旅游与环境资源关系研究进展     

郑芳  陈田  侯迎  季小妹  李飞 《地理科学进展》2010,29(6)

在旅游学与环境资源领域相关SSCI/SCI期刊论文的基础上,分析了目前旅游与环境资源关系的研究现状,总结了当前研究的重点与不足.在此基础上明确指出了未来的研究方向.对于4个主要研究主题,旅游环境资源价值评估的理论基础需要进一步完善,应加强多种评估方法的集成应用以及人文旅游资源价值评估实践.关于旅游可持续与生态旅游,研究方法总体上定量化不足,方法应用比较局限,且研究内容不够丰富.所以内容充实与多种方法运用及定量化研究是今后研究的突破点.关于旅游与环境资源耦合关系研究,研究内容相对分散,环境对旅游的作用是研究的薄弱点,今后需要在旅游研究中多加考虑环境的作用,再者旅游与气候关系研究没有得到重视,所以应该多加考虑旅游与气候关系研究.以适应全球气候变暖大背景.环境资源管理方面旅游税、环境税以及环境保证或生态保证的研究,也是今后的研究重点.此外,研究主题需要进一步拓宽,研究视角应实现多样化,全面考虑社会科学与自然科学的相关学科视角并注意多视角综合研究.  相似文献   

横断山区垂直带谱的分布模式与坡向效应   总被引：5，自引：1，他引：4  

姚永慧  张百平  韩芳  庞宇 《山地学报》2010,28(1)

根据收集到的横断山区山地垂直带谱数据,对山地垂直带的坡向效应和空间分布规律进行了分析和研究.结果表明:1)主要的垂直带和垂直带界线如林线、暗针叶林带、雪线等的纬度和经度地带性分布规律明显并且分布模式都相似,纬向上呈开口向下的二次曲线分布模式,经向上呈开口向上的二次曲线分布模式,两者共同形成"双曲抛物面"分布模式,充分反映了横断山区的环境与生态的复杂性和独特性,也进一步丰富和发展了山地垂直带谱的二次曲线假说; 2)横断山区山地垂直带谱表现出明显的基于水分驱动的坡向效应,主要表现为同一山体的东、西坡往往具有不同的基带和带谱结构,相同类型的带谱出现的海拔和分布范围不同,迎风坡表现出较为湿润的类型和带谱结构,而背风坡则表现出更为干旱的类型和组成结构;横断山区的坡向效应主要是由于山体对当地盛行季风的影响,造成迎风坡和背风坡水热条件相差很大,从而发育不同的山地垂直带谱类型.从横断山区山地垂直带谱的空间分布规律来看, 28°～29°N、98°～101°E范围内,即大致在澜沧江以东-雅砻江以西,山地垂直带谱普遍表现出干热的特点,为横断山区干热气候的核心地带.但如何定量分析山地的坡向效应尚有待于进一步的研究和讨论.此外、数据质量和数据误差也对分析的结果,尤其是空间分布模式的数学模拟结果产生一定的影响,在以后的研究中尚需进一步完善.  相似文献   

2008年7月5日长泰M_L4.7地震前流动地磁观测结果的分析     

许仪西  方韡  陈新泽  张永固  周昌贤  吴维日 《地震地磁观测与研究》2010,31(1):39-42

摘要利用2002年7月～2008年11月的流动地磁观测资料进行分析研究,结果表明:2007年4月福建南部的流磁观测结果出现异常,可能是福建长泰M_L4.7地震前的震磁效应;震前靠近北西向断裂,并沿该断裂走向分布的流磁测点同步出现异常,可能与断裂构造应力作用有关。  相似文献   

浙江青田石平川钾长花岗岩特征及其成因探讨     

叶泽富  鄢云飞  张彦杰  万方 《火山地质与矿产》2010,(2):87-92

青田县石平川钼矿床是浙江省现已发现的规模最大的钼矿床,多数人认为石平川钼矿床的形成与钾长花岗岩有密切关系。本文主要从岩相学、岩石地球化学、LA—ICPMS锆石U—Pb年代学等方面研究石平川钾长花岗岩,并探讨其成岩环境及成因。研究表明,石平川岩体属于高钾钙碱性、弱过铝质S型花岗岩,其形成于早自垩世晚期挤压环境,源岩物质主要是壳源,并有少部分幔源物质成分参与。  相似文献   

基于层次分析的辽宁地区震情指标预警模型研究   总被引：1，自引：0，他引：1  

曹凤娟  焦明若  王海燕  李芳  李海林 《华南地震》2010,30(2):88-96

根据辽宁及邻区地质构造与地震活动特点,结合1970年以来该区中强震震例,分辽南和辽蒙交界两个小区分别提炼了中强震预警判据。在此基础上,利用层次分析法,建立了辽宁地区基于时间尺度的地震震情指标预警模型。  相似文献   

用ETAS模型分析自贡矿井注水触发地震   总被引：1，自引：0，他引：1  

龙锋  杜方  阮祥  邓远清  张铁宝 《中国地震》2010,26(2)

为研究自贡地区矿井注水与地震活动性之间的关系,按地震活动规律将注水区ML1.2以上历史地震活动划分为3个阶段,采用POWELL法反演了各阶段ETAS模型参数。结果表明,不存在注水的第1、2阶段背景地震比例约40%～50%,单个地震序列中余震较少。而在注水的第3阶段,由地震自激产生的余震比例较高(93.1%),而背景地震仅占6.9%,比第1、2阶段都要少,这一结果与已有的认识相矛盾。为此,提出单位时间背景地震的发生率,即ETAS模型参数中的μ值,作为判断注水触发地震的依据。计算结果表明,与前两个阶段相比,第3阶段的确拥有最大的μ值,说明注水对该区地震触发有明显影响。  相似文献   

Accuracy assessment of global historical cropland datasets based on regional reconstructed historical data—A case study in Northeast China   总被引：7，自引：0，他引：7  

BeiBei Li  XiuQi Fang  Yu Ye  XueZhen Zhang 《中国科学:地球科学(英文版)》2010,53(11):1689-1699

Historical cropland datasets are fundamental for quantifying the effects of human land use activities on climatic change and the carbon cycle. Two representative global land-use datasets, the Global Land Use Database (termed SAGE dataset) and the Historical Database of the Global Environment (termed HYDE dataset) have been established and used widely. Despite improvement of data quality and methodologies for extracting historical land use information, certain dataset limitations exist that need to be quantified and communicated to users so that they can make informed decisions on whether and how these land-use products should be used. The Cropland data of Northeast China (CNEC) is based on calibrated historical data and a multi-sourced data conversion model, and reconstructs cropland cover change in Northeast China over the last 300 years. Using the CNEC as a reference, we evaluated the accuracy of cropland cover for SAGE and HYDE in Northeast China at spatial scales ranging from the entire Northeast China to provinces and even individual raster grid cells. Neither SAGE nor HYDE reflects real historical land reclamation. Cropland areas in SAGE are overestimated by 20.98 times in 1700 to 1.6 times in 1990. Although HYDE is better, there are significant disagreements in cropland area and distribution between HYDE and CNEC, especially in the 18th and 19th centuries. The proportion of total grid cells whose relative error was greater than 100% was 63.55% in 1700 and 53.27% in 1780. Global cropland dataset errors over Northeast China originate mainly from both the reverse calculation method for historical cropland data based on modern spatial patterns, and modern land-use outputs from satellite data.  相似文献   

Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea     

Li  Haiyan  Zhang  Shihong  Bai  Lingyan  Fang  Nianqiao 《中国海洋湖沼学报》2010,28(6):1350-1361

Detailed mineral magnetic measurements, integrated with grain-size distribution and X-ray diffraction (XRD) analyses, were made on the marine sediments of Core MD98-2172, retrieved from the Eastern Timor Sea. Values of magnetic susceptibility in this core drop sharply down-core from ∼3.85 m deep below sediment/water interface and are very low at ∼5.35 m. However, both XRD and grain-size distribution results show no sudden change in terrigenous input during sedimentation. Mineral magnetic results indicate that the depth of ∼3.85 m may be an oxic/anoxic boundary. Therefore, the sediments below ∼3.85 m have been subjected to intense reductive diagenesis, whereas the sediments above ∼3.85 m are seldom affected. The magnetic properties of the sediments shallower than 3.85 m are dominated by pseudo-single domain (PSD) magnetite, with little down-core variation in its content and grain size. Below ∼3.85 m, the magnetic mineral assemblages that have survived in the sediments may record different stages of the reductive diagenesis: (1) the sediments from the 3.85–5.35 m interval are at the stage of iron oxide reduction; PSD magnetite is the major magnetic contributor, but it becomes less abundant and coarser down-core; (2) the sediments below ∼5.35 m are at the stage of sulphate reduction; ferrimagnetic minerals almost vanish and paramagnetic minerals contribute to down-core susceptibility variations, including pyrite as evidenced by high-temperature magnetic susceptibility measurements. However, the susceptibility variations below ∼5.35 m of Core MD98-2172 show obvious periodicity, despite the intense effect of reductive diagenesis. Furthermore, the down-core susceptibility variations are coincident with fluctuations in the quantity of fine detrital particles (<8 μm), which may come mainly from the advection of the Indonesia Throughflow (ITF) and/or river input from Timor. Therefore, for Core MD98-2172, susceptibility variation below ∼5.35 m, which potentially correspond to fluctuations in the quantity of fine particles, may record the histories of the development of the ITF and precipitation on Timor.  相似文献   

Vegetation change of ecotone in west of Northeast China plain using time-series remote sensing data   总被引：3，自引：1，他引：2  

Fang Huang  Ping Wang 《中国地理科学(英文版)》2010,20(2):167-175

Multi-temporal series of satellite SPOT-VEGETATION normalized difference vegetation index (NDVI) and normalized difference water index (NDWI) data from 1998 to 2007 were used for analyzing vegetation change of the ecotone in the west of the Northeast China Plain. The yearly and monthly maximal values,anomalies and change rates of NDVI and NDWI were calculated to reveal the interannual and seasonal changes in vegetation cover and vegetation water content. Linear regression method was adopted to characterize the trends in vegetation change. The yearly maximal NDVI decreased from 0.41 in 1998 to 0.37 in 2007,implying the decreasing trend of vegetation activity. There was a significant decrease of maximal NDVI in spring and summer over the study period,while an increase trend was observed in autumn. The vegetation-improved regions and vegetation-degraded regions occupied 17.03% and 20.30% of the study area,respectively. The maximal NDWI over growing season dropped by 0.027 in 1998–2007,and about 15.15% of the study area showed a decreasing trend of water content. Vegetation water stress in autumn was better than that in spring. Vegetation cover and water content variations were sensitive to annual precipitation,autumn precipitation and summer temperature. The vegetation degradation trend in this ecotone might be induced by the warm-drying climate especially continuous spring and summer drought in the recent ten years.  相似文献   

Comprehensive measurement for carrying capacity of resources and environment of city clusters in central China   总被引：3，自引：0，他引：3  

Chuanglin Fang  Xiaoli Liu 《中国地理科学(英文版)》2010,20(3):281-288

Studying the carrying capacity of resources and environment of city clusters in the central China has impor-tant practical guidance significance for promoting the healthy,sustainable and stable development of this region.Ac-cording to their influencing factors and reciprocity mechanism,using system dynamics approaches,this paper built a SD model for measuring the carrying capacity of resources and environment of the city clusters in the central China,and through setting different development models,the comprehensive measurement analysis on the carrying capacity was carried out.The results show that the model of promoting socio-economic development under the protection of resources and environment is the optimal model for promoting the harmony development of resources,environment,society and economy in the city clusters.According to this model,the optimum population scale of the city clusters in2020 is 42.80×106 persons,and the moderate economic development scale is 22.055× 1012 yuan(RMB).In 1996-2020,the carrying capacity of resources and environment in the city clusters took on obvious phase-change characteristics.During the studied period,it is basically at the initial development stage,and will come through the development process from slow development to speedup development.  相似文献