大长江三角洲地区区域旅游整合模式探究

区域旅游是现代旅游业发展的必然产物,也代表未来旅游业的发展趋势。区域旅游资源及产品整合能够有利于旅游业的快速发展。大长江三角洲地区区域旅游资源丰富,旅游产品多样,由于该区缺乏统一的旅游资源及产品整合,使得该区旅游业的发展受到制约。本文通过对该区旅游资源及产品的丰富性和多样性进行评述及其整合的可行性分析。提出了区域旅游整合模式的对策,以便能促进旅游业的快速发展。     

磷素水平对水稻幼苗生长发育的影响

以4种不同基因型水稻为材料,研究磷素水平对水稻幼苗的生物学和营养学性状的影响.结果表明:低磷处理对水稻幼苗各生物学性状影响很大,低磷条件下水稻幼苗株高、鲜重、干重均低于对照处理,根长伸长,根冠比增大;供磷过量处理水稻幼苗株高和干重低于对照.四种水稻幼苗相比,高优35的磷素利用效率明显低于其它三个品种.     

Daily variation of carbon flux in soils of Populus euphratica forests in the middle and lower reaches of the Tarim River

In order to lucubrate the daily variation of respiration in soils of Populus euphratica forests and analyze its relationship with environmental factors in the middle and lower reaches of the Tarim River, the LI-8100 instrument of soil CO2 flux system was used to measure the parameters of soil carbon flux and air temperature 10 cm above ground surface along the profiles of Usyman, Archy River, Yengisu and Karday, and the relationships between the soil carbon flux and the soil moisture content were analyzed. The nonlinear regression analysis was carried out with the software SPSS13.0. We observed that: (1) soil respiration began to be restrained when the air temperature was up to 30℃ 10 cm above the ground surface; (2) the rates of soil respiration under the forests of Populus euphratica were significantly different at various moisture contents, the soil carbon flux was high along the Usyman profile,which has a high soil moisture content, and it was low along the profiles of Archy River, Yengisu and Karday, which has a low soil moisture content; (3) the exponential model can be used to explain the relationship between soil respiration and air temperature 10 cm above the ground surface. The average Q10 values along the profiles of Usyman, Archy River, Yengisu and Karday are 0.61, 0.16, 0.22 and 0.35 respectively, much lower than the average of the world; (4) there is a positive correlation between the soil carbon flux and the soil moisture content     

广西田东县那板铝土矿矿床地质特征及找矿前景

在总结广西田东县那板地区铝土矿床地质特征的基础上,对该区铝土矿的找矿前景进行了初步的分析。     

论《呼兰河传》叙述视角的迁移与渗透

《呼兰河传》随追忆情感的深浅,叙述视角不断迁移:全知视角——儿童视角——儿童视角 全知视角——儿童视角——全知视角 儿童视角——追忆者视角,形成画面或歌谣的凝固;文本展开中叙述视角相互渗透:追忆者视角渗入全知视角、儿童视角,儿童视角渗入全知视角,使文本散文化、歌谣化。     

Dating and genesis of the upper Weihe River terraces in Longxi basin,China

Seven terraces along the Weihe River in Longxi basin have been investigated. These terraces all consist of archetypal duality in structure, namely the floodplain deposits and the layer of gravels overlaid by varying thickness of the loess. By resorting to various dating approaches such as palaeomagnetic, optically stimulated luminescenece (OSL), 14C and loess-paleosol sequence, we provide preliminary timing of these seven terraces along upper Weihe River. Analysis on sedimentation characteristics and dating of these terraces showed that seven terraces may be jointly generated by tectonic uplifts and climatic changes. Tectonic uplifts may accommodate initial river incision, and climatic change may be responsible for processes of subsequent channel widening and aggradation. Aggradation normally occurs during glacial periods, in contrast to down-cuttings during transitions from glacial to interglacial period. Moreover, on the basis of the timings and heights of these terraces, we infer that the long-term rate of river incision was determined to be 0.2 m/kyr during the last 870 kyr, which differs from other river incision rates. This discrepancy may reflect spatio-temporal differentiation of tectonic activities in the Qinling orogenic belt during the Pleistocene.     

闽江河口湿地景观格局动态及其驱动力

利用1986年、1996年和2003年遥感影像作为基本信息源，在遥感和GIS技术的支持下，运用景观生态学原理，选取景观格局指数，分析和研究1986-2003年闽江河口湿地景观格局的动态变化及其驱动力.研究结果表明，随着人为活动强度的逐渐增强，自然湿地景观的斑块数随时间而增加,而斑块面积减少，人工湿地和非湿地景观的斑块数和面积均有不同程度的增加,湿地景观向人工景观、非湿地景观转变的趋势明显；各类景观的斑块密度、斑块分维数和形状指数增大，景观形状趋于复杂；景观多样性指数和均匀度指数增大，优势度下降，景观破碎程度增强；泥沙运动、城市建设、防洪堤建造和采砂活动等是闽江河口湿地演变的主要驱动力.     

地表水体中藻类、底栖动物和微生物分布的空间演化及其对流域生态水文格局的响应——以辽河中下游流域为例

通过1996－2000年对辽河中下游流域地表水体25个断面的连续监测，采用“分布重心”模型，研究了地表水体中藻类、底栖动物和微生物分布的空间演化特征。结果表明，辽河中下游地表水体尤其是浑河河水的生物污染较为严重；藻类和细菌分布中心的位置均有向西北方向发生迁移的趋势，大肠杆菌分布中心的位置有向西南方向迁移的趋势，底栖动物的分布中心的位置有向东北发生迁移的趋势，同时，总体平均分布中心的位置有向西北方向迁移的趋势。以1999年为例，通过与林地、耕地、化肥、日照、气温、降雨、径流等生态水文因子的相关分析，结果表明，辽河中下游流域地表水体中藻类、底栖动物和微生物的空间分布特征与流域生态水文格局有较好的响应关系。     

基于802.11的无线局域网及其设计探讨

无线局域网是通过无线电波传播，在ＩＳＭ的２．４ＧＨｚ或５ＧＨｚ频段上工作，无线局域网的设计主要包括以下内容：拓扑结构的选择、无线链路的考察、无线网络组件的确定、产品的选择、无线覆盖区域及适宜的ＡＰ位置确定、无线信道的分配等．     

长江口北槽水域的Delaunay三角剖分

为了进行长江口水动力过程等的有限元数据模拟，研究了任意平面区域的Delaunay三角剖分和基于背景网格等值线点集的新的自动生成方法：局部三角形内得到等值线、进行自动加点；改进任意平面区域的Delauay三角剖分法，与行波法结合，从区域边界向域内逐步三角化，前者简化了自动加点算法，保证新生成点均位于域内、疏密连续变化和最终网格具有良好形态，后者则统一解决了多连通、4点共圆和非凸域的自动三角剖分问题，逐步减少人为给定边界的影响，从而减少了算法的运行时间，据此开发的软件包可动态监控点，网格的生成过程，并经大量的测试、验证，应用于长江口北槽水域的自动加点和三角剖分，取得了较好的效果。