旅游建构城市群“乡土—生态”空间的理论框架及研究展望   总被引：3，自引：0，他引：3  

陆林  任以胜  徐雨晨 《地理学报》2019,74(6):1267-1278

城市群“乡土—生态”空间是国土空间的重要组成部分和城市群空间的有机组成部分,是城市群优化城乡空间结构、维持传统人文活动、传承地域历史文化、维系生态系统健康的战略空间。关注旅游建构城市群“乡土—生态”空间的过程、格局和机制对满足国家战略需求和旅游地理学科建设具有重要意义。系统梳理城市群空间、旅游发展影响、城市群“乡土—生态”空间基本属性等研究领域的相关成果,发现已有研究对城市群内部及周边的边缘地带关注不足,有待进一步探索和诠释新的功能地域空间;对旅游显著影响中国经济社会空间的事实关注不够,有待进一步强化旅游助推中国现代化经济体系建设、生态文明建设、优秀传统文化传承创新的典型“空间性”研究;对城市群“乡土—生态”空间的利用方式关注较少,有待进一步开展城乡空间利用和城乡关系演变研究。研究认为,以旅游作为新的产业路径、新的利用方式科学引导主体功能区规划落地,推动城市群“乡土—生态”空间转型升级,发挥旅游在城市群空间结构优化和城市群可持续发展过程中的作用是探索国土整治与国土空间优化中国特色道路的重要举措。在构建旅游建构城市群“乡土—生态”空间的“三阶段”理论假说的基础上,指出未来应该重点开展的研究内容：遵循“过程—格局—机制—效应”的研究路线,探讨旅游建构城市群“乡土—生态”空间的实践路径,提出旅游建构城市群“乡土—生态”空间的政策保障体系研究的技术路径,探索旅游建构城市群“乡土—生态”空间在不同尺度空间上的一般特征和规律。  相似文献   

地铁变形监测中曲线拟合与自回归模型的综合应用   总被引：3，自引：0，他引：3  

朱海国  尹晖  陈雪丰 《测绘与空间地理信息》2006,29(6):89-91

曲线拟合与自回归是变形监测数据分析的常用方法。本文首先给出曲线拟合和自回归模型的模型形式以及模型正确性的检验方法,然后结合广州某地铁的部分实际监测资料,综合使用两种模型进行变形曲线的拟合与分析,结果表明:该综合模型对变形数据的处理有着显著的优越性。  相似文献   

Particulate organic matter and ballast fluxes measured using time-series and settling velocity sediment traps in the northwestern Mediterranean Sea     

Cindy Lee  Michael L. Peterson  Stuart G. Wakeham  Robert A. Armstrong  J. Kirk Cochran  Juan Carlos Miquel  Scott W. Fowler  David Hirschberg  Aaron Beck  Jianhong Xue 《Deep Sea Research Part II: Topical Studies in Oceanography》2009,56(18):1420-1436

Prompted by recent data analyses suggesting that the flux of particulate organic carbon sinking into deep waters is determined by fluxes of mineral ballasts, we undertook a study of the relationships among organic matter (OM), calcium carbonate, opal, lithogenic material, and excess aluminum fluxes as part of the MedFlux project. We measured fluxes of particulate components during Spring and Summer of 2003, and Spring of 2005, using a swimmer-excluding sediment trap design capable of measuring fluxes both in a time-series (TS) mode and in a configuration for obtaining particle settling velocity (SV) profiles. On the basis of these studies, we suggest that distinct OM–ballast associations observed in particles sinking at a depth of 200 m imply that the mechanistic basis of the organic matter–ballast association is set in the upper water column above the Twilight Zone, and that the importance of different ballast types follows the seasonal succession of phytoplankton. As in other studies, carbonate appears to enhance the flux of organic matter over opal. Particles must be at least half organic matter before their settling velocity is affected by ballast concentration. This lack of change in ballast composition with SV in particles with <40% OM content suggests that particle SV reaches a maximum because of the increasing importance of inertial drag. Relative amounts of OM and opal decrease with depth due to decomposition and dissolution; carbonates and lithogenic material contribute about the same amount to total mass, or increase slightly, throughout the water column. The high proportion of excess Al cannot be explained by its incorporation into diatom opal or reverse weathering, so Al is most likely adsorbed to particulate oxides. On shorter time scales, dust appears to increase particle flux through its role in aggregation rather than by nutrient inputs enhancing productivity. We suggest that the role of dust as a catalyst in particle formation may be a central mechanism in flux formation in this region, particularly when zooplankton fecal pellet production is low.  相似文献   

调和分析法应用于编制地壳垂直运动速率面等值线图的可靠性讨论     

范一中 《大地测量与地球动力学》2000,20(1):86-88

对有关文献提出的“地壳垂直运动调和分析”模型的建立过程作了全面分析 ,指出 :该模型建立过程中所做的一些处理是不合理的 ,由此建立的模型不是地壳垂直运动规律的客观反映 ,因而尚不足以成为编制地壳垂直运动速率面等值线图的可靠手段。  相似文献