巢湖流域地形起伏度及其与人口分布的相关性研究

地形起伏度描述了某一范围内地形的起伏状况,是影响人口分布的重要因子之一。以Arcgis 10.0为数据处理平台,以分辨率为90 m×90 m的SRTM DEM为基础数据,采用邻域统计分析法,提取了巢湖流域不同分析窗口下的地形起伏度;然后运用均值变点法确定巢湖流域的最佳分析窗口,分析了巢湖流域最佳分析窗口下的地形起伏度的分布特点;并探讨了地形起伏度与人口分布的相关性。结果表明:1以90 m×90 m的SRTM DEM为基础数据下的巢湖流域地形起伏度的最佳分析窗口为11×11窗口单元;2巢湖流域地形起伏度介于0"701之间,整体趋势为以平坦为主,西高东低、南高北低,中部巢湖区域较低;3巢湖流域地形起伏度与人口密度呈显著负相关,其幂数拟合曲线拟合度为0.682。     

巢湖地区侵入岩锆石定年

安徽巢北地区坐落着一个"M"型的山脉,近年来对该地区的构造、地层和古生物化石已有很多的研究积累,但对于岩浆岩,由于分布和发育有限而研究程度较低。文章应用LA-ICP-MS锆石微区分析技术对该地区出露的岩体进行了精确定年。结果显示,岩体中含大量岩浆成因锆石,以高的w(Th)/w(U)比和振荡结晶环带为特征。样品中16个测点的n(206Pb)/n(238 U)加权平均年龄为(100.8±1.3)Ma,代表该岩体的形成年龄。巢北地区位于下扬子北缘,近年来关于下扬子地区中生代岩浆岩研究的年龄数据尚无小于100 Ma的报道,而在本区西侧紧邻的郯庐断裂带南缘上,其岩浆岩的形成时代介于132~103 Ma之间。因此,巢北地区侵入岩在时代和成因上,和郯庐断裂带的联系更加密切。     

试述对巢湖旅游电子商务应用的探讨

巢湖作为国家旅游度假区,它的旅游资源的开发、生态旅游的发展等问题已经有不少的学者作过了详细的探讨,但对于巢湖的旅游在电子商务方面的应用却涉及甚少,本文通过说明旅游电子商务是旅游行业发展的方向,并以巢湖旅游电子商务为研究对象,分析了巢湖旅游电子商务的应用现状及其存在的问题,并针对这些问题提出相应的解决方案,以促进巢湖旅游电子商务又好又快地发展,为当地的经济作出应有的贡献.     

巢湖城市内河沉积物不同形态磷空间分布特征

对巢湖市城市内河的表层沉积物及柱状沉积物进行了采样,并采用修正后的标准测试程序( SMT)测定了其中的总磷(TP)、无机磷(IP)、有机磷(OP)、铁/铝磷(Fe/Al-P)和钙磷(Ca-P),分析了各形态磷之间以及与沉积物有机质之间的相关性.结果表明,表层沉积物TP的质量分数在832.09～2 572.41 mg·kg-1之间,其中以Fe/Al-P为主,占总磷的比例为42.0％～62.3％.采样点各形态磷随深度的增加总体呈现先升高后下降的趋势,但不同采样点出现峰值的深度有所不同,这种空间分布特征能够较好反映周边环境现状和入河污染负荷的变化.不同深度沉积物中各形态磷之间存在极显著的相关性(概率水平P＜0.01),各形态磷与有机质也存在极其显著的正相关.     

巢湖沉积物总磷分布及其地质成因

以巢湖为研究对象,分析研究了巢湖沉积物总磷含量的水平、垂直分布.结果表明:巢湖北部河流入湖口处沉积物中总磷含量高于其他的河流入湖口处,原因是发源于北部地区的水系带来大量的磷质,丰富了巢湖中磷的来源.柘皋河和兆河沉积物总磷的垂直分布存在变化程度的差异,主要与柘皋河补给来源于含磷地层区有关.     

巢湖地区构造应力场研究及动力分析

对巢湖地区地质构造的展布规律进行了分析和研究.通过大量的观测资料,利用各种地质构造形变痕迹反推变形作用时期的古应力场方向.在此基础上,对该地区的构造形成机制及其动力学背景进行分析,提出了不同地质时期动力学机制.     

On the horizontal distribution of algal-bloom in Chaohu Lake and its formation process

Based on the remote sensing images of algae, the present work analyzes the horizontal distribution characteristics of algal blooms in Chaohu Lake, China, which also reveals the frequency of algal blooms under different wind directions. Further, an unstructured-grid, three-dimensional finite-volume coastal ocean model （FVCOM） is applied to investigate the wind-induced currents and the transport pro- cess to explain the reason why algal blooms occur at the detected places. We first deduce the primary distribution of biomass from overlaid satellite images, and explain the formation mechanism by analyzing the pollution sources, and simulating the flow field and transportation process under prevailing wind over Chaohu Lake. And then, we consider the adjustment action of the wind on the corresponding day and develop a two-time scale approach to describe the whole formation process of algae horizontal distribution in Chaohu Lake. That is, on the longer time scale, i.e., during bloom season, prevailing wind determines the primary distribution of biomass by inducing the characteristic flow field; on the shorter time scale, i.e., on the day when bloom occurs, the wind force adjusts the primary distribution of biomass to form the final distribution of algal bloom.     

巢湖市农村体育场地设施现状及发展困境分析

采用文献资料法、问卷调查法、田野调查法、数理统计法等研究方法,对巢湖市农村体育场地设施的现状以及发展困境进行调查研究,研究结果显示:巢湖市农村体育场地数量为9.28个/万人,人均体育场地面积0.86 m2,以老年人和青少年使用为主,成年男性使用率较低,农村体育场地规模与人口规模分布不对应,规模种类单一,教育系统和其他系统中体育场地设施资源利用率较低等.城乡二元制社会结构的制约、农村体育场地设施管理机制不健全、忽视农村老年人公共体育场地设施建设,是导致巢湖市农村体育场地设施建设落后的重要因素.在此基础上提出,打破行政壁垒,进行统一的场地体育设施规划建设;加强对体育场地设施使用和体育健身技能培训引导;完善农村公共体育场地设施购买和维护的管理制度;加强社会力量,增加其他体育场地设施资源的利用等建设性建议.为政府及有关体育部门在新农村建设,完善巢湖市农村基本公共体育场地设施空间布局提供现实素材.     

Spatio-temperial variations of the bacterioplankton community composition in Chaohu Lake, China

Despite considerable attention paid to Chaohu Lake in China, the dynamics of bacterioplankton community composition （BCC） on spatial and seasonal scales are poorly understood. In this study, water samples were collected from autumn 2006 to summer 2007 at five positions in Chaohu Lake with different trophic status. BCC of these samples was determined by both the PCR amplification of the 16S rDNA gene and the denaturing gradient gel electrophoresis （DGGE）. The abundance and diversity of bacterioplankton communities at different sampling positions showed similar seasonal patterns. The BCCs in the samples varied substantially, and the pattern of changes indicated that the seasonal difference might have a significant impact on the BCC＇s structure in the lake. Canonical correspondence analysis （CCA） on the DGGE patterns and physicochemical parameters indicated that the temperature and the levels of 5-d biochemical 02 demand （BODs）, NH3-N, CODMn, total nitrogen, total phosphorous, and dissolved oxygen significantly influenced the BCC, and four of the seven variables were related to the level of eutrophication. Our results indicate that eutrophic status and season are the most influ- ential factors in determining BCC in Chaohu Lake.     

Environmental changes during early-middle Holocene from the sediment record of the Chaohu Lake,Anhui Province

A typical lake sediment core is obtained from the Chaohu Lake in the lower reaches of the Yangtze River,Anhui Province,China.The timing scale is constrained by AMS 14 C dating method.Climate proxies such as pollen and grain size in the core are analyzed to reconstruct the environment changes at this site approximately between 9870 and 2170 cal.a BP.The results indicate that at the research area, the climate in the early-middle Holocene had evolved through 3 stages.From 9870 to 6040 cal.a BP, proxy records show a warm and dry climate with low water levels after the late-glacial period.During this stage,cool and dry events occurred at about 8910 and 6060-6030 cal.a BP.Then,between 6040 and 4860 cal.a BP,the climate was humid and vegetation was more flourishing in the Chaohu Lake Valley.The Holocene Optimum occurred at 5840-5500 cal.a BP in the Chaohu Lake,showing the best condition of water and heat.Elm Decline occurred at the period of 5380-4930 cal.a BP.Since 4860 cal.a BP,the climate was warm and dry through 2170 cal.a BP as shown in both pollen spectrum and grain-size histories.Two obvious dry events occurred in 3760 and 2170 cal.a BP,respectively.At 2170 cal.a BP,the water level of the Chaohu Lake reached the lowest as the lakebed possibly exposed. Such lake sediment observations are consistent with the historical records in this area.