检索结果-南通市图书馆

Irrigation system and land use effect on surface water quality in river, at lake Dianchi, Yunnan, China

Journal of Environmental Sciences 2013年第6期25卷 1107-1116页

作者： Takashi Tanaka Takahiro Sato Kazuo Watanabe Ying Wang Dan Yang Hiromo Inoue Kunzhi Li Tatsuya Inamura Graduate School of Agriculture Kyoto University Biotechnology Research Center Kunming University of Science and Technology Crop and Environmental Sciences Division International Rice Research Institute Center for Southeast Asian Studies Kyoto University

The surface water samples were collected in river Dahe and its tributaries, which flow into severely eutrophic lake Dianchi, Yunnan Province, China, in order to elucidate factors controlling water quality fluctuations. The temporal and spatial distribution of water quality tendency was observed. The water quality of each river is dependent on the hydrology effect such water gate and circulating irrigation system. We must consider the hydrology effect to accurately understand water quality variations of river in this study field. In river without highly circulating irrigation system or water gate effect, the downstream nitrate nitrogen （NO3-N） concentration increase occurred in area dominated by open field cultivation, whereas the NO3-N concentration was constant or decreased in area dominated by greenhouse land use. This result suggests that greenhouse covers the soil from precipitation, and nitrate load of greenhouse could be less than that of open field cultivation while the rainfall event. In the upper reaches of river, where is dominated by open field cultivation, there were no sharp increase dissolved molybdate reactive phosphorus and total phosphorus concentration, but P load was accumulated in the lower reaches of river, whose predominant land use is greenhouse. Although the P sources is unclear in this study, greenhouse area may have potential of P loads due to its high P content in greenhouse soil. Considering hydrology effect is necessary to determine what the major factor is influencing the water quality variation, especially in area with highly complicated irrigation system in this studying site.

关键词： lake Dianchi eutrophication surface water quality land use plastic greenhouse circulating irrigation

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

Multivariate statistical analysis for the surface water quality of the Luan River,China

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第1期10卷 142-148页

作者： Zhi-wei ZHAO Fu-yi CUI State Key Laboratory of Urban water Resource and Environment Harbin Institute of Technology Harbin 150090 China

In order to analyze the characteristics of surface water resource quality for the reconstruction of old water treatment plant,multivariate statistical techniques such as cluster analysis and factor analysis were applied to the data of Yuqiao Reservoir-surface water resource of the Luan River,*** results of cluster analysis demonstrate that the months of one year were divided into 3 groups and the characteristic of clusters was agreed with the seasonal characteristics in North *** factors were derived from the complicated set using factor *** 1 included turbidity and chlorophyll,which seemed to be related to the anthropogenic activities;factor 2 included alkaline and hardness,which were related to the natural characteristic of surface water;and factor 3 included Cl and NO2-N affected by mineral and agricultural *** sinusoidal shape of the score plots of the three factors shows that the temporal variations caused by natural and human factors are linked to seasonality.

关键词： surface water quality Cluster analysis Factor analysis Temporal variation of scores

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

A Method for the Environmental quality Assessment of surface water Based on Artificial Neural Networks

引用

Systems Science and Systems Engineering 2000年第1期10卷 72-76页

作者： YANG Guo\|dong\+1,\ PAN Da\|feng\+2,\ FAN Ying\|fang\+3 1.Dep. of Environmental Science, Shanxi Uni., Taiyuan 030006, China 2.Shanxi Academy of Agriculture Science, Taiyuan 030031, China 3.Institute of Molecular Science, Shanxi Uni., Taiyuan 030006, C

An assessment method for the environmental quality of surface water was established based on artificial neural networks (ANN), in which different classification values were trained as learning samples. The assessment results from the major river section in Datong city indicated that the ANN model have characteristics of simple operation and distinct and quantitative expression of assessment results in comparison with the standard index method for the environmental quality assessment of surface water.

关键词： artificial neural newtorks back propagation algorithm surface water quality comprehensive assessment

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

The river chief system and agricultural non-point source water pollution control in China

引用

Journal of Integrative Agriculture 2021年第5期20卷 1382-1395页

作者： ZHOU Li LI Ling-zhi HUANG Ji-kun College of Economics and Management Nanjing Agricultural UniversityNanjing 210095P.R.China China Center for Agricultural Policy School of Advanced Agricultural SciencesPeking UniversityBeijing 100871P.R.China Jiangxi Agricultural University Nanchang 330045P.R.China

As part of their efforts to control water pollution,local governments in China introduced the river chief system,whereby a named individual undertakes responsibility for protecting a specified *** one of the most prominent sources of water pollution,agricultural non-point-source(NPS)pollution is becoming increasingly *** whether the river chief system,an institutional reform in China's decentralized environmental regulation regime,is effective in alleviating NPS pollution is important for the realization of green *** effect of the river chief system on reducing agricultural NPS pollution is explored in this study using panel data from 308 Chinese counties during the period from 2004 to *** results reveal that the negative impact of manure output from animal breeding operations on surface water quality is reduced with the implementation of the river chief ***,the river chief system is ineffective in dealing with the water pollution caused by fertilizer ***,in the current system,cooperation among river chiefs only occurs within a *** governments should increase their efforts in reducing fertilizer source loads and preventing fertilizer loads from entering surface *** addition,the central government should improve cooperation among the river chiefs in upstream and downstream provinces.

关键词： river chief system agricultural non-point-source pollution surface water quality fertilizer use livestock and poultry breeding

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

Fuzzy Synthetic Evaluation of water quality of Naoli River Using Parameter Correlation Analysis

引用

Chinese Geographical Science 2008年第4期18卷 361-368页

作者： WANG Jianhua LU Xianguo TIAN Jinghan JIANG Ming Key Laboratory of Wetland Ecology and En vironment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Hebei Cangzhou Teacher＇s College Cangzhou 061001 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

In order to improve the effectiveness of Fuzzy Synthetic Evaluation (FSE) models, a Parameter Correlation Analysis (PCA) was introduced into the FSE and a case study was carried out in the Naoli River in the Sanjiang Plain, Northeast China. The basic principle of the PCA is that the pairs of parameters which are highly correlated and linear with each other would contribute the same information to an assessment and one of them should be eliminated. The method of the PCA is that a correlation relationship among candidate parameters is examined before the FSE. If there is an apparent nonlinear or curvilinear relationship between two parameters, then both will be retained; if the correlation is significant (p<0.01), and the scatter plot suggests a linear relationship, then one of them will be deleted. However, which one will be deleted? For solving this problem, a sensitivity test was conducted and the higher sensitivity parameters remained. The results indicate that the original data should be preprocessed through the PCA for redundancy and variability. The study shows that introducing the PCA into the FSE can simplify the FSE calculation process greatly, while the results have not been changed much.

关键词： Parameter Correlation Analysis (PCA) Fuzzy Synthetic Evaluation (FSE) surface water quality Naoli River Sanjiang Plain

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

Development of a New Index for Integrating Landscape Patterns with Ecological Processes at watershed Scale

引用

Chinese Geographical Science 2009年第1期19卷 37-45页

作者： CHEN Liding TIAN Huiying FU Bojie ZHAO Xinfeng State Key Laboratory of Urban and Regional Ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Understanding the relationship between landscape pattems and ecological processes has been a central yet challenging research theme in landscape ecology. Over the past decades, many landscape metrics have been proposed but few directly incorporated ecological processes. In this paper, we developed a landscape index, namely, location-weighted landscape index （LWLI） to highlight the role of landscape type in ecological processes, such as nutrient losses and soil erosion. Within the framework of the Lorenz curve theory, we develop this index by integrating land- scape pattern and point-based measurements at a watershed scale. The index can be used to characterize the contribution of landscape pattern to ecological processes （e.g. nutrient losses） with respect to a specific monitoring point in a watershed. Through a case study on nutrient losses in an agricultural area in northeastern China, we found that nutrient losses tended to be higher for a watershed with a higher LWLI value, and vice versa. It implied that LWLI can be used to evaluate the potential risk of nutrient losses or soil erosion by comparing their values across watersheds. In addition, this index can be extended to characterize ecological processes, such as the effect of landscape pattern on wildlife inhabitation and urban heat island effect. Finally, we discuss several problems that should be paid attention to when applying this index to a heterogeneous landscape site.

关键词： landscape pattern location-weighted landscape index (LWLI) Lorenz curve theory nutrient loss surface water quality

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

Using Isotope Technology for surface water Environment Research in Southern Hanoi

引用

Journal of Environmental Protection 2016年第8期7卷 1113-1118页

作者： Vo Thi Anh Tran Khanh Minh Trinh Van Giap Ha Lan Anh Nguyen Thanh Cong Nguyen Hong Thinh Vu Hoai Institute for Nuclear Science and Technology Hanoi Vietnam Vinh University Vinh Vietnam

The surface water in the southern of Hanoi capital is researched by identifying δ2H and δ18O stable isotopes together with EC, DO, BOD5, COD, TSS. surface water samples for studying include the Red river, Nhue river and Kim Nguu river, Thanh Nhan lake, Yen So lake and Van Quan lake were collected in the dry season (April) and the rainy season (August) in 2015. The stable isotope analysis results showed that the δ18O values is a range from -42.53‰ to -64.05‰ and, the δ2H values is the range from -5.09‰ to -8.79‰ under global meteoric waterline (in the water vapor region). The δ2H results of the rivers and lakes in the dry season are more negative than the rainy season with a small difference. The δ18O results of lakes in the dry season are more negative than the rainy season, but the δ18O results of river in the dry season are more positive than the rainy season. The results of the EC, BOD, COD, DO, TSS analysis showed that surface water environment has changed clearly in the two seasons and the contamination level in the dry season is usually higher than the rainy season. The lakes and rivers strongly influenced by human activities led to seriously pollution are Van Quan lake and Yen So lake, Nhue river and Kim Nguu river.

关键词： Isotope Technology surface water quality Change in Difference Seasons

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Determination of Nutrient Concentrations in Simulated Rainfall-Runoff from Poultry House Dust Deposited Adjacent to Exhaust Fans

引用

Journal of Environmental Protection 2016年第1期7卷 27-40页

作者： Sheri L. Herron Andrew N. Sharpley Kristofor R. Brye David M. Miller Susan Watkins David McCreery Mike B. Daniels Department of Crop Soil and Environmental Sciences University of Arkansas Fayetteville AR USA Center of Excellence for Poultry Science University of Arkansas Fayetteville AR USA Pilgrim’s Pride Gainesville GA USA Department of Crop Soil and Environmental Sciences South University Ave. Little Rock AR USA

Until recently, little attention has been given to the loss of nutrients that may occur in stormwater runoff from poultry houses. Dust emitted from poultry house fans and deposited near the fans has been shown to contain similar amounts of phosphorus (P) and nitrogen (N) as in poultry litter, thus, there is need for information on the potential of runoff to transport deposited dust off-site. The objectives of this study are to quantify P and N in simulated rainfall-runoff from sites immediately adjacent to fans (sidewall and tunnel) from a commercial poultry house in northwest Arkansas. Runoff from fan plots range in total P (TP) and total N (TN) concentration from 1.0 to 26.0 mg·L-1 and from 5.1 to 189 mg·L-1. The concentration of P and N in runoff from plots adjacent to sidewall fans is significantly lower (P -1 for TP and TN, respectively) than cooler months (November through March;3 and 7 mg·L-1 for TP and TN, respectively). In contrast, TP and TN concentrations of runoff from tunnel fan plots are significantly greater (P -1, respectively) than cool months (5 and 60 mg·L-1, respectively). The results of this research indicate that conservation practices are needed around poultry production houses to minimize the potential for runoff of nutrients in emitted dust entering nearby surface waters.

关键词： Broiler House Dust Broiler Litter Nutrient Runoff surface water quality

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Spatial and Temporal Analyses of water quality in the Dhrabi watershed of Pakistan： Issues and Options

引用

Journal of Environmental Science and Engineering(A) 2012年第3期1卷 329-340页

作者： Muhammad Ashraf Theib Y. Oweis Abdur Razzaq Bashir Hussain Abdul Majid International Center for Agricultural Research in the Dry Areas （ICARDA） National Agricultural Research Centre lslamabad 44000 Pakistan International Center for Agricultural Research in the Dry Areas （ICARDA） Aleppo 15310 Syria Soil and water Conservation Research Institute （SA WCRI） Chakwa148800 Pakistan

Monitoring water quality is important for maintaining a healthy watershed, but it is mostly ignored in watershed planning and management. In the Dhrabi watershed of Pakistan, the quality of surface water was monitored at 16 locations to assess suitability for irrigation over regular intervals during the period 2007-2010. Similarly, groundwater quality was monitored at 10 locations for drinking and irrigation purposes. There was high spatial and temporal variability in surface water quality. Electrical conductivity （EC） and residual sodium carbonate （RSC） either exceeded or fluctuated around permissible limits at most of the locations throughout the monitoring period. Therefore, the use of such water for irrigation needs special care, otherwise its prolonged use may pose soil salinity and sodicity problems. The trend of EC and RSC for groundwater was similar to that for surface water. Exchangeable Mg2＋ exceeded permissible limits for most of the surface water and groundwater samples. In addition, microbial analysis of groundwater revealed that only two out of eight monitoring points during August 2009, none out of eight points during February 2010, and one out of nine points during June 2010 provided water fit for drinking. Soil samples were collected from the catchment areas of the major contributing streams and from the beds of the Kallar Kahar Lake and the Dhrabi Reservoir. The soil samples from the catchments showed high salinity and sodicity that may be the cause of high salinity and sodicity in the streams. The highest EC, sodium adsorption ratio （SAP,） and exchangeable sodium percentage （ESP） in the bed samples from the Kallar Kahar Lake were about 43 dS/m, 56, and 45, respectively. These high values were due to the saline water brought into the lake with the runoff.

关键词： surface water quality groundwater quality drinking water quality wastewater.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

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

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

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：