检索结果-南通市图书馆

Preliminary study on assessment of nutrient transport in the Taihu Basin based on SWAT modeling

Science China Earth Sciences 2006年第Z1期49卷 135-145页

作者： LAI Geying, YU Ge & GUI Feng Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China The Graduate School of the Chinese Academy of Sciences, Beijing 100039, China key lab of poyang lake ecological environment and resource development, Jiangxi Normal University, Nanchang 330027, China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing China The Graduate School of the Chinese Academy of Sciences Beijing China key lab of poyang lake ecological environment and resource development Jiangxi Normal University Nanchang China

With the Taihu Basin as a study area, using the spatially distributed and mechanism-based SWAT model, preliminary simulations of nutrient transport in the Taihu Basin during the period of 1995～2002 has been carried out. The topography, soil, meteorology and land use with industrial point pollution discharge, the loss of agricultural fertilizers, urban sewerage, and livestock drainages were all considered in the boundary conditions of the simulations. The model was calibrated and validated against water quality monitoring data from 2001 to 2002. The results show that the annual total productions of nitrogen (TN) and phosphorus (TP) into lake Taihu are 40000t and 2000t respectively. Nutrient from the Huxi Region is a major resource for lake Taihu. The non-point source (surface source) pollution is the main form of catchment sources of nutrients into lake Taihu,occupied TN 53% and TP 56% respectively. TN and TP nutrients from industrial point pollution discharge are 30% and 16%, and sewerage in both forms of point source and non-point source are TN 31% and TP 47%. Both the loss of agricultural fertilizers and livestock drainages from the catchment should be paid more attention as an important nutrient source. The results also show that SWAT is an effective model for the simulation of temporally and spatially nutrient changes and for the assessment of the trends in a catchment scale.

关键词： Taihu Basin, nutrients, catchment resource inputs, SWAT model, simulation.

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 preliminary knowledge-driven prediction model of snail distribution in the poyang lake region

引用

Chinese Science Bulletin 2008年第1期53卷 115-123页

作者： ZHAO An1,2,3 & BAO ShuMing1 1 The key lab of poyang lake ecological environment and resource development, Jiangxi Normal University, Nanchang 330022, China 2 Institute of Geographic Sciences and resources Research, Chinese Academy of Sciences, Beijing 100101, China 3 School of Geography and environmental Sciences, Jiangxi Normal University, Nanchang 330022, China The key lab of poyang lake ecological environment and resource development Jiangxi Normal University Nanchang China Institute of Geographic Sciences and resources Research Chinese Academy of Sciences Beijing China School of Geography and environmental Sciences Jiangxi Normal University Nanchang China

Present monitoring and prediction of schistosomiasis’s intermediate parasite, snail, are based on re-mote sensing image’s spectral signatures, and the calculation result is in fact an incom-plete-constraints solution. TM image of the poyang lake region on October 31, 2005 was combined with GIS thematic data (DEM, boundary of the poyang lake, vegetation, soil and land use) to make a prediction on snail spatial distribution in the region by remote sensing, geo-informatics and knowl-edge-driven modeling according to mechanism of snail occurrence. Result shows that with change of overall fuzzy membership of snail occurrence from high to low, snail occurrence of the snail samples of validation group goes up to 81% within 10% high fuzzy membership range, denoting high efficiency of the model in predicting snail occurrence.

关键词：鄱阳湖区域蜗牛分布模糊分类血吸虫病

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

Expert Classification Method Based on Patch-Based Neighborhood Searching Algorithm

引用

Geo-Spatial Information Science 2007年第1期10卷 37-43页

作者： CHEN Xiaoling CAI Xiaobin LI Hui key laboratory of lake poyang ecological environment and resource development Jiangxi Normal University 99 Ziyang Road Nanchang 330022 China State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079China.

The expert knowledge has been widely used to improve the remotely sensed classification accuracy. Generally, the ex-pert classification system mainly depends on DEM and some thematic maps. The spatial relationship information in pixel level was commonly introduced into the expert classification. Because the geographic objects were found spatially dependent relationship to a certain degree, the commonly used basic unit of spatial relationship information in pixel greatly limited the efficiency of spatial in-formation. A patch-based neighborhood searching algorithm was proposed to implement the expert classification. The homogene-ous spectral unit, patch, was used as the basic unit in the spatial object granularity, and different types of patches' relationship in-formation were obtained through a spatial neighborhood searching algorithm. And then the neighborhood information and DEM data were added into the expert classification system and used to modify the primitive classification errors. In this case, the classi-fication accuracies of wetland, grassland and cropland were obviously improved. In this work, water was used as base object, and different types of water extraction methods were tested to get a result in a high accuracy.

关键词：曲面邻域搜索算法专家分类法空间关系空间飞行器遥感

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 impact of geomorphology of marsh creeks on fish assemblage in Changjiang River estuary

引用

Chinese Journal of Oceanology and Limnology 2014年第2期32卷 469-479页

作者：金斌松许旺郭立陈家宽傅萃长 Center for Watershed Ecology Institute of Life Science and Key Laboratory of Poyang Lake Environment and Resource UtilizationMinistry of EducationNanchang University Ministry of Education key laboratory for Biodiversity Science and ecological Engineering Institute of Biodiversity ScienceFudan University State key laboratory of Earth Surface Process and resource Ecology Beijing Normal University

Tidal marshes are an important habitat and nursery area for fi sh.In the past few decades,rapid economic development in the coastal areas of China has led to the interruption and destruction of an increasing number of tidal marshes.The growing interest in tidal marsh restoration has increased the need to understand the relationship between geomorphological features and fi sh assemblages in the design of marsh restoration projects.We studied temporal variations in,and the effects of creek geomorphological features on,the estuarine tidal creek fi sh community.Using modifi ed channel nets,we sampled fi sh monthly from March 2007 to February 2008 from seven tidal creeks along an intertidal channel system in Chongming Dongtan National Nature Reserve.Fourteen creek geomorphological variables were measured or derived to characterize intertidal creek geomorphological features.The Gobiidae,with 10 species,was the most speciesrich family.The most abundant fi sh species were Liza affi nis,Chelon haematocheilus,and Lateolabrax maculatus.The fi sh community was dominated by juvenile marine transients,which comprised about 80% of the total catch.The highest abundance of fi sh occurred in June and July,and the highest biomass occurred in December.Canonical redundancy analyses demonstrated that depth,steepness,cross-sectional area,and volume signifi cantly affected the fi sh species assemblage.L.affi nis favored small creeks with high elevations.Synechogobius ommaturus,Acanthogobius luridus,and Carassius auratus preferred deep,steep creeks with a large cross-sectional area and volume.These fi ndings indicate that the geomorphological features of tidal creeks should be considered in the conservation and sustainable management of fi sh species and in the restoration of salt marshes.

关键词：鱼类群落地形地貌沼泽溪流长江口自然保护区横截面面积群聚

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

Atmospheric correction of HJ-1A/B CCD images over Chinese coastal waters using MODIS-Terra aerosol data

引用

Science China(Technological Sciences) 2010年第S1期53卷 191-195页

作者： TIAN LiQiao 1,LU JianZhong 1,CHEN XiaoLing 1,2,3,YU ZhiFeng 1,XIAO JingJing 1,QIU Feng 1 & ZHAO Xi 1 1 State key laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China 2key laboratory of poyang lake Wetland and Watershed Research,Ministry of Education,Jiangxi Normal University,Nanchang 330022,China 3 The key laboratory of poyang lake environment and resource Utilization,Ministry of Education,Nanchang University,Nanchang 330031,China State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan China key laboratory of poyang lake Wetland and Watershed Research Ministry of Education Jiangxi Normal University Nanchang China The key laboratory of poyang lake environment and resource Utilization Ministry of Education Nanchang University Nanchang China

This paper demonstrates an atmospheric correction method to process HJ-1A/B CCD images over Chinese coastal waters with the aid of MODIS-Terra aerosol information.Based on the assumption of zero water-leaving radiance at the two near-infrared (NIR)bands or the shortwave infrared(SWIR)bands,the atmospheric aerosol optical depth(AOD)is firstly retrieved from MODIS-Terra with a simple extension of the NIR-SWIR combined atmospheric correction approach embedded in SeaDAS (SeaWiFS data analysis system).Then the"turbid"and"non-turbid"waters are separated by the turbid water index.Maximum probability of AOD at 551 nm band is derived based on the NIR information over"non-turbid"waters and FLAASH model is selected to do the atmospheric correction of the HJ-1A/B CCD imagery using the AOD values of highest probabilities as input.Similarly,according to the histogram of the AOD distribution at 551 nm band,the studied turbid water area is divided into several blocks and HJ-1A/B CCD imagery is corrected with the corresponding AOD values displayed with the highest frequency in each block.This method has been applied to several HJ-1A/B images over Chinese coastal waters and validated by synchronous in-situ data.The results have shown that this method is effective in the atmospheric correction process of HJ-1A/B CCD images for ocean color remote sensing study and application in the coastal waters.

关键词： ocean color remote sensing atmospheric correction turbid coastal waters HJ-1A/B MODIS

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

Atmospheric correction of ocean color imagery over turbid coastal waters using active and passive remote sensing

引用

Chinese Journal of Oceanology and Limnology 2009年第1期27卷 124-128页

作者：田礼乔陈晓玲张亭禄龚威陈莉琼陆建忠赵羲张伟于之锋 State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University The key lab. of poyang lake environment and resource Utilization Ministry of Education Nanchang University The key laboratory of poyang lake Wetland and Watershed Research Ministry of Education Jiangxi Normal University laboratory of Ocean Remote Sensing Ministry of Education Ocean Remote Sensing Institute Ocean University of China

This paper demonstrates an atmospheric correction method to process MODIS/Aqua (Moderate-resolution Imaging Spectroradiometer) ocean color imagery over turbid coastal waters with the aid of concurrent CALIOP (Cloud-Aerosol LIdar with Orthogonal Polarization) aerosol data, assuming that there exists "nonturbid" water in the study area where MODIS aerosol optical properties can be retrieved accurately. Aerosol properties from CALIOP measurements were obtained and related to those from MODIS. This relationship, combined with CALIOP aerosol data, was extended to turbid water to derive MODIS aerosol properties, where atmospheric correction using MODIS data alone often fails. By combining MODIS and CALIOP data, aerosol signals were separated from the total signals at the satellite level, and water-leaving radiances in turbid waters were subsequently derived. This method was tested on several MODIS/Aqua ocean color images over South China turbid waters. Comparison with field data shows that this method was effective in reducing the errors in the retrieved water-leaving radiance values to some extent. In the Zhujiang (Pearl) River Estuary, this method did not overestimate the aerosol effects as severely, and provided far fewer negative water-leaving radiance values than the NASA (National Aeronautics and Space Administration) default methods that used MODIS data alone.

关键词：沿海水域海洋水色大气校正彩色图像美国国家航空航天局 MODIS数据被动遥感中分辨率成像光谱仪

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

Assessment of Soil Erosion and Sediment Yield in Liao Watershed, Jiangxi Province, China, Using USLE, GIS, and RS

引用

Journal of Earth Science 2010年第6期21卷 941-953页

作者：李辉陈晓玲 Kyoung Jae Lim 蔡晓斌 Myung Sagong Faulty of Earth Sciences China University of Geosciences Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences The key lab of poyang lake ecological environment and resource development Jiangxi Normal University State key laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Department of Agricultural Engineering Kangwon National University Institute of Geodesy and Geophysics Chinese Academy of Sciences Track & Civil Engineering Research Department Korea Railroad Research Institute

Soil erosion by water is a serious problem all over the world. In China, about 1 790 000 km2 of land suffers from water erosion, which accounts for 18.3% of China＇s total area. This study was conducted in the Liao （潦） watershed in Jiangxi （江西） Province to assess annual soil erosion and sediment yield using the Universal Soil Loss Equation （USLE）. A geographic information system （GIS） was used to generate maps of the USLE factors, which include rainfall erosivity （R）, soil erodibility （K）,slope length and steepness （LS）, cover （C）, and conservation practice （P） factors. By integrating these factors in a GIS, a spatial distribution of soil erosion over the Liao watershed was obtained. The soil erosion was found to vary from nil for flat and well-covered areas to more than 500 t/ha/a in mountainous places with sparse vegetation. The average soil erosion is 18.2 t/ha/a with a standard deviation of 109.3 t/ha/a. The spatial distribution of erosion classes was estimated. About 39.5% of the watershed is under the tolerant erosion rate, and 60.5% of the study area experienced erosion to different extents. A spatially distributed sediment delivery ratio （SDR） module was developed to account for soil erosion and deposition. It was found that the SDR value at the outlet of the Liao watershed was 0.206, and the sediment yield was 1.32 million t/a, which was 20% higher than the measured sediment. The results can be used to identify the soil erosion hot spots and develop the best soil erosion management practices and help estimate the quantity of soil that was transported into the downstream poyang （鄱阳） lake.

关键词： soil erosion USLE GIS sediment delivery ratio.

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

L-Prolinamide Catalyzed Aqueous Direct Aldol Reaction： an environment-friendly Method for the Synthesis of β- Hydroxyl keto nes

引用

Chinese Journal of Chemistry 2007年第7期25卷 962-967页

作者：彭以元刘汉崔明程津培 key laboratory of Green Chemistry Jiangxi Province and Department of Chemistry Jiangxi Normal University Nanchang Jiangxi 330027 China Department of Chemistry and State key laboratory of Elemento-organic Chemistry Nankai University Tianjin 300071 China key laboratory of poyang lake ecological environment and resource development Jiangxi Normal University Nanchang Jiangxi 330027 China

环境友好的 L-prolinamide 催化丁间醇醛反应被开发了。反应展出了宽广底层概论，并且有好 diastereoselectivity 的高收益为周期的酉同类被获得。产品隔离的简洁，是的水的用法环境地良性的反应媒介，和用法便宜，容易地可得到并且 rec... 详细信息

环境友好的 L-prolinamide 催化丁间醇醛反应被开发了。反应展出了宽广底层概论，并且有好 diastereoselectivity 的高收益为周期的酉同类被获得。产品隔离的简洁，是的水的用法环境地良性的反应媒介，和用法便宜，容易地可得到并且 recyclable 催化剂使这个过程有希望为氢氧根酉同类的大规模准备被发展。

关键词：丁间醇醛反应绿化学脯氨酰胺环境方法

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

Interactive effects of warming and eutrophication on zooplankton could reverse the stoichiometric mismatch with phytoplankton

Water Biology and Security

引用

Water Biology and Security 2023年第4期2卷 45-52页

作者： Konghao Zhu Huan Zhang Peiyu Zhang Panpan Wang Hailu Li Mingjun Feng Huan Wang Hongxia Wang Min Zhang Jun Xu State key laboratory of Freshwater Ecology and Biotechnology of China Institute of HydrobiologyChinese Academy of SciencesWuhan430072China College of Fisheries Huazhong Agricultural UniversityEngineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic BeltMinistry of EducationHubei Provincial Engineering Laboratory for Pond AquacultureWuhanChina key laboratory of poyang lake environment and resource Utilization of Ministry of Education Nanchang UniversityNanchangChina University of Chinese Academy of Sciences Beijing100049China

The core ecosystem functioning(e.***.trophic transfer efficiency)is at risk of being disrupted by the growing mismatch between nutrient content of primary producers and nutrient demand of grazing consumers.ecological stoichiometry provides a conceptual framework that explains this trophic interaction using C,N and P elemental composition across trophic levels.In light of ongoing climate change and eutrophication,previous studies have raised concerns regarding the growing stoichiometric mismatch between phytoplankton and zooplankton,given the stoichiometric plasticity of phytoplankton.However,there is currently little conclusive evidence on the stoichiometric mismatch from a dual perspective of phytoplankton and zooplankton.To address this,we conducted a mesocosm experiment to investigate the separate and combined effects of climate warming(a constant increase of t3.5C plus heat waves)and eutrophication(nutrient addition)on stoichiometric mismatch between phytoplankton and zooplankton by examining stoichiometric changes in both communities.We observed a growing trend in stoichiometric mismatches when warming or nutrient addition acted individually,which was mediated by the increase in nutrient demand(N,P elements)of zooplankton growth.However,when these stressors acted jointly,the mismatches were reversed.This could be because climate warming and eutrophication combined would lead to changes in species composition,which accordingly reshaped the stoichiometric composition at the community level.These results illustrate the need of stoichiometric mismatches for understanding the implication of global change on trophic interactions and ecosystem functioning,requiring consideration not only of cross-trophic levels but also of compositional changes within communities.

关键词： Climate warming ecological stoichiometry Eutrophication Stoichiometric mismatch Trophic interaction

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

Spatiotemporal analysis of land use/cover changes in Nanchang area, China

引用

International Journal of Digital Earth 2015年第4期8卷 312-333页

作者： Yang Zhang Bing Xu State key laboratory of Remote Sensing College of Global Change and Earth System ScienceBeijing Normal UniversityBeijingChina School of resource and environment Fujian Agriculture and Forestry UniversityFuzhouChina School of environment Tsinghua UniversityBeijingChina Department of Geography University of UtahSalt Lake CityUTUSA College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China

Based on remote sensing and Geographic Information System techniques,multi-temporal Landsat data were used to monitor land use/cover changes(LUCC)in the Nanchang area during 1989–2010.Quantitative and spatiotemporal indicators derived from the transition matrix for overall changes,intensity analysis for inter-category transitions,and spatiotemporal analysis of intra-category variations were constructed to analyze the spatiotemporal LUCC evolution.The study results show that urban and industrial land rapidly and continually expanded.The spatial extent of rural settlements shrunk while their distribution density increased.Cultivated land showed a tendency of spatially continuous loss and fragmented distribution,whereas the spatial pattern of forest tended to concentrate.The extents of ponds and reservoirs remained stable,but spatial changes were obvious.Rivers and bottomlands decreased significantly and tended toward fragmentation.The overall LUCC pattern showed that construction land rapidly sprawled while cultivated land decreased substantially,indicating an acceler-ating stage of urbanization and industrialization.Although rigid land requirements for urbanization had to be satisfied,land development and consolidation across forests and water body areas,as well as adjustment of agricultural structure,laid the foundation for a transition toward intensive land use in the Nanchang area.

关键词： land use/cover change spatiotemporal pattern remotely sensed data GIS Nanchang area poyang lake ecological Economic Region

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

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：