Digital Identification of Ecosystem Structure in the FIrtIna Valley of the Kakar Mountains in the Rize City of Turkey     

agasan KARACAOGLU  Selim Sualp AGLAR 《山地科学学报》2014,(2)

Identifying the structure of protected mountain ecosystems is an important task for understanding conservation sustainability. The study area, the Firtina Valley, located in the Rize City on the Eastern Blacksea Coast, is one of the biological hotspots and a National Park of Turkey. In order to identify the structure of mountain ecosystems, we generated a GIS database for the main environmental parameters of the study area, including elevation,slope and aspect layers for topographic structure, 10year mean values of Normalized Difference Vegetation Index(NDVI), data for vegetation structure, annual mean temperature and precipitation layers for climatic structure, main soil groups for soil structure and stream flow accumulation, stream flow length and stream order layers for hydrological structure.To identify the complex relations among environmental factors in the study area a data reduction method is applied with Principal Component Analysis(PCA). PCA is performed using data of 16 layers from Geographical Information Systems(GIS). PCA analysis reduced 16 dimensions into 5 dimensions containing 75% of the variation in all data. It is also revealed that the topographic structure, mainly altitude, dominates the ecosystems of the Firtina Valley, but it should be considered that the interactions of environmental factors in an ecosystem dynamics are very complex. The ecosystem structure is determined by the environmental factors direct or indirect effects on energy regulation of an ecosystem. Therefore the relationship between topographic elements and other abiotic-biotic elements in the Firtina Valley are important for environmental assessment and sustainability of a protected area, and these effects are explained in this study.  相似文献   

基于价值链理论的海湾扇贝价值增值研究     

孙瑜  ;于千钧  ;慕永通 《广东海洋大学学报》2014,(5):23-27

以迈克尔?波特的价值链理论为基础,结合海湾扇贝的特点,对海湾扇贝产业中价值增值的关键节点进行实证研究。研究发现,从价值构成结构看,资金、技术、劳动、管理等在各环节中对增值的作用也有较大差异。在育苗阶段,技术的作用非常明显;在养殖阶段,自然环境和劳动付出成为价值提升的关键所在;在加工阶段,资金、技术、劳动、管理等共同提升了价值;在销售阶段,推动价值提升更表现在"软实力"上。  相似文献   

From fishing to farming: Shellfish aquaculture expansion and the complexities of ocean space on Canada's west coast     

《Applied geography (Sevenoaks, England)》2014

Ocean spaces are social and political, and just as with terrestrial governance, oceans governance is prone to ambiguity, contradiction, and contestation. The validity and dynamics of these claims will be demonstrated through a study of discourse and structured agreements employed to involve coastal First Nations in the expansion of the shellfish aquaculture sector in British Columbia. Analysis focuses on the West Coast of Vancouver Island, a region identified as having good biophysical potential for shellfish aquaculture and much of which is territorial home of the Nuu-chah-nulth First Nations. Through community interviews and document and discourse analysis, the article highlights that: seafood, including shellfish, is intimately connected with Nuu-chah-nulth identity; many Nuu-chah-nulth have long-engaged in subsistence and commercial harvests of wild-growing shellfish; and, there are important prospective differences between longer-standing shellfish harvests and shellfish aquaculture. Findings and discussion offer perspective on the sorts of choices that First Nations might encounter in the pursuit of shellfish aquaculture, as well as raise bigger questions about whether or how Nations might tradeoff territorial authority and collective harvest opportunities against leasing state-sanctioned private marine tenures.  相似文献   

等熵位涡在一次淮河流域大暴雨分析中的应用   总被引：1，自引：0，他引：1  

吴迪  何艳娜  楚志刚 《气象科学》2016,36(6):732-741

利用NCEP/NCAR 1°×1°逐日再分析资料、常规气象观测资料,通过等熵位涡理论对淮河流域2009年9月24—25日的大暴雨过程进行分析。结果表明:淮河流域对流层低层的中尺度低涡的发生发展与此次暴雨密切相关;315 K等熵位涡高值中心的移动和强度变化很好地反映出中尺度低涡系统的发展变化情况,其移动方向与雨带走向一致,降水落区主要位于等熵位涡高值中心轴线移动方向右侧的强西南气流处,对应于345 K等熵面上干冷空气移动方向前部的暖湿区内;在暴雨发展强盛时期,淮河流域暴雨区上空从对流层高层至低层均存在明显的正等熵位涡平流,干冷空气的侵入使得低涡加强发展,辐合上升运动增强,有利于暴雨的增幅,这是引发此次暴雨过程重要的触发机制。  相似文献   

莫坝-希拉沟地区水系沉积物地球化学特征及找矿     

胡朝云  秦宇龙  阚泽忠 《四川地质学报》2012,(4):487-491,502

莫坝-希拉沟地区16个元素水系沉积物测量地球化学特征研究表明,贫乏元素有Au、Hg、Mo;正常元素有Cu、Pb、Zn、Co、Mn、W、Sn、Bi;富集元素有As、Sb、Ag、Fe、Ni;无强富集的元素。通过各元素空间分布研究,对主要地球化学异常进行推断解释,指出三叠系地层、尤其与喷出岩有关的地区是寻找Cu、Pb、Zn、Au、Ag等多金属矿的有利地区。  相似文献   

Late Palaeozoic 40Ar/39Ar ages of the HP-LT metamorphic rocks from the Kekesu Valley,Chinese southwestern Tianshan: new constraints on exhumation tectonics     

《International Geology Review》2012,54(4):389-404

abstract

Although numerous ages have been obtained for the Chinese southwestern Tianshan high pressure/ultrahigh pressure-low temperature (HP/UHP-LT) metamorphic belt in the past two decades, its exhumation history is still controversial. The poor age constraint was related to the appealing low metamorphic temperatures and excess Ar commonly present under HP/UHP conditions. This study aims to provide new age constraints on the orogen’s exhumation by obtaining ⁴⁰Ar/³⁹Ar mica ages using the conventional step-heating technique, with emphasis on the avoidance of excess Ar contamination. From a cross section along the Kekesu Valley, four samples, three from the HP-LT metamorphic belt (TK050, TK051, and TK081) and one from the southern margin of the low pressure metamorphic belt (TK097), were selected for ⁴⁰Ar/³⁹Ar dating. Phengites from garnet glaucophane schist TK050 and the surrounding rock garnet phengite schist TK051 yield comparable plateau ages of 321.4 ± 1.6 and 318.6 ± 1.6 Ma, respectively, while epidote mica schist TK081 gives a younger plateau age of 293.3 ± 1.5 Ma. Considering the chemical compositions of phengites, mineral assemblages, and microstructures in the thin slices, we suppose that the former represents the time the HP rocks retrograded from the peak stage (eclogite facies) to the (epidote)-blueschist facies, whereas the latter reflects greenschist facies overprinting. Biotite and muscovite from two-mica quartzite TK097 give similar plateau ages of 253.0 ± 1.3 and 247.1 ± 1.2 Ma, interpreted to date movement on the post collisional transcrustal South Nalati ductile shear zone. By combining our new ages with published data, a two-stage exhumation model is suggested for the Chinese southwestern Tianshan HP/UHP-LT metamorphic belt: initial fast exhumation to a depth of about 30–35 km by ~320 Ma was followed by relatively slow (~1 mm year^–1) uplift to ~10 km by ~293 Ma.  相似文献   

盐生植物萌发期对盐胁迫的适应研究进展          下载免费PDF全文

胡娟  张洁  盛洲  周宸宇  张旭萍  拉本 《盐湖研究》2022,30(1):95-100

目前我国盐溃土地面积较大,尤其是青藏高原的盐溃地,常伴有干旱、半干旱的生境,导致植物不易生长,生态环境相对恶劣,这种生态现状亟待解决.盐生植物具有一定的耐盐性和耐旱性,是改善盐渍地的首选植物,种子的活力决定了种子萌发的情况,多数学者为改善严峻的生态环境开始了盐生植物引种的研究.测定种子活力有直接方法和间接方法,大多数学...  相似文献   

Spatial management measures for disease mitigation as practiced in Scottish aquaculture     

《Marine Policy》2016

Aquaculture is an increasingly important economic activity in coastal waters. The fluid environment means spatial management is an important tool for protecting fish health. Scottish aquaculture (largely Atlantic salmon) uses a range of different types of area to group farms for different management or reporting purposes related to fish health. Farm Management Areas are defined by local knowledge and used by industry for co-operation among groups of farms, including in the management of sea lice. Disease Management Areas, defined using a simple but robust model, are used by the Scottish Government for control of notifiable diseases. Particle dispersal models are used to assess areas affected by treatment residue around farms, and to manage maximum allowable area biomass for environmental protection. Sophisticated models of sea lice transport have been developed to help inform management of this key parasite. Large regional areas are used for a variety of purposes, such as a policy presumption against new farms covering the entire east and north coasts of Scotland, and five reporting areas for official production statistics. Scottish aquatic environments are shared by many interest groups and spatial management is proving essential for sustainable development by aquaculture and other users.  相似文献   

海洋能开发利用发展对策研究   总被引：2，自引：0，他引：2       下载免费PDF全文

麻常雷  夏登文 《海洋开发与管理》2016,33(3):51-56

海洋能具有储量巨大、绿色清洁等特点,是全球应对气候变暖、调整能源结构的重要选择之一,欧、美等发达海洋国家非常重视发展海洋能,将其作为战略性资源进行技术储备。我国海洋能资源既有着总量丰富、种类齐全、区域性强等优势,也存在密度较低的劣势。在财政部、科技部、国家海洋局等的大力支持下,我国海洋能利用技术取得了明显进步,潮流能和波浪能等代表性技术和装置经历了长期海试,为稳定示范应用奠定了坚实的基础。在建设海洋强国、实施国家能源战略、发展战略性新兴产业、推进生态文明建设、21世纪海上丝绸之路的背景下,随着我国海洋能核心关键技术的不断突破,海洋能装备制造及运行维护必将成长为对经济社会长远发展具有重大引领带动作用的战略性新兴产业。  相似文献   

“中国宝谷”正在起航——武汉东湖国家珠宝文化旅游产业基地建设初探     

杨树旺  邓宏兵  郝义国 《地质科学译丛》2014,(1):50-55

珠宝旅游产业是现代工业和服务业发展的重要组成部分,依托中国地质大学和东湖风景区,建设武汉东湖国家珠宝旅游产业基地（“中国宝谷”）非常必要。本文提出了基地建设的总体框架设计方案,分析了基地建设背景与必要性,探讨了基地建设基础与可行性。文章指出,要在武汉市东湖风景区磨山景区南部南望山北部及毗邻地区建设国家级珠宝旅游产业基地、构筑“中国宝谷”,形成特色鲜明的旅游目的地。空间上形成“一核（教育与研发极核）一街（鲁磨路珠宝一条街）三区（珠宝创意设计与科教游览区、珠宝文化鉴赏与休闲度假区、珠宝展示交易与旅游购物区）”格局。文章认为,基地建设是国际国内珠宝文化旅游大发展和良好的基础调节有机结合的必然产物,前景广阔,对推动区域经济发展具有重要意义。  相似文献