流动群体跨地方饮食适应的多元策略及身份协商——广州案例     

曾国军  林家惠  钟淑如 《地理科学进展》2022,41(4):660-669

流动性语境中,流动群体因其承载的源地文化基因与在地饮食文化的碰撞,不可避免地陷入维系源地饮食与融入在地饮食的两难境地,从而引发了饮食调适与身份焦虑等问题。尽管学界探讨了流动群体在不同饮食文化影响下的调适策略,但大多将固守源地文化与接纳在地文化进行对立,忽视了个体能动的协商过程。论文基于文化地理学视角,以广州流动群体为研究对象,分析他们在跨地方饮食适应过程中采取的多元策略及身份协商。研究发现,在不同地方饮食文化的影响下,流动群体跨地方饮食适应的策略包括饮食同化、饮食融合、饮食隔离与饮食边缘化。在不同策略之下,流动群体的日常饮食实践呈现出差异化的特征,并使得原本单一的源地身份认同趋于复杂化。论文提出了跨地方饮食适应的分析框架,讨论了饮食适应的多元策略与身份协商之关系,为文化地理学视角下的移民与饮食研究提供了新的理论视野,在实践层面上有利于促进流动群体的饮食适应与社会融入。  相似文献   

结构性黏土的压缩变形特性   总被引：1，自引：0，他引：1  

陈盼  韦昌富  李永和  王吉利  马田田  魏厚振 《岩土力学》2012,33(Z2):29-0037

海相软黏土的结构性对土体的变形与强度特性有着重要的影响,这种影响与爆炸挤淤置换法处理软基的置换深度直接相关,是海堤基础沉降与稳定性分析的不确定因素。为了探究结构性对海堤地基沉降的影响,并对海相软黏土的压缩特性进行定量分析,建立结构性黏土的压缩变形模型,同时给出模型参数的确定方法。利用文献中的试验数据对模型进行了验证,结果表明模型不仅适用于一维应力状态下的变形分析,能够描述三轴应力状态下结构性黏土的压缩特性。利用所建模型对浙江漩门地区海相软黏土的压缩特性进行模拟,分析表明,模型能较好地考虑结构性对该地区软黏土压缩变形的影响,为该地区海堤沉降的预测提供量化分析的手段,有助于加强结构性黏土地区海堤地基设计与施工的理论基础。  相似文献   

Diet and food resource partitioning in koaro,Galaxias brevipinnis (Günther), and juvenile rainbow trout,Oncorhynchus mykiss (Richardson), in two Taupo streams,New Zealand     

Ian A. Kusabs  Stephen Swales 《新西兰海洋与淡水研究杂志》2013,47(3):317-325

This study examined the diet of sympatric populations of migratory juvenile rainbow trout and landlocked koaro in the Waipehi and Omori Streams, Lake Taupo, New Zealand. In both species, diet was dominated, both numerically and by weight, by aquatic prey: Ephemeroptera, Trichoptera, and Diptera larvae were the most numerous prey items. Adult koaro and juvenile rainbow trout both fed on small koaro. Terrestrial prey items were present in low numbers in the diets of both koaro and juvenile rainbow trout, but were more important in terms of weight. Resource partitioning was weak although koaro consumed more small benthic invertebrates such as chironomid larvae, whereas the diet of rainbow trout contained more Ephemeroptera larvae and terrestrial insects. In the Waipehi Stream, koaro consumed both rainbow trout ova and koaro ova; in Omori Stream, trout ova were important in the diet of juvenile rainbow trout. Since the diets of koaro and juvenile rainbow trout in some Taupo tributaries are similar, populations may co‐exist by temporal and/or spatial partitioning of food resources, whereas trout predation on small koaro may be a limiting factor for koaro populations.  相似文献   

Foraging across ecosystems: diet diversity and social foraging spanning aquatic and terrestrial ecosystems by an invertebrate     

Mark E. Laidre 《Marine Ecology》2013,34(1):80-89

Ecosystems are fundamentally connected to one another, although empirical documentation of the links between them, especially the links between marine and terrestrial ecosystems, has been limited. This study examined the foraging behavior and ecology of an understudied invertebrate, the hermit crab Coenobita compressus, which is remarkably abundant at the nexus of marine, terrestrial, and freshwater ecosystems. Data collected between 2008 and 2011 in the Osa Peninsula of Costa Rica revealed that C. compressus plays a generalist scavenger role across ecosystems. Beach almond fruits (Terminalia catappa) were a staple of the crabs’ diet, but the crabs also commonly consumed a variety of other fruit species and various parts of plants (nuts, seeds, flowers, husk, stems, buds) as well as algae, fungus, animal feces, and the carcasses of insects, jellyfish, conspecifics, other crustacean species, freshwater and saltwater fish, sea turtles (eggs and adults), and mammals. The crabs fed on these resources in prominent social aggregations, also forming such aggregations as they exchanged the aquatically derived gastropod shells that they use as homes while roaming the land. The size of the crabs’ aggregations around plant versus animal resources and around terrestrial versus aquatic resources did not differ, underscoring the species’ generalist foraging behavior. Broadly, these results suggest that C. compressus has one of the most diverse diets of any crustacean and plays a critical role in recycling organic matter and nutrients. This species might also mediate the passage of resources across different ecosystems, although further research is needed to explore this possibility.  相似文献   

原位同管径换管技术及其在煤气管道改造中的应用          下载免费PDF全文

吴礼林  李兰  罗灿保  潘思发 《探矿工程》2014,41(12):75-79

结合宜春深燃有限公司城市煤气铸铁管改造工程,详细介绍了原位同管径换管技术施工工艺及技术要点。  相似文献   

地理环境对中国饮食文化旅游资源的影响   总被引：1，自引：0，他引：1  

卢宏 《云南地理环境研究》2012,24(2):33-36

饮食是人类赖以生存和发展的首要物质基础,也是旅游的六大要素之一。主要从自然和人文地理环境各因素对中国饮食文化形成和饮食文化旅游资源开发的影响方面进行分析。在进行饮食文化旅游资源开发时,应特别重视地理环境因素的影响。  相似文献   

山西芮城清凉寺墓地出土人骨的稳定同位素分析          下载免费PDF全文

凌雪  陈靓  薛新明  赵丛苍 《第四纪研究》2010,30(2):415-421

对山西芮城新石器时代的清凉寺墓地出土的仰韶文化和龙山文化两个阶段人骨中C和N同位素进行了分析,研究了先民的食谱特征和生活经济形式,探讨了不同性别之间食物结构的差异以及不同阶段食谱的变化趋势。所有人骨样品的C和N含量以及C/N 摩尔比,均表明人骨样品保存较好,可用于食谱分析。骨胶原的C和N稳定同位素分析结果显示,清凉寺地区史前先民的食物结构中包括C4类植物和少量以C₄类植物为食的动物,反映了先民以种植粟、黍等作物的农业形式,并辅以饲养家畜为生的经济模式;  发现男性比女性获取肉类食物相对较多,可能是由于当时男女社会分工不同的缘故;  此外,从仰韶文化到龙山文化时期,山西芮城清凉寺先民获取植物性食物资源没有明显变化,但肉类资源有所增加,反映了此时的农业生产逐渐趋向更为稳定,家畜饲养有了进一步的发展。  相似文献   

DIETARY MANGANESE REQUIREMENT OF P. VANNAMEI   总被引：1，自引：0，他引：1  

刘发义 《中国海洋湖沼学报》1997,(2)

M0DUonONManganeseisanessentialelernentfororganismss.TherearernanypublishedreportS0ntheMnrequdritSoritSdrionfishes,indudingrainb0wtrout,channelcatfish,Atianticsalmon,cornmncarp,grasscarp,tilapia,Ctc.Kanamwaetal.(l984)andLiCtal.(l992)reportedtheresultSoftheiraseawhonthernanganeserequdritSofjuvenileP.japonicusandP.chinensiS.Davisandhawrence(l99O)studndthetheofdietaryman-ganeseonP.vannameibydeletionofMnfromthendneralpedinasdri9udrieddiet.ThepresentstudyontheefhaofgtadedleveIs0frnanganeses…  相似文献   

Diet of harbour seals and great cormorants in Limfjord, Denmark: interspecific competition and interaction with fishery     

Andersen  Signe M.; Teilmann  Jonas; Harders  Pernille B.; Hansen  Else H.; Hjollund  Dorthe 《ICES Journal of Marine Science》2007,64(6):1235-1245

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淤泥EPS颗粒混合轻质土黏聚力的一种计算方法     

李明东  朱伟  汤峻  张春雷 《岩土力学》2006,27(Z2):132-136

在疏浚淤泥中添加固化材料和EPS颗粒制作成淤泥EPS颗粒混合轻质土,既可以资源化利用疏浚淤泥,又生产一种轻质高强的土工材料。强度是EPS颗粒混合轻质土最重要的工程特性之一,建立抗剪强度参数与原材料的性质和配比之间的关系式对于配方初步设计非常重要。EPS颗粒混合轻质土强度的形成是固化材料的固化作用和EPS颗粒的置换效应的综合表现,固化作用已经较为明确,置换效应的研究是确定强度的核心。在已知固化土(水泥土)的弹性模量和泊松比的前提下,针对EPS颗粒的置换效应,根据其剪切面上力的等效关系和变形协调关系以及EPS颗粒的物理关系建立了其黏聚力与EPS颗粒密度和添加量之间的关系式,利用原材料的性质对计算方法进行了简化;利用直接剪切试验获取了淤泥EPS颗粒混合轻质土的黏聚力,验证了上述关系式。  相似文献