SD法在湖北大冶鸡冠嘴铜金矿床资源储量核实中的应用   总被引：4，自引：0，他引：4  

朱志祥  晏玖德 《地质与勘探》2004,40(4):82-84

SD法是一种全新的储量计算和审定方法,是我国使用的三大储量计算方法(传统法、克里格法和SD法)之一.根据国土资源部的指示和要求,湖北三鑫金铜股份有限公司和北京恩地科技发展有限责任公司共同对矿区的13条勘探线、20个矿体、16个中段的资源储量运用SD法进行了全面的复核计算,成功地确定了鸡冠嘴铜金矿矿床-160～-170 m、-170～-470 m、-470 m以下铜和金的保有储量.  相似文献   

A hard-knock life: the foraging ecology of Cape cormorants amidst shifting prey resources and industrial fishing pressure     

《African Journal of Marine Science》2013,35(2):233-240

Once one of the most numerous seabirds of the Benguela upwelling system, the population of Cape cormorants Phalacrocorax capensis has decreased by 60% in the past three decades and the species is listed as Near Threatened. Declines in prey availability and/or abundance brought about by recent changes in the distribution of pelagic fish stocks and industrial purse-seine fishing are hypothesised to be a key driver of seabird population decreases in the southern Benguela. We investigated the foraging behaviour of breeding Cape cormorants by deploying GPS and temperature–depth recorders on 24 breeding adults from three islands off the coast of South Africa, two of them to the north of Cape Point and a third farther south on the western Agulhas Bank. This provided the first measures of foraging dispersal by a cormorant in the Benguela system, and enabled a comparison of foraging behaviour between birds from these islands. Foraging trips of Cape cormorants lasted between 17 min and >7 h, at a maximum distance of between 2 and 58 km away from their colony. Foraging effort was significantly greater for birds from farther north off the West Coast in terms of trip duration, distance travelled, number of dives and time spent flying compared to those from the southernmost island (Dyer), which is probably a response to low prey availability in the north. Coastal reserves that exclude pelagic fishing from inshore feeding grounds around Cape cormorant breeding colonies may result in increased local prey availability, which would benefit Cape cormorant populations.  相似文献   

山东省深部岩溶热储地热地质特征     

冯守涛  徐勇  杨询昌 《山东国土资源》2013,29(9)

山东省的深部岩溶热储分布在济阳坳陷区、临清坳陷区的凸起（潜）区和鲁中隆起区、鲁西南潜隆起区、沂沭断裂带,分布面积约4.4万km2,其分布范围与寒武—奥陶纪地层分布基本一致。深部岩溶热储可划分深部裂隙—岩溶热储和深部岩—溶裂隙热储2种类型,具层状及层状兼带状特征。该文在总结前人成果的基础上,对深部岩溶热储的埋藏与分布、水质、地温场特征、深部岩溶发育规律和地热流体形成条件进行了论述,以期能对开发利用这一热储有所帮助。  相似文献   

上海沿海风能资源评估   总被引：2，自引：0，他引：2  

王晓亮  孙同美  徐晶晶  齐安翔  陈美榕 《海洋技术学报》2012,31(1):107-110

利用上海沿海5个站点风要素资料,通过统计分析,估算上海海域可开发的风能储量。东海大桥附近海域、崇明岛以东海域、南汇和横沙东滩以东海域、远海风电场为丰富区,风能资源储量约为3 373.1×104 kW;杭州湾北岸奉贤海域为较丰富区,风能储量约为38.3×104 kW;长江口水域为可利用区。  相似文献   

基于三维评价的福建省FDI环境地域分异研究     

陈文成  郑伟民 《世界地理研究》2008,27(3):119-125

以2000～2007年福建统计年鉴为数据源,FDI环境评价指标体系为GIS相应粒度多边形的属性结构,构建时态空间数据库。通过属性检索、运算,将所有指标转换成熵降型及值为正,利用频率法将指标测度变换为概率,根据玻尔兹曼熵定理将概率映射为熵,熵再对立变换为有序度,建立基于因子分析的权重矩阵的动态赋权法三维评价模型,进行福建省设区市FDI环境三维评价,从1999～2006年福建省FDI环境发展不平衡格局的动态切入分析地域分异。  相似文献   

辽河流域土壤碳密度分布特征和碳储量研究     

于成广  杨晓波  刘明华  王丹阳  王大鹏 《地质与资源》2011,20(4):272-277

基于辽河流域多目标地球化学调查取得的土壤表层和深层有机碳和全碳数据,探讨辽河流域土壤碳储量计算方法,分析辽河流域碳密度的分布特征.对辽河流域5.23×10⁴ km²土壤碳储量计算表明,深层（0~1.8 m）土壤碳储量为860.50×10⁶ t,中层（0~1.0 m）为538.30×10⁶ t,表层（0~0.2 m）为138.76×10⁶ t;辽河流域土壤深层碳密度为16.45×10³ t/km²,中层为10.28×10³ t/km²,表层为2.65×10³ t/km².分别根据土壤类型、地质单元、生态系统和土地利用类型的划分方式计算土壤的碳储量,为土壤碳循环研究与环境效应评价提供了科学依据.  相似文献   

历史时期流域生态安全探研——以汾河上游为例   总被引：1，自引：1，他引：0  

王尚义  张慧芝  马义娟  孟万忠 《地理研究》2008,27(3):556-564

本文选择了位于生态脆弱区的汾河上游为研究区域,运用"系列横剖面"、"压力-状态-响应"框架模型等方法,对历史时期流域生态安全问题进行了尝试性探索。研究表明:与历史时期社会生产技术水平相适应,人类对环境的干预及应对环境变迁的能力较低,故历史时期流域生态安全也存在波动变化;研究历史时期生态脆弱地带的流域生态安全,人口数量、耕地数量、畜牧业开发程度、国家政策、战争频次等应是主要指标;在"压力-状态-响应"评价体系下,压力、状态指标安全指数呈下降趋势,响应指标安全指数反之,民间控制行为的出现反证了生态演变程度的加剧。本文研究复原了历史时期汾河上游生态安全演变态势,但如何量化不同阶段的流域生态阈值,并进行生态安全性的判别等,尚待进一步深入研究。  相似文献   

中国草原旅游研究的进展与展望   总被引：1，自引：0，他引：1  

吕君  吴必虎 《地理科学进展》2010,29(4)

草原旅游发展在我国逐渐成为热点,研究文献不断出现。20世纪90年代以来的研究主要集中在旅游发展战略、旅游经济研究、地方旅游资源开发、旅游地管理、旅游环境影响、旅游资源一般理论、旅游产品研究、旅游美学研究、旅游文化研究、目的地营销、旅游纪念品和旅游法规等领域。研究具有明显的时段性,作者所在地域与研究区域具有高度一致性,研究内容过于集中,研究方法以定性描述为主。今后要注意规范旅游研究方法,注重多学科交叉相融,细化研究领域,拓展研究方向。  相似文献   

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method   总被引：4，自引：2，他引：2  

Yili Zhang  Zhongjun Hu  Wei Qi  Xue Wu  Wanqi Bai  Lanhui Li  Mingjun Ding  Linshan Liu  Zhaofeng Wang  Du Zheng 《地理学报(英文版)》2016,26(1):27-44

Twenty-one typical coupled large samples were chosen from areas within and surrounding nature reserves on the Tibetan Plateau using the large sample comparison method (LSCM). To evaluate the effectiveness of the nature reserves in protecting the ecological environment, the alpine grassland net primary production (NPP) of these coupled samples were compared and the differences between them before and after their establishment as protected areas were analyzed. The results showed that: (1) With respect to the alpine grassland NPP, the ecological and environmental conditions of most nature reserves were more fragile than those of the surrounding areas and also lower than the average values for the Tibetan Plateau. (2) Of the 11 typical nature reserves selected, the positive trend in the NPP for Manzetang was the most significant, whereas there was no obvious trend in Taxkorgan. With the exception of Selincuo, the annual NPP growth rate in the nature reserves covered by alpine meadow and wetland was higher than that in nature reserves consisting of alpine steppe and alpine desert. (3) There were notable findings in 21 typical coupled samples: (a) After the establishment of the nature reserves, the annual rate of increase in the NPP in 76% of samples inside nature reserves and 82% of samples inside national nature reserves was higher than that of the corresponding samples outside nature reserves. (b) The effectiveness of ecological protection of the Mid-Kunlun, Changshagongma, Zoige and Selincuo (Selin Co) nature reserves was significant; the effectiveness of protection was relatively significant in most parts of the Sanjiangyuan and Qiangtang nature reserves, whereas in south-east Manzetang and north Taxkorgan the protection effectiveness was not obvious. (c) The ecological protection effectiveness was significant in nature reserves consisting of alpine meadow, but was weak in nature reserves covered by alpine steppe. This study also shows that the advantage of large sample comparison method in evaluating regional ecology change. Careful design of the samples used, to ensure comparability between the samples, is crucial to the success of this LSCM.  相似文献   

中国可供性煤炭资源潜力分析   总被引：3，自引：0，他引：3       下载免费PDF全文

王永王佟  康高峰  林燕 《中国地质》2009,36(4):845-852

以全国第三次煤田预测数据为基础,通过对查明煤炭资源量和未查明煤炭资源量的分布、埋藏深度和煤类的系统分析,指出中国查明尚未占用的煤炭储量2282.97亿t,经济可采储量仅684.89亿t。未查明的预测煤炭资源量45521.04亿t,潜力巨大,但在近期可供找煤普查的埋深小于1000m的预测可靠级煤炭资源量只有9169.10亿t。因此,必须科学地、客观地再认识中国煤炭资源优势,合理地制定国家能源政策,以确保中国能源安全。  相似文献