检索结果-南通市图书馆

Modeling and prediction for the acute toxicity of pesticide mixtures to the freshwater luminescent bacterium Vibrio qinghaiensis sp.-Q67

引用

Journal of environmental Sciences 2010年第3期22卷 433-440页

作者： Xuefei Zhou, Wenjing Sang, Shushen Liu, Yalei Zhang, Huilin GeState Key Laboratory of Pollution Control and resources Reuse, Key Laboratory of Yangtze River Water environment, Ministry of Education, College of environmental Science and Engineering, Tongji university, Shanghai 200092, {4.. [a] State Key Laboratory of Pollution Control resources Reuse Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science Engineering Tongji University Shanghai 200092 China

In china, water pollution by pesticide mixtures has constituted a serious environmental problem due to potential toxicity and bioaccumulation. But few pesticide combinations have exactly similar and dissimilar mechanisms of action. For this purpose, in tests with the freshwater luminescent bacterium （Vibrio qinghaiensis sp.-Q67）, ten pesticides, including three herbicides and seven insecticides, were selected as test substances. Concentration response analysis was performed for ten individual substances, and for mixtures containing all ten substances in twelve different concentration ratios （based on UDCR and EECR methods）. The observed mixture toxicity was compared with predictions by the two models, concentration addition （CA） and independent action （IA）. The toxicity of the tested mixtures showed a good agreement with those predicted by the concept of CA except four UDCR mixtures： UD10-2, UD10-4. UD10-8 and UD10-10. To examine the influence of imidacloprid in the four UDCR mixtures （UD10-2, UD10-4. UD10-8, UD10-10）, it was removed from the ten-pesticide mixtures and the remaining nine chemicals were combined at the same relative proportions based on the UDCR method （UD9-2, UD9-4. UD9-8, UD9-10）. There was not significant departure from CA for the scattered points with the nine remaining pesticides omitting imidacloprid. Thus, imidacloprid may significantly influence the other pesticides due to its properties.

关键词： pesticides Vibrio qinghaiensis sp.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CHALLENGES AND PROBLEMS: china'S URBAN GOVERNANCE

引用

Chinese Geographical Science 2002年第2期12卷 152-156页

作者： WANG Hong, GU Chao lin(Department of Urban and resources Sciences, Nanjing university, Nanjing 210093, P.R.china) Department of Urban and resources Sciences Nanjing University Nanjing 210093 P. R. China

china′s urban reforms have brought social progress and development, but a comprehensive national system of social welfare (for example, unemployment insurance, pensions, medical care and public housing) for new migrants from rural areas is lacking. One of the most remarkable changes in Chinese cities in the last decade was a change in social "equality", with the rise of new poverty both in individual communities and some social groups in urban society. However, there is little social assistance and public infrastructure for the migrants. Governments or communities or individual should pay attention to the control of new urban poverty and new slums. This paper consider that it is necessary to launch a successful policy, which include mainly: 1) accommodating urban growth through low cost investment projects; 2) urban economy depends heavily on successful macroeconomic policy; 3) to broaden the three channels linking adjustment to the incidence of urban poverty; 4. to restructure urban economic based on the high or new technology; 5) to coordinate relationship between urban economic growth and environment management for sustainable development of Beijing′s metropolitan fringe.

关键词： urban challenges and problems urban governance urban policies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Principal Chemical Properties of Artificial Soil Composed of Fly Ash and Furfural Residue

引用

Pedosphere 2006年第5期16卷 668-672页

作者： FENG Yong-Jun LI Fen WANG Xiao-Ling LIU Xi-Min ZHANG Lei-Na College of resources and environment Shandong Agricultural University Tai＇an 271018 （China） Institute of Geographical Sciences and Nature resources Research Beijing 100101 （China）

To solve soil shortage in reclaiming subsided land of coal mines, the principal chemical properties of artificial soil formed by mixing organic furfural residue and inorganic fly ash were examined. The results indicated that the artificial soil was suitable for agriculture use after irrigation and desalination, the available nutrients in the artificial soil could satisfy the growth demand of plants, and the pH tended to the neutrality.

关键词： artificial soil chemical properties fly ash furfural residue

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Residents’ Willingness to Pay for Improving Air Quality in Jinan, china

引用

Chinese Journal of Population,resources and environment 2007年第2期5卷 12-19页

作者： Wang Yan, Zhang Yisheng, Wang Qian, Wang Wei School of environmental Science and Engineering, shandong university, Jinan shandong 250100, {4. School of environmental Science and Engineering Shandong University Jinan Shandong 250100 China

Along with the progress of urbanization and environ- mental deterioration, residents’ desire for improved air quality is increasing. In order to quantify an individual’s willingness-to-pay (WTP) for improved air quality in Jinan of eastern china, a contingent valuation method (CVM) was employed. A sample of 1,500 residents was chosen on the basis of multistage sampling methods with face-to-face interviews by using a series of hypo-thetical, open-ended scenario questions which were designed to elicit the respondents’ WTP. Results showed that 59.7% of respondents were able to express their WTP and the mean WTP is 100 Chinese Yuan (CNY) per person per year. A probit model on the probability of a positive WTP and a regression model were developed to find the relationship between endogenous variables and WTP. Most parameters in the econometric analysis had the expected sign. Annual household income and expenditure on treating respiratory diseases significantly influence WTP. The rates of positive WTP and the monetary amount are larger for men than for women. Results also showed that people who lived in more polluted areas were willing to pay more for clean air. Unlike developed countries, clean air may only be considered as a public good in china in that more than 4.% of respondents had no incen- tive to bear the costs of attempting to achieve better air quality, which indicates the relatively low environmental consciousness.

关键词： air quality willingness to pay contingent valuation method Jinan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thresholds of geographic environmental elements in sediment yield of drainage basins

引用

Science china Earth Sciences 2005年第2期48卷 230-240页

作者： CHEN Hao, ZHOU Jinxing, CAI Qiangguo, LU Zhongchen & LI Zhongyan Institute of Geographic Sciences and Natural resources Research, Chinese Academy of Sciences, Beijing 100101, china Institute of Forestry Science, Chinese Academy of Forestry Science, Beijing 100091, china Research Center for Eco-environment Sciences, Chinese Academy of Sciences, Beijing 100085, china Computing Institute of Science and Engineering, North china Electric Power university, Beijing 102206, china 1. Institute of Geographic Sciences and Natural resources Research Chinese Academy of Sciences 100101 Beijing China 2. Institute of Forestry Science Chinese Academy of Forestry Science 100091 Beijing China 3. Research Center for Eco-environment Sciences Chinese Academy of Sciences 100085 Beijing China 4. Computing Institute of Science and Engineering North China Electric Power University 102206 Beijing China

Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis.

关键词： middle Yellow River, environmental element, sediment, sediment delivery mudule, threshold.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on Catastrophic Mechanism of Water-inrush From Coal Floor

Study on Catastrophic Mechanism of Water-inrush From Coal Fl...

引用

2004.全科学与技术国际会议

作者： WANG Lianguo1 MIAO Xiexing1 & SONG Yang2 (1 College of Scicences china university of Mining and technology Xuzhou 221008 Jiangsu china) (2 College of {4. and environment Eng shandong university of Science and technology Taian 271019 shandong china)

In the paper, a cusp catastrophic model of water-inrush from coal floor is established, and water-inrush mechanism of coal floor destruction is analyzed. The ratio, IP, of water pressure to stress can

关键词： water-inrush from coal floor catastrophe mechanism

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research on Formational and Evolutional Processes of Xingwen's Erosive Karst Tiankeng

引用

四川地质学报 2009年第S1期 153-159页

作者： SHUI Wei 1,WANG Xing-gui 2,ZHANG Bin 3,SHU Cheng-qiang 3,WEI Ya-li 4.LI Tie-song 3,ZHANG Qi-chun 3,CHENG Jin-ping 4.1.Department of Eco-agriculture and Rural Development,Sichuan Agricultural university,Ya'an 625014.Sichuan 2.environment and Life Science of Kangding Nationality Teachers College,Kingding 626001,Sichuan 3.School of Land and resources,china West Normal university,Nanchong 637002,Sichuan 4.College of resources and environment,Sichuan Agricultural university,Ya'an 625014.Sichuan)

According to the first-hand investigation and study on Xingwen Global Geopark,the results and the data show that apart from Dayanwan and Xiaoyanwan collapsed karst Tiankeng,there are other karst landforms in Bowang Mount scenic spot such as Feiwu Cave,Dao Cave,Cangshuiyan Gorge,Nanxing TanKeng and so *** typical karst landforms could be regarded as different vestiges of erosive karst Tiankeng of Xingwen Global Geopark,which stand for the evolutional processes of erosive karst Tiankeng ***,the evolutional processes of erosive karst Tiankeng could be divided into the following continuous processes:an erosive karst Tiankeng develops from the processes of eroding and dissolving & extending of silo Sinkhole,and subsequently degrades to a large gorge or *** is worth pointing out that except for erosion of flowing water,at the same time,collapse effect has been playing extremely important role in the forming processes of these special erosive landforms.

关键词： Erosion Evolution Tiankeng Xingwen Global Geopark

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Study on curved surface fitting model using GPS and leveling in local area

引用

中国有色金属学会会刊：英文版 2005年第S1期15卷 148-152页

作者： GUO Jin-yun~1, CHANG Xiao-tao~2, YUE Qiang~3 (1. Department of Territory Information and Surveying Engineering, Xuzhou Normal university, Xuzhou 221009, china 2. Chinese Academy of Surveying and Mapping, Beijing 100039, china 3. shandong university of Science and technology, Qingdao 266510, china) Xuzhou Normal Univ Dept Terr Informat & Surveying Engn Xuzhou 221009 Peoples R China Chinese Acad Surveying & Mapping Beijing 100039 Peoples R China shandong Univ Sci & Technol Qingdao 266510 Peoples R China

The height anomaly surface is fitt and the quasi-geoid can be obtained when the height anomaly is determined with the geometric analytic method. Therefore, some mathematical models to fit height anomaly surface using GPS, leveling and terrain data in a local area, including the polynomial fitting model, the multi-surface function fitting model, the motion surface fitting model and the fitting model of little flexibility deformation of thin board, are given. Then the digital characteristics are analyzed with the curved surface theory. The General curvature and the mean curvature of surface are concluded. The advantage, disadvantage and application of the above models are discussed. The effect of terrain undulation on height anomaly is considered in the surface fitting models. The practical case indicates that these models are of validity and practicability. It is concluded that the above models can give the good fitting results at the centimeter level. But the polynomial fitting model is worse than the other models.

关键词： GPS height anomaly terrain effect curve surface fitting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Salt Contents in Soils Under Plastic Greenhouse Gardening in china

引用

Pedosphere 2001年第4期11卷 359-367页

作者： LIWENQING S．VANDERZEE 等 Collegeofresourcesandenvironment ShandongAgriculturalUniversityTainan271018（China） Sub－DepartmentofSoilScienceandPlantNutrition WageningenAgriculturalUniversityP.O.Box80056700EC

Field experiments were conducted on three main soils, brown soil, meadow soil and cinnamon soil, of shandong Province to study the effect of plastic greenhouse gardening on soil salt contents. As compared to the open fields, the soil nutrient contents in the fields under plastic greenhouse gardening all increased significantly. The organic matter, quickly available N and P increases were extremely significant and the quickly available K increase was also significant. Along with the nutrient increases the soil salt contents increased clearly in all the soils investigated not only in the top layer but also in the deeper layers, being extremely significant in the 0～10 cm layer and significant in the 10～4. cm layers. The salt contents in the plastic greenhouses had significant correlations with the soil available nitrogen and phosphorous. Soils with longer plastic greenhouse gardening time tended to have more salt. The plastic greenhouse soils contained less CO-3～(2-) and much more NO-3 than the open soils, which indicated a higher influence of human intervention in plastic greenhouses. Among the constituent ions, Cl～(-), NO-3～(-) , Ca～(2+) and Mg～(2+) had positive while HCO-3～(-) had negative significant or extremely significant correlations with total salt, with correlation coefficients being 0.66*, 0.80**, 0.92**, 0.80** and -0.64. , respectively. Nitrate decreased from the top to deeper layers both in the plastic greenhouses and in the open fields. The plastic greenhouse soils contained much more nitrate than the open fields in every layer and even the nitrate contents of the 80～l00 cm layer were still several times those of the top layer in the open fields. The main reason for the salt increases was considered to be the inappropriate fertilization and selective absorption of nutrients by plants in the plastic greenhouses. The methods recommended to avoid soil salt increase in the plastic greenhouses were to apply fertilizers rationally according to the soils, veget

关键词： fertilization nitrate plastic greenhouse salt content vegetable

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Storage and Spatial Variation of Phosphorus in Paddy Soils of china

引用

Pedosphere 2009年第6期19卷 790-798页

作者： LIN Jin-Shi SHI Xue-Zheng LU Xi-Xi YU Dong-Sheng WANG Hong-Jie ZHAO Yong-Cun SUN Wei-Xia State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 2100(78 (China) Department of Geography National University of Singapore 119260 (Singapore) Graduate university of the Chinese Academy of Sciences Beijing 100049 (China) College of resources and environment Fujian Agriculture and Forestry University Fuzhou 350002 (China)

Due to the growing concern about the agricultural phosphorus (P) losses pollution, an in-depth understanding of P in paddy soils of china would be helpful in providing a national perspective of the environmental impact of P cycling and fertility on china's farms. In this study, we evaluated the P storage and the P density of paddy soils in china, characterized the spatial variations of P among the subgroups of paddy soils and soil regions in china, and evaluated the P data using GIS-based analysis, which included a newly compiled 1:1 000 000 digital soil map of china, and using 1 4.0 soil profiles. The available and total P densities of paddy soils were 6.7 and 698.5 g m -3 , respectively. Overall in china, the total P storage within 1 m of paddy soils was estimated to be 330.2 Tg. The P density of paddy soils varied substantially with subgroups due to the different soil water regimes such as groundwater table and soil drainage. The P availability in paddy soils, especially in surface layer, was higher in high temperature and precipitation areas. Further research is needed to examine more anthropogenic impact factors, such as increasing use of chemical fertilizer.

关键词： paddy soil database paddy soil subgroups phosphorus density phosphorus pool

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：