气候地层中0.9Ma以来同位素亚段的再划分     

袁林旺  刘泽纯 《地层学杂志》2004,28(4):313-318

同位素段、亚段乃至次亚段的划分实质上是定义不同级别 (层次 )的气候事件 ,为全球不同级别气候事件的对比提供参照。但已有的研究可能受区域性因素及记录本身条件所限 ,对同位素亚段、次亚段划分的数目及对比不尽一致。基于太阳辐射曲线、柴达木盆地高分辨率自然伽玛 (GR)曲线及其他相关气候记录的对比研究发现 ,同位素亚段的划分与太阳辐射曲线岁差周期间存在着明确的对应关系 ,据此对 0 .9Ma以来同位素亚段划分进行补充和校正。基于气候层次的观点 ,建议以太阳辐射曲线为参照 ,对同位素亚段重新进行系统命名 ,在轨道尺度变化这一级取消次亚段 ,即完全按照太阳辐射曲线峰值进行亚段编号。  相似文献   

An Ensemble of Geostatistical Simulated Realizations Using a Clustering Algorithm to Reproduce Model-Based Statistics: Case Study of a Gravel Reserve at Kivalina,Alaska     

Snehamoy Chatterjee 《Marine Georesources & Geotechnology》2013,31(3):225-241

This paper demonstrates the convergence of model-based statistics from multiple simulated realizations. Theoretically, the convergence of realization statistics is guaranteed over the number of realizations that are independent among themselves. The rate at which realization-based statistics converges with model-based statistics is important and must be assessed. However, due to poor selection of the random number generator, the generated realization might be far from mutual independence. We use the k-means clustering algorithm to select nearly independent realizations from a set of realization models. We apply the proposed algorithm to a coastal erosion problem in Alaska to estimate the amount of gravel.  相似文献   

中国荔波锥状喀斯特世界自然遗产价值全球对比分析   总被引：1，自引：0，他引：1  

陈品冬  熊康宁  肖时珍 《地理研究》2013,32(8):1517-1527

研究世界自然遗产地价值,对遗产地本身以及其他类似区域的可持续发展有重要意义。基于系统论思想,将"中国南方喀斯特"第一批三处遗产地中的荔波锥状喀斯特置于全球视角,选取相似的、具有代表性的区域,结合世界遗产第八条有关地质地貌特征与演化历史等方面的评价标准,进行全球对比分析,揭示其全球显著价值。研究表明:荔波锥状喀斯特具有更为独特的演化环境与更为复杂的地质演化过程;更有典型的锥状喀斯特单体形态与较为齐全的地貌组合类型,更有罕见的锥状喀斯特森林生态系统和生命记录。荔波锥状喀斯特是反映地球热带-亚热带锥状喀斯特演化历史主要阶段的典型范例,极具代表中国南方喀斯特的世界遗产价值。  相似文献   

福田红树林保护区科普教育模式探讨   总被引：2，自引：2，他引：0  

徐华林  王淼强  吴苑玲  钟瑾芳 《湿地科学与管理》2008,4(1):52-55

福田红树林保护区位于深圳湾东北岸,其独特的红树林湿地景观吸引了大量市民及游客前来参观。科普宣传教育是保护区的重要职能之一,保护区管理局应强化服务意识,充分发挥保护区的科普教育资源优势,以满足市民群众的科普知识需求。本文总结了保护区近年来开展科普教育活动的经验教训,分析了当前科普教育模式优点和不足,对今后科普教育模式提出了建议。  相似文献   

重庆金佛山自然保护区内外地下水化学特征对比研究   总被引：1，自引：1，他引：0  

王鹏  沈立成  伍坤宇  肖琼  周小萍  杨平恒 《中国岩溶》2012,31(2):165-172

利用重庆金佛山自然保护区22个地下水排泄点2005-2009年的水化学监测数据,对比了保护区内、外水化学特征差异及影响因素。结果表明:保护区外地下水的pH值较保护区内的要低,但电导率则较高;自然保护区外地下水的Ca2+、Mg2+、Na+、K+、Cl-、NO-3、SO42-、HCO3-浓度中值比自然保护区内的分别高27.78mg/L、3.23mg/L、3.47mg/L、0.97mg/L、2.38mg/L、9.29mg/L、15.06mg/L、42.03mg/L;保护区内白云岩地下水的Mg2+/Ca2+(摩尔比)为0.76~1.33,明显比保护区外灰岩、碎屑岩区的高,但保护区外灰岩地下水的Mg2+/Ca2+(摩尔比)较保护区内灰岩区的更高。岩溶地下水系统地球化学的敏感性以Ca2+、HCO3-、NO3-较为敏感,保护区内地下水的平均敏感指数(GSI)GSICa2+为0.097,GSIHCO3-为0.125,GSINO3-为0.008;保护区外地下水的GSICa2+为0.415,GSIHCO3-为0.334,GSINO3-为0.648。护区内所有取样点水质均为I或Ⅱ类;而保护区外地下水因受农业施肥、工业生活污水影响,1、16、19号泉的NO3-浓度偏高,为Ⅴ类,其余为Ⅲ类。总体上,保护区内水质明显优于保护区外,可见设立自然保护区对于保护岩溶水具有积极意义。   相似文献   

Retreating to nature: rethinking 'therapeutic landscapes'     

Jennifer Lea 《Area》2008,40(1):90-98

There is a long history of removing oneself from 'society' in order to recuperate or repair. This paper considers a yoga and massage retreat in Southern Spain, and what opportunities this retreat experience might offer for recuperation and the creation of healthy bodies. The paper positions 'nature' as an active participant, and as 'enrolled' in the experiences of the retreat as a 'therapeutic landscape', and questions how and what particular aspects of yoga practice (in intimate relation with place) give rise to therapeutic experiences.  相似文献   

The nature of post-neoliberalism: Building bio-socialism in the Ecuadorian Amazon     

《Geoforum》2017

This paper explores the ideology and materiality of ‘bio-socialism’, through which the Ecuadorian government is attempting to catalyse a ‘post-neoliberal’ transition from the ‘finite resources’ of Amazonian oil reserves to the ‘infinite resources’ of biodiversity and scientific knowledge. This experiment is embodied in Ikiam, a public university under construction in the Ecuadorian Amazon. Drawing on extensive field research, we argue that, despite its radical intentions, bio-socialism is functioning as a strategy for the real subsumption of nature to capital, which is being operationalized in Ikiam in ways that reproduce the neoliberal knowledge economy. However, the contradictions of this process imply that, in practice, Ikiam is only intensifying established patterns of the formal subsumption of nature, by commodifying the genetic wealth and indigenous knowledge of the Amazon, and legitimating the expansion of the oil and mineral frontiers. The case of bio-socialism demonstrates the paradoxical nature of actually-existing post-neoliberalism, and illustrates the tendency for utopian ideologies to reproduce the material conditions they are seeking to escape.  相似文献   

The geological heritages in Xinjiang, China: Its features and protection     

HUANG Song 《地理学报》2010,20(3):357-374

The geological heritage protection and its development at home and abroad reflect the progress in the aspect from the single protection to the coordination between protection and exploitation. The geopark established by UNESCO has closely combined the protection of geological heritages with the promotion of sustainable development of local economy, which has become the best way to protect geological heritages. The geological heritages in Xinjiang, China, are characterized by their large quantity, rich variety and high grade. The complicated geologic-geomorphic environment in Xinjiang contributes to the creation of various geological heritage types and their spatial distribution, and at the same time makes them under control. The main types of the geological heritages in Xinjiang are the geologic- geomorphic landscapes and the water landscapes. The spatial distribution can be divided into five geological heritage districts: Altay, Junggar, Tianshan, Tarim and Kunlun-Altun, among which Tianshan and Kunlun-Altun are most important. Based on the first systematic investigation of the geological heritages in Xinjiang, it is confirmed that the insufficient coordination between protection and exploitation is the primary cause for the backward situation in the geological heritage protection. To solve the problem, this paper proposes 6 major protection steps—from determining the protection types, the protection forms, the protection modes, the protection grades, the protection sequences to determining the protection zones, brings forward the idea of optimal-selection which integrates geoparks with geological heritage protection areas and other protection areas as well as 5 corresponding modes, and makes a protection and exploitation reserve list for 209 important geological heritages in Xinjiang.  相似文献   

上海市九段沙湿地生态科普园规划设计     

孙瑛  胡山 《湿地科学与管理》2010,6(3):16-18

在紧邻大都市的上海九段沙湿地国家级自然保护区上沙实验区范围内,根据地形地势,潮沟水系走向,因地制宜规划设计一个5km2环保低碳,具有湿地保育、监督管理、科学研究和宣传教育于一体的多功能湿地生态科普园,让久居城市的人们远离喧嚣,营造一种宁静清幽、寓教于乐、回归大自然的亲切感。从设计目标、原则、理念和总体布局等方面阐述了九段沙湿地生态科普园的建设思路,为生态、低碳、环保、科学建设九段沙湿地生态科普园提供参考。  相似文献   

A point based Eulerian definition of rain event based on statistical properties of inter drop time intervals: An application to Chilbolton data     

Massimiliano Ignaccolo  Carlo De Michele 《Advances in water resources》2010

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