|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Characteristics and Cause Analysis of Heavy Haze in Changchun City in Northeast China显示文摘Northeast China has been reported as having serious air pollution in China with increasing occurrences of severe haze episodes. Changchun City, as the center of Northeast China, has longstanding industry and is an important agricultural base. Additionally, Changchun City has a long winter requiring heating of buildings emitting pollution into the air. These factors contribute to the complexity of haze pollution in this area. In order to analyze the causes of heavy haze, surface air quality has been monitored from 2013 to 2015. By using satellite and meteorological data, atmospheric pollution status, spatio-temporal variations and formation have been analyzed. Results indicated that the air quality in 88.9% of days exceeding air quality index(AQI) level-1 standard(AQI >50) according to the National Ambient Air Quality Standard(NAAQS) of China. Conversely, 33.7% of the days showed a higher level with AQI > 100. Extreme haze events(AQI > 300) occurred frequently during agricultural harvesting period(from October 10 to November 10), intensive winter heating period(from Late-December to February) and period of spring windblown dust(April and May). Most daily concentrations of gaseous pollutants, i.e., NO_2(43.8 μg/m^3), CO(0.9 mg/m^3), SO_2(37.9 μg/m^3), and O_3(74.9 μg/m^3) were evaluated within level-1 concentration limits of NAAQS standards. However, particulate matter(PM_(2.5) and PM10) concentrations(67.3 μg/m^3 and 115.2 μg/m^3, respectively) were significantly higher than their level-1 limits. Severe haze in spring was caused by offsite transported dust and windblown surface soil. Heavy haze periods during fall and winter were mainly formed by intensive emissions of atmospheric pollutants and steady weather conditions(i.e., low wind speed and inversion layer). The overlay emissions of widespread straw burning and coal combustion for heating were the dominant factors contributing to haze in autumn, while intensive coal burning during the coldest time was the primary component of total emissions. In addition, general emissions including automobile exhaust, road and construction dust, residential and industrial activities, have significantly increased in recent years, making heavy haze a more frequent occurrence. Therefore, both improved technological strategies and optimized pollution management on a regional scale are necessary to minimize emissions in specified seasons in Changchun City, as well as comprehensive control measures in Northeast China. | MA Siqi CHEN Weiwei ZHANG Shichun TONG Quansong BAO Qiuyang GAO Zongting | 2017 | Chinese Geographical Science2017，27，6： | 8 |
| 2 | Quantitative Assessment of Impacts of Regional Climate and Human Activities on Saline-alkali Land Changes:A Case Study of Qian'an County,Jilin Province显示文摘Interdecadal and interannual variations of saline-alkali land area in Qian′an County, Jilin Province, China were comprehensively analyzed in this paper by means of satellite remote sensing interpretation, field flux observations and regional climate diagnosis.The results show that on the interannual scale, the impact of climate factors accounts for 71.6% of the total variation of the saline-alkali land area, and that of human activities accounts for 28.4%.Therefore the impact of climate factors is obviously greater than that of human activities.On the interdecadal scale, the impact of climate factors on the increase of the saline-alkali land area accounts for 43.2%, and that of human activities accounts for 56.8%.The impact of human activities on the variation of saline-alkali land area is very clear on the interdecadal scale, and the negative impact of human activities on the environment should not be negligible.Besides, changes in the area of heavy saline-alkali land have some indication for development of saline-alkali land in Qian′an County. | LIAN Yi WANG Jie TU Gang REN Hongling SHEN Baizhu ZHI Keguang LI Shangfeng GAO Zongting | 2010 | Chinese Geographical Science2010，20，1： | 3 |
| 3 | SOIL CONSERVATION EFFICIENCY OF DIFFERENT MODELS CONVERTING FROM STEEP FARMING SLOPE PLOTS IN YA'AN, SICHUAN, CHINA显示文摘Converting farming slope land into artificial forestland or grassland is a major measure of soil/water conservation. Five conversion practices, namely, 1) a control plot still tilled with a crop (maize), 2) a folder grass-growing plot seeded with Lolium perenne, 3) a young alder tree-growing plot, 4) a pear orchard plot and 5)a bamboo plot intercropped with folder grass, were monitored to compare the soil conservation efficiency of those changes in Ya'an, Sichuan for 3 years between September 1998 and August 2001. Results showed that the 5 designed converting models functioned differently in erosion control. The most effective model was bamboo groves intercropped with folder grass (Lolium perenne). The folder grass (Lolium perenne) growing model was more effective than the pure pear orchard model. The least effective model was the young alder tree-growing slope, which was even less effective than the control (a slope without converted cultivation). Meanwhile, changes in the soil's physical properties reflected the same results.Therefore, the optimum model for controlling watershed and slope erosion was by converting farming land into forestland or grassland. | Yulin DENG, Yan PENG, Yukuan WANG and Zongting YANG Institute of Mountain Hazards and Environment, Chinese Academy of Sichuan 610041, P. R. China College of Forestry and Horticulture of Sichuan Agricultural University, Sichuan 625000, P. R. China. Water Resources Administration in Ya’an, Sichuan 625000, P. R. China. | 2003 | International Journal of Sediment Research2003，18，4： | 1 |
| 4 | Northeast China summer temperature and North Atlantic SST显示文摘 | Wu Renguang Yang Song Liu Shi Sun Li Lian Yi Gao Zongting | 2011 | Atmospheres2011，，16： | 1 |
| 5 | Gas phase transformation of mercury in coal2fired power plants显示文摘 | SEN IORC L SAROFIMA F ZONGT | 2000 | Fuel Processing Technology2000，，2： | 1 |
| 6 | The impact of moisture transport of East Asian monsoon on summer precipitation in Northeast China 显示文摘 | Sun Li Shen Baizhu Gao Zongting | 2007 | Advances in Atmospheic Sciences2007，24，4： | 1 |
| 7 | The Excavation and Practical Significance of Folk Art Education Resources of Ethnic Minorities in Guangxi of china显示文摘Guangxi minority folk art education resources is a valuable treasure trove of art, realistic significance to mining and utilization of Guangxi minority folk art education resources. The practice proves that Guangxi minority folk art education resource is a typical folk art 'Encyclopedia', is a folk song 'epic' glorious and resplendent that is a piece of precious folk art 'living fossil'. Guangxi minority folk art education resources mining and utilization, enrich the arts and culture in Guangxi, China the students' national consciousness, and show the rich geographical and cultural characteristics. | Zongting Bi | 2017 | Journal of Educational Theory and Management2017，1，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员