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西藏南羌塘盆地重要湖盆孢粉组合与环境意义 被引量:1
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作者 赵淼 张文卿 +5 位作者 蔡五田 李颖智 耿婷婷 张涛 张智印 张学敏 《地理科学》 CSSCI CSCD 北大核心 2018年第6期987-996,共10页
对南羌塘盆地内流湖盆区多个湖盆晚更新世—全新世地层孢粉组合进行分析,采用蒿属(Artemisia)与藜科(Chenopodiaceae)比值(A/C值)和麻黄(Ephedra)、藜科、蒿属含量变化趋势分析,恢复了该地区的植被与气候变化特征,总结了3个钻... 对南羌塘盆地内流湖盆区多个湖盆晚更新世—全新世地层孢粉组合进行分析,采用蒿属(Artemisia)与藜科(Chenopodiaceae)比值(A/C值)和麻黄(Ephedra)、藜科、蒿属含量变化趋势分析,恢复了该地区的植被与气候变化特征,总结了3个钻孔和区域上湖盆环境干湿度变化规律:扎仓茶卡湖盆南侧、搭拉不错湖盆南侧,呈针阔叶混交森林草原植被,气候总体温暖湿润;别若则错湖盆西侧,呈针阔叶混交疏林植被,气候总体较寒冷干燥。区域上由西向东干燥程度逐渐加强,佐证了通过孢粉组合分析得出的气候变化特征。此次成果对南羌塘盆地湖盆区气候演变趋势具有重要的研究意义。 展开更多
关键词 词:羌塘盆地 内流湖盆 孢粉组合 气候 干燥程度
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黄颡鱼苗市场缩水50%,年底行情看涨
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作者 李建宇 《当代水产》 2015年第11期34-34,36,共2页
10月已过,黄颡鱼今年的最后一次投苗可以说已经结束了,5、6月投放的鱼苗已经上市。珠三角地区10月下旬至11月初的这一段时间,黄颡鱼的价格稳中有涨,规格150~250g的价格在9.6~9.7元/500g之间,比10月初涨了0.5元/500g,规格在300g的价钱在1... 10月已过,黄颡鱼今年的最后一次投苗可以说已经结束了,5、6月投放的鱼苗已经上市。珠三角地区10月下旬至11月初的这一段时间,黄颡鱼的价格稳中有涨,规格150~250g的价格在9.6~9.7元/500g之间,比10月初涨了0.5元/500g,规格在300g的价钱在10元左右,与10月初相比涨了0.4元/500g。在淡水鱼行情普遍惨淡的情况下,黄颡鱼到现在还能保持9元/500g以上的价格,非常不易。有人说,现在黄颡鱼的价格之所以这么好,是因为开花不顺,鱼苗成活率低, 展开更多
关键词 鱼苗成活率 行情看涨 人说 最后一次 鱼价格 加州鲈 养殖量 键南 分塘 产销情况
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A worldwide bibliometric analysis of Antarctic krill research during 1960 to 2015
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作者 Fei Liu 《Chinese Journal of Population,Resources and Environment》 2017年第4期357-364,共8页
This study conducted a bibliometric analysis of 1251 articles related to Antarctic krill from 1960 to 2015, based on the Core Collection in Thomson Reuters' Web of Science. We analyzed the results from four aspects:... This study conducted a bibliometric analysis of 1251 articles related to Antarctic krill from 1960 to 2015, based on the Core Collection in Thomson Reuters' Web of Science. We analyzed the results from four aspects: annual distribution, Web of Science categories and the major journals, inter- national collaboration and author keywords. The Antarctic krill research has developed rapidly since 1978, with an increasing article output. The studies mostly focused on the fields of marine and freshwater biology, oceanography, and ecology. Polar Biology, Marine Ecology-Progress Series and Deep-Sea Research Part II-Topical Studies in Oceanography, were the top three journals to publish the Antarctic krill-related papers. Although Russia is the earliest state to report Antarctic krill, U.S.A. and England were leaders with the largest output quantity and the highest cooperation frequencies. The researches in PR China have taken a blooming since 2009 and will play a more and more important role in the world. The frequencies of author keywords were counted. The high-frequency keywords were further divided into four groups with cohesive subgroup analysis, which suggested the major themes. This paper depicts the existing publica- tions on Antarctic krill. Our goal is to serve a point of reference and provide the direction for the future work. 展开更多
关键词 Antarctic krill PUBLICATIONS keywords analysis bibliometric analysis
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Conceptual Framework for Key Element Identification in Important Agricultural Heritage Systems(IAHS):Case of Honghe Hani Rice Terraces System in China 被引量:3
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作者 LI Heyao HE Siyuan +2 位作者 DING Lubin MA Nan MIN Qingwen 《Journal of Resources and Ecology》 CSCD 2021年第4期522-531,共10页
With the continuous emergence of global development problems,the dynamic conservation and sustainable development of Important Agricultural Heritage Systems(IAHS)have been assigned greater importance.However,due to th... With the continuous emergence of global development problems,the dynamic conservation and sustainable development of Important Agricultural Heritage Systems(IAHS)have been assigned greater importance.However,due to the complex structure,multi-component,dynamic,and open characteristics of IAHS,there are neglected problems which need to be solved in conservation practice,such as component element ambiguity,obscurity of the conservation redline,etc.This study defined the concept of key elements(KE)of IAHS,put forward a conceptual framework of KE identification,conducted empirical research by taking Honghe County of Honghe Hani Rice Terraces System(HHRTS)as an example and analyzed the level of recognition motivations for different stakeholder groups.The following conclusions were drawn:1)The KE of HHRTS are grain crops,rice species biodiversity,terrace construction and maintenance technique,Hani traditional festivals,Hani traditional foods,and virgin forest;2)The reasons behind the KE priorities of farmers,businessmen and tourists were at the micro level,the reasons of officers were at the middle level and the reasons of researchers were at the macro level.The empirical study conducted in HHRTS showed that the proposed conceptual framework could identify KE of IAHS effectively,and provided a theoretical perspective for the structuring of and essential need for IAHS research.Moreover,the KE recognition levels of different stakeholder groups reflected their potential action strategies.We should focus on the coherence of policies and measures in both the microscale and macroscale to balance the diversified demands of stakeholders,and to stimulate their enthusiasm for participation in the conservation in order to improve the management level of IAHS sites. 展开更多
关键词 Important Agricultural Heritage Systems(IAHS) Key Elements(KE) Honghe Hani Rice Terraces System(HHRTS) IDENTIFICATION STAKEHOLDERS
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