检索结果-南通市图书馆

Spacial organization on the rural settlements in plain areas—taking Pinghu city in Zhejiang of china as an example

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical sciences 2000年第3期10卷 59-64页

作者： XUE Dong-qian1, YAO Shi-mou2, ZHANG Hong1 (1. Dept. of Tourism and Environment, Shaanxi Normal University, Xi’an 710062, china 2. nanjing institute of geography and limnology, chinese academy of sciences, nanjing 210008, china)

This paper analyses the spacial distribution, quantity-scale, function-structure and facilities from the angle of spacial organizational optimizing theory and sustainable development thought. The authors point out the distributional principles of rural settlements in plain areas, and put forward planning and distribution of various levels of rural settlements (central villages, basic villages and natural villages).

关键词： plain area central villages basic villages natural villages spacial organization

在线全文

学校读者我要写书评

暂无评论

近几十年我国极端气温变化特征分区方法探讨

山地学报 2006年第3期24卷 291-297页

作者：刘吉峰李世杰丁裕国姚书春中国科学院南京地理与湖泊研究所南京信息工程大学中国科学院南京地理与湖泊研究所江苏南京210008 中国科学院研究生院北京100039 江苏南京210044

采用聚类统计检验分析和旋转主分量分析相结合确定中心站的方法,利用我国多年极端气温资料,对我国最高和最低气温年际变化型态进行区划。结果表明,这两种方法结合可以互相补充,使分区结果更具客观性。中国极端高温和极端低温年际变化分... 详细信息

采用聚类统计检验分析和旋转主分量分析相结合确定中心站的方法,利用我国多年极端气温资料,对我国最高和最低气温年际变化型态进行区划。结果表明,这两种方法结合可以互相补充,使分区结果更具客观性。中国极端高温和极端低温年际变化分别可划为12和11个不同类型的区域,分别计算了各区域第一主成分的方差贡献率以及各区域之间的两两相关系数,检验证明分区是合理的。

关键词：极端气温聚类统计检验旋转主分量分析

Sediment records of persistent organic pollutants (POPs) in relation to regional economic development: A comparison study in both Pearl River Delta and Yangtze River Delta, china

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 188-189页

作者： Gan ZHANG1, Lingli GUO1, Guoqing LIU1, Jun LI1, Zhangdong JIN2, Shihua QI3, Xiangdong LI4 1 State Key Laboratory of Geochemistry, Guangzhou institute of Geochemistry, chinese academy of sciences, Guangzhou 510640, china 2 nanjing institute of limnology and geography, chinese academy of sciences, nanjing 210008, china 3 School of Environmental sciences, china University of Geosciences, Wuhan 430074, china 4 Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, china

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

青眉山溶洞旅游景观的成因分析

山地学报 2000年第6期18卷 572-575页

作者：李波曾胜贤屈晓斌杨海王晓东王聪中科院南京地理与湖泊研究所!南京210008 内江师院地理系四川内江641112 资中县环保局!四川资中641200 内江师院地理系!四川内江641112 内江市环保局!四川内江641000

介绍了青眉山溶洞的岩溶景观、文物古迹及其旅游开发价值 ,重点从地史、岩性、地质构造等方面分析了该洞及其景观的成因。研究认为 ,景观边际效应是该溶洞旅游景观形成的主要原因 ,至于该洞对于全球变化、古气候重建的研究意义 ,尚待进... 详细信息

介绍了青眉山溶洞的岩溶景观、文物古迹及其旅游开发价值 ,重点从地史、岩性、地质构造等方面分析了该洞及其景观的成因。研究认为 ,景观边际效应是该溶洞旅游景观形成的主要原因 ,至于该洞对于全球变化、古气候重建的研究意义 ,尚待进一步的考证

关键词：青眉山岩溶景观景观边际效应成因

THREEDIMENSIONAL NUMERICAL SIMULATION OF WINDINDUCED CIRCULATION IN LAKE TAIHU

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2004年第3期16卷 341-349页

作者： LUOLian-cong QINBo-qiang nanjinginstituteofgeographyandlimnology ChineseAcademyofSciencesNanjing210008China

A three-dimensional (3-D) numerical circulation model for shallow-lake ispresented and described in detail in this paper, which employs model-splitting technique in order tocalculate water level, mean-depth velocities and horizontal and vertical velocities at differentdepth simultaneously. The results show the current circulation pattern features four eddies with twoclockwise and two anticlockwise induced by prevailing wind. Opposite wind field will lead toopposite current pattern with phase shifted by 180° The surface convergence zone is located in theupwind area and the surface divergence part in the downwind region, This results in drastic verticalmovement in the two zones and the return currents at the bottom with phase shifted by 180° fromthe surface current vectors. Thus the water level decreases significantly at the leeward side andincreases quickly at the windward part. Verification and calibration for the model were made basedon the water-level and current data observed during the 9711 Storm in Lake Taihu. The predictedresults are in satisfactory agreement with the observed data, which raises the possibility that thismodel can be used to decide the bottom current stress for sediment resuspension and also tosimulate sediment transportation. It can provide a fundamental tool to study the nutrient releasefrom bottom sediment in Lake Taihu.

关键词： numerical simulation three dimensional hydrodynamics lake taihu

Evidence from isotopic geochemistry as an indicator of eutrophication of Meiliang Bay in Lake Taihu, china

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第z1期49卷 62-71页

作者： LIN Lin, WU Jinglu & WANG Sumin nanjing institute of geography & limnology, chinese academy of sciences, nanjing 210008, china Graduate University of the chinese academy of sciences, Beijing 100039, china chinese Acad Sci Nanjing Inst Geog & Limnol Nanjing 210008 Peoples R China chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

In this paper, Lake Taihu, a large shallow freshwater lake in china, is chosen as an example of reconstruction of eutrophication through the comparison between stable isotopes from dissolved nutrients and plants and water column nutrient parameters and integration of multiple proxies in a sediment core from Meiliang Bay including TN, TP, TOC, C/N, δ15N, δ13C, etc. Differences in aquatic plant species and trophic status between East Taihu Bay and Meiliang Bay are indicated by their variations in δ13C and δ15N of aquatic plants and δ15N of NH4+. A significant influence ofexternal nutrient inputs on Meiliang Bay is reflected in temporal changes in δ 15N of NH4+ and hydro-environmental parameters. The synchronous change between δ13C and δ15N values of sedimented organic matter (OM) has been attributed to elevated primary production at the beginning of eutrophication between 1950 and 1990, then recent inverse correlation between them has been caused by the uptake of 15N-enriched inorganic nitrogen by phytoplankton grown under eutrophication and subsequent OM decomposition and denitrification in surface sediments, indicating that the lake has suffered from progressive eutrophication since 1990. Based on the use of a combination of stable isotopes and elemental geochemistry, the eutrophication of Meiliang Bay in Lake Taihu could be better traced. These transitions of the lake eutrophication respectively occurring in the 1950s and 1990s have been suggested as a reflection of growing impacts of human activities, which is coincident with the instrumental data.

关键词： stable carbon isotope of OM, stable nitrogen isotope, eutrophication, Lake Taihu.

A STUDY ON EQUILIBRIUM COASTAL PROFILES OF THE CLOSE TIDAL FLAT—A Case Study of Fengxian Tidal Flat

在线全文

学校读者我要写书评

暂无评论

chinese Geographical Science 2002年第1期12卷 55-60页

作者： LI Heng peng, YANG Gui shan(nanjing institute of geography and limnology, the chinese academy of sciences, nanjing 210008, P.R. china) nanjing institute of geography and limnology the Chinese Academy of Sciences Nanjing 210008

The article analyses the temporal spatial changes of profiles by EOF (Empirical Orthogonal Function) analysis and DTM analysis of GIS. These profiles, which are not affected by engineering, are chosen from the coast with successive field monitoring data from 1990 to 1999. Temporal and spatial EOF indicates the obvious stability of coast profile parameters in Fengxian tidal flat. In spatial scale, high tidal flats and deep water terraces are in a balance state while upper clino with steep slopes are sensitive and the stability is easy to be destroyed. In temporal scale, the erosion and deposition in this area are kept in balance in a whole. There are almost no change below 8- 9.5m. At the same time, it is the lower limit of tidal affection and the erosion and deposition process from it to high tidal flat keep in balance for many years. So the closure depth is appointed to from 8m to 9.5 m (Wusong datum mark).

关键词： silted tidal flat EOF analysis equilibrium profile spatial analysis

Experimental study on phosphorus release from sediments of shallow lake in wave flume

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第z1期49卷 92-101页

作者： SUN Xiaojing,ZHU Guangwei, LUO Liancong & QIN Boqiang nanjing institute of geography & limnology, chinese academy of sciences, nanjing 210008, china Graduate School of chinese academy of sciences, Beijing 100039, china 1. nanjing institute of geography & limnology Chinese Academy of Sciences Nanjing 210008 China2. Graduate School of Chinese Academy of Sciences Beijing 100039 China

Influence of wave on sediment resuspension and nutrients release from sediments, collected from Lake Taihu and Lake Chaohu, was studied in flume experiments. Under strong-wave conditions, concentrations of suspended solids (SS), total phosphorus (TP) and dissolved total phosphorus (DTP) in overlying water were increased significantly following the sediments re-suspension. During the experiments on sediments of Lake Taihu and Lake Chaohu, TP concentrations increased 6 times and 3 times, and DTP concentration increased 100% and 70% more than it in presuspension, respectively. Concentration of soluble reactive phosphorus (SRP) of experiment on sediment of Lake Taihu increased 25%. During the massive sediment suspension, the dissolved phosphorus in pore water and much of the phosphorus adsorbed by the sediment particles were released into overlying water. The phenomena in this wave flume experiment are quite similar to the situation observed in situ of Lake Taihu. The critical wave stresses of sediment re-suspension are nearly equal. The change of concentrations of SS, TP, and SRP was the same as that in situ *** study showed that concentrations of TP and SRP in lake water could be increased significantly by wave disturbance. Phosphorus release was significantly enhanced by wave disturbance at the beginning of massive sediment re-suspension, but decreased later.

关键词： shallow lakes, wave disturbance, internal release, phosphorus, wave flume experiment.

Alkaline phosphatase activity and the phosphorus mineralization rate of Lake Taihu

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第z1期49卷 176-185页

作者： GAO Guang, ZHU Guangwei, QIN Boqiang, CHEN Jun & WANG Ke nanjing institute of geography & limnology, chinese academy of sciences, nanjing 210008, china Hohai University, nanjing 210098, china chinese Acad Sci Nanjing Inst Geog & Limnol Nanjing 210008 Peoples R China Hohai Univ Nanjing 210098 Peoples R China

The phosphorus fractions, the alkaline phosphatase activity (APA) and other water chemical parameters were concomitantly monitored from April 2003 to October 2004 in different ecotype sites of Lake Taihu. During the stages of algae growth, the phosphorus fractions and their relationships with APA in different ecotype sites were discussed and the phosphorus mineralization rate was calculated. In the water of Lake Taihu, most of the phosphorus (70.2%) could be attributed to the suspended particulate phosphorus, while the dissolved reactive phosphorus (DRP) seems to contribute less than 7%. About 58% of the total phosphorus, however, can be hydrolyzed as inorganic phosphate to compensate for phosphorus deficiency of algae and bacteria growth. During the different algae growth stages, the APA and its Kinetic parameters were varied significantly between different ecotype sites of Lake Taihu. This trend is also visible by comparing the phosphorus mineralization rate,and the most rapidly phosphorus turnover time is only several minutes. The fast recycle of phosphorus can, to some extent, be explained that the phosphorus source of algal blooms. The phytoplankton seems to compensate for phosphorus deficiency by using the alkaline phosphatase to hydrolyze phosphomonoesters.

关键词： Lake Taihu, alkaline phosphatase, kinetic parameters, phosphorus, mineralization rate.