“THE END OF MODERN HISTORY”?*     

MICHAEL WILLIAMS 《Geographical review》1998,88(2):275-300

ABSTRACT. The first half of the twentieth century marked both an end to confidence in human control of the earth and a prelude to the contemporary era of intense environmental concern after 1950. This conspectus of the environmental history/historical geography of the transitional years between 1900 and 1950 focuses on rising concerns over resource supplies and exploitation, particularly land settlement, timber supplies, soil erosion, and river-basin control. Conservation and the pervasiveness of ecological thinking and analogy form a strong underlying theme.  相似文献   

韶关市旅游业发展前景初探   总被引：1，自引：0，他引：1  

程玉鸿  张俊军 《地域研究与开发》1998,(Z1)

通过分析韶关市旅游业的发展现状及存在问题,结合城市旅游业发展条件的论述,探讨了韶关市旅游业发展前景,提出了市域旅游业应贯彻以市场为导向,实施“内筹外引,重点突出,综合配套,持续发展”的发展战略  相似文献   

南沙群岛开发区划初步研究   总被引：2，自引：2，他引：0  

赵焕庭 《热带地理》1998,18(3):221-226

概述了南沙群岛的主权,区位,自然环境与资源条件,指出南沙群岛区域发展在中国建设中的作用,进一步讨论了南沙群岛开发问题,提出了南沙群岛开发区划方案,划分出３个开发区;Ｉ西部和南部大陆架上大陆坡海石油天然气和拖网渔业资源开发区,ＩＩ北部岛礁海珍品,海洋动力能源和热带陆地资源开发区,Ⅲ北部深海大洋性延绳钓渔业资源开发区。  相似文献   

安徽省山地旅游资源定量评价与开发   总被引：4，自引：1，他引：3  

万绪才  丁登山  汤家法 《山地学报》1998,(4)

在大量调查数据的基础上,运用定量方法对安徽山地旅游资源进行评价分析,并将其山地风景名胜区划为三个等级,最后提出该省山地旅游资源的开发设想．  相似文献   

图们江地区水环境容量及其对区域开发的影响研究   总被引：10，自引：1，他引：9  

田卫  俞穆清 《地理科学》1998,18(2):169-175

以ＣＯＤ为控制指标,计算了图们江地区５条河流逐月环境容量以及污水达标排放时的允许污水排放量。结果表明,各月环境容量分配极不均匀,丰水期２个月约占５０％,而长达５个月的枯水期环境容量很小,不足全年的１０％;即使以１９９５年污水排放量衡量,污水达标排放时,枯水期图们江干流等５条河流控制断面水质也达不到指定功能水质标准,已无环境容量可利用。因此,河流水环境容量已成为制约图们江地区开发的主要因素,为了确保  相似文献   

青岛市黄岛区潮河水源地地下水数值模拟     

付佳妮  孙建明  林青 《山东国土资源》2015,31(7)

在分析研究青岛市黄岛区潮河流域水文地质条件基础上,建立了水文地质概念模型和地下水流数值模拟模型,利用地下水水位动态监测资料对模型进行了识别,并预测了三枯一丰一平条件下地下水最大开采量以及水位、降深分布情况。结果表明,模型验证拟合结果较好,地下水最大开采量为2.4万m3/d,地下水开采不会引起地面沉降、海水入侵等问题。  相似文献   

洛阳地区太阳能资源分析与评估   总被引：1，自引：0，他引：1  

朱学玲  李红卫 《气象与环境科学》2015,38(1):67-72

根据1981—2010年郑州辐射站太阳辐射和日照资料、洛阳地区9个气象观测站日照资料,采用气候学计算、线性趋势分析等方法和资源丰富程度、利用价值、稳定程度等指标,对洛阳地区太阳能资源进行了计算、分析和评估。结果表明:洛阳地区多年平均总辐射为4842.4MJ·m-2·a-1,总体呈显著减少趋势,减少速率为每年1.4MJ·m-2。夏季辐射丰富,冬季偏少,夏季总辐射量是冬季的2倍;月平均总辐射5月最多(569.7MJ·m-2),12月最少(241.9MJ·m-2);年总辐射孟津最高,为4922.8MJ·m-2·a-1,宜阳最少,为4681.1MJ·m-2·a-1。多年平均日照时数为2064.7h,总体呈显著减少趋势。春季日照时数多,冬季少,春季日照时数比冬季多33.37%;月平均日照时数5月最多(217.3h),2月最少(138.2h);年日照时数孟津最多(2144.9h),宜阳最少(1909.2h)。洛阳各地属太阳能资源丰富区,利用价值较高,各月日照时数6h的天数为9.8~18.1天,全年为162.7~185.3天;太阳能资源也比较稳定,月最大日照时数12月6h的天数为16.9天,是月最小日照时数7月的1.48倍,12月至次年1月不利于太阳能利用。  相似文献   

论四川盆地地下卤水资源开发利用的现状及对策   总被引：10，自引：2，他引：10  

杨立中 《四川地质学报》1992,(3)

四川盆地地下卤水资源储量大,卤水浓度较高,并含有I、Br、K、Li等多种有用组分。地下卤水多沿构造隆起部位富集,并具有天然气和卤水同层的特点。指出目前对地下卤水开发利用发展不均的现状,以及多以制盐为主,开发利用单一等现象。提出深化对地下卤水资源量的评价,加强对地下卤水综合利用的研究,组成跨行业的开发实体等建议。  相似文献   

Risks of shifting baselines highlighted by anecdotal accounts of New Zealand's snapper (Pagrus auratus) fishery     

Darren M. Parsons  Mark A. Morrison  Alison B. MacDiarmid  Bruce Stirling  Phillip Cleaver  Ian W.G. Smith 《新西兰海洋与淡水研究杂志》2013,47(4):965-983

Anecdotal data sources may constitute an important component of the information available about an exploited species, as record keeping may not have occurred until after exploitation began. Here, we aimed to fill any gaps in the exploitative history of the sparid snapper (Pagrus auratus), using social and historical research methods. Social research consisted of interviews with recreational fishers, focusing on the most and largest snapper they had caught. In addition, the diary‐logs of two recreational fishers were analysed. Historical research consisted of investigation of old books, photos, archives and unpublished sources unconventional to fishery science. Interviews with fishers demonstrated no or weak trends in snapper abundance or size, and were likely impeded by a lack of ability to detect change in a fish stock that may still be considered abundant. The fishers’ perception of change, however, largely reflected recent experiences (last c. 10 years), when biomass is understood to have increased, and mostly did not consider experiences before the 1980s. Alternatively, diary‐logs of fisher catch rates produced a pattern that matched formal stock assessments of snapper biomass, suggesting declines in abundance up until the 1990s and an increase in biomass after that time. Historical research, although more qualitative, had the ability to investigate periods where formal records were not kept and described a fishery vastly different from the current one. Snapper were easily caught, in great abundance and in unusual locations. Localised depletion of snapper was first noticed in the early 20th century, despite spectacular catches of snapper occurring after that time. Snapper behaviour was also likely different, with visual sightings of snapper by onlookers a common occurrence. Although predictions from stock assessment models are consistent with that of the anecdotes listed here (i.e., high biomass in the past), these anecdotes are valuable as they explain lost biomass in a perspective meaningful to all. This perspective may be valuable for managers trying to consider the non‐financial value of a shared fishery but, if unrecognised, represents a shifting baseline.  相似文献   

天然气水合物开发安全检测技术应用研究          下载免费PDF全文

汤凤林  蒋国盛  А.Я.Третьяк  В.Ф.Чихоткин 《探矿工程》2010,37(10):9-13

中国近年来先后在南海北部和祁连山南缘青海省天峻县永久冻土带中发现天然气水合物,这是一种新能源,它将对中国能源结构的调整和能源紧张的缓解起到非常重要的作用。但是,天然气水合物开采安全是个大问题,已经引起了国际上专家们的极大关注。俄罗斯南方国立技术大学地球物理、探矿工程和石油钻采教研室开发出来的天然气水合物开发安全检测技术和方法,可以准确确定出射孔部位的位置、检查射孔部位是否阻塞和如何解阻等关键技术,对天然气水合物开采安全提供了技术支撑,对此应该进行研究。  相似文献