varied from 1 d to 37 d with a general increase from southeast to northwest. Since 1978, China has implemented a number of ecological construction projects that have reduced desertification from 1999 to 2004 and from 2005 to 2009, and the number of dust and sand storm days from 9.3 d between 1954 and 1959 to 4.4 d between 2000 and 2007. The results could improve understanding of desertification and blown sand disasters in China and provide valuable experiences for global desertification control.展开更多
Nowadays human society enters the 21st century, with the rapid economic and technological development, people＇s material and spiritual requirements has got great satisfaction. However, natural environmental damage br...Nowadays human society enters the 21st century, with the rapid economic and technological development, people＇s material and spiritual requirements has got great satisfaction. However, natural environmental damage brought by us is also accelerating. Natural disasters happen frequently, including ecological degradation and deterioration, energy resources crisis, greenhouse effect, earthquakes, tsunamis, volcanoes etc. The global crisis has once again waken-up call to mankind. How to properly solve these crises had become a common and urgent responsibility of mankind. This paper will mainly discuss and seek some new potential methods in solving energy crisis and environmental problems from the perspective of automotive and architecture design. As an architect, how to avoid light pollution and reduce heat absorption of roof, increasing heat reflectance of roof are becoming their main and urgent responsibilities. On the other hand, reducing greenhouse effect, researching and developing new low-carbon, low-emission fuel sources are also becoming automotive designers＇ obligations. Living in harmony with nature ＆ earth is becoming the common human themes of the 21 st century.展开更多
文摘Approximately 331 million ha, one-third of China＇s total land, is prone to desertification processes, leading to natural disasters and economic losses. In this study, the situation, tendency, their influences and their risk governance of desertification and blown sand disaster in China were examined using satellite images, field photographs, field data and a literature review. The desiccated areas in Lop Nor and the lower Heihe River fluvial plain covered about 50,000 km2 and 40,000 km2, respectively. In Ejina, about 100 species of vegetation became extinct. The rate of wind erosion in China was between 1,000 tons/km2/year and 2,000 tons/km2/year. There were 12 sand deserts and sandy lands, occupying a total of 710,000 km2. Salinized soils occurred across 99.1 million ha. The two main sand and dust storm-prone areas in China were the Tarim Basin and its surroundings, and the Alxa Plateau and its surroundings. From 1981 to 2007, the annual average frequency of sand and dust storms varied from 1 d to 37 d with a general increase from southeast to northwest. Since 1978, China has implemented a number of ecological construction projects that have reduced desertification from 1999 to 2004 and from 2005 to 2009, and the number of dust and sand storm days from 9.3 d between 1954 and 1959 to 4.4 d between 2000 and 2007. The results could improve understanding of desertification and blown sand disasters in China and provide valuable experiences for global desertification control.
文摘Nowadays human society enters the 21st century, with the rapid economic and technological development, people＇s material and spiritual requirements has got great satisfaction. However, natural environmental damage brought by us is also accelerating. Natural disasters happen frequently, including ecological degradation and deterioration, energy resources crisis, greenhouse effect, earthquakes, tsunamis, volcanoes etc. The global crisis has once again waken-up call to mankind. How to properly solve these crises had become a common and urgent responsibility of mankind. This paper will mainly discuss and seek some new potential methods in solving energy crisis and environmental problems from the perspective of automotive and architecture design. As an architect, how to avoid light pollution and reduce heat absorption of roof, increasing heat reflectance of roof are becoming their main and urgent responsibilities. On the other hand, reducing greenhouse effect, researching and developing new low-carbon, low-emission fuel sources are also becoming automotive designers＇ obligations. Living in harmony with nature ＆ earth is becoming the common human themes of the 21 st century.
