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青海省保护地辣椒根际土壤和根表放线菌研究 被引量:42
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作者 蔡艳 薛泉宏 +4 位作者 陈占全 司美茹 孙小凤 阿继军 张荣 《应用与环境生物学报》 CAS CSCD 2003年第1期92-96,共5页
采用常规方法研究了青海省大棚和温室中辣椒健株、病株根际土壤和根表的微生物数量、放线菌组成及拮抗性放线菌的分布 .结果表明 :①青海保护地辣椒根际土壤和根表微生物以细菌为主 ,放线菌次之 ,真菌最少 ,三者数量之比为 10 5 10 2 1... 采用常规方法研究了青海省大棚和温室中辣椒健株、病株根际土壤和根表的微生物数量、放线菌组成及拮抗性放线菌的分布 .结果表明 :①青海保护地辣椒根际土壤和根表微生物以细菌为主 ,放线菌次之 ,真菌最少 ,三者数量之比为 10 5 10 2 1(根际 )或 10 4 1 1(根表 ) ;②根际微生物数量和土壤速效N、P、K含量密切相关 ,速效养分含量高的土壤中微生物数量大 .辣椒病株根际土壤和根表细菌、放线菌及真菌三大类微生物数量显著高于健株 .③保护地辣椒根际土壤和根表放线菌组成较复杂 ,共分离到了 7个属的放线菌 ,但仍以链霉菌为主 ,其次为小单孢菌和马杜拉放线菌 .链霉菌可分为 10个类群 ,金色类群占优势 .健株根际土壤和根表放线菌组成较病株复杂 ,而链霉菌组成较病株简单 .④供试放线菌菌株中 9.0 %对G+ 细菌有拮抗活性 ,6 .7%对真菌有拮抗活性 ,对G-细菌均无拮抗作用 .健株根际土壤拮抗性放线放菌数量及其占放线菌总数的比例均高于病株 ,健株根表拮抗性放线菌占放线菌总数的比例亦高于病株 ,表明根际土壤中拮抗性放线菌的数量及根际和根表拮抗性放线菌占放线菌总数的比例是决定辣椒是否染病的关键因素之一 .表 4参 展开更多
关键词 保护地 辣椒 辣椒疫霉 放线菌 生物防治
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Bedouin farms in the Saint Katherine mountainous area(South Sinai,Egypt) 被引量:1
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作者 Kamal H.SHALTOUT Khaled H.EL-HAMDI +1 位作者 Safaa A.EL-MASRY Ebrahem M.EID 《Journal of Mountain Science》 SCIE CSCD 2019年第10期2232-2242,共11页
This study aims to assess the natural and cultivated plant species in 26 Bedouin farms in Saint Katherine Protectorate(SKP),identify their soil and water characteristics,and assess the suitability of these farms for t... This study aims to assess the natural and cultivated plant species in 26 Bedouin farms in Saint Katherine Protectorate(SKP),identify their soil and water characteristics,and assess the suitability of these farms for the cultivation of some wild medicinal plants.The farms were selected to represent wide wadis with deep sand and clay deposits,gorge-like wadis covered with rock fragments of different sizes,spot-like oases,and the Al Q’aa Plain.Using TWINSPAN(two-way indicator species analysis)and DCA(detrended correspondence analysis)techniques,the 26 farms were classified into 5 groups(Ⅰ-Ⅴ)based on their floristic composition of wild plants.These groups reflect an elevation gradient among the farms above sea level from a mean of 119 m to a mean of1,865m.A total of 73 wild species were recorded,with47 in groupⅡ(500-1,000 m)and 25 in group V(>1,700 m).The common target species were Artemisia judaica,Acacia tortilis subsp.raddiana,Origanum syriacum subsp.sinaicum and Varthemia montana(34.6%-26.9%).The cultivated speciesnumbered 25,with 17 in groupⅡ(500-1,000 m) andⅡin groupⅣ(1,500-1,700 m).The common fruit trees were olive,grape,fig,apple,palm,almond,apricot and pomegranate(73.0%-42.3%).Based on the soil characteristics,13 farms belong to soil class 2that describes good soils with moderate limitations,and 12 belong to soil class 3 that describes moderately good soils,which can be used regularly for crops after proper treatment. 展开更多
关键词 AGROFORESTRY SAINT Katherine protectorate Wild MEDICINAL plants Elevation gradient Multivariate analysis WADI Feiran
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Radioactivity Levels and Soil-to-Plant Transfer Factor of Natural Radionuclides from Protectorate Area in Aswan, Egypt
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作者 S. Harb A. H. El-Kamel +2 位作者 A. I. Abd El-Mageed A. Abbady W. Rashed 《World Journal of Nuclear Science and Technology》 2014年第1期7-15,共9页
The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide (238U, 226Ra, 228Ra, 232Th, 40K and 137Cs) in samples from Saluga an... The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide (238U, 226Ra, 228Ra, 232Th, 40K and 137Cs) in samples from Saluga and Ghazal Protectorate area in Aswan, Egypt, by using High Pure Germanium detector (HPGe) Environmental Radioactivity Measurements Labrotary in faculty of science Qena. Reported values for natural radionuclides ranged from 8.81 ± 0.64 to 28.88 ± 2.10, from 6.98 ± 0.51 to 26.01 ± 1.89, from 12.29 ± 0.89 to 33.32 ± 2.43, from 12.53 ± 0.91 to 32.81 ± 2.39 and from 383.90 ± 27.95 to 711.98 ± 51.83 Bq.kg-1 for 238U, 226Ra, 228Ra, 232Th and 40K, respectively. 137Cs activity concentration was found to be in the range from 0.36 ± 0.03 to 9.73 ± 0.71 Bq.kg-1 and was calculated through transfer factor TF reported in this article. 展开更多
关键词 NATURAL Radionuclides TRANSFER FACTOR PLANT Soil protectorate Area
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Mycogenic Silver Nanoparticles From Endophytic Trichoderma atroviride with Antimicrobial Activity 被引量:2
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作者 Ahmed Abdel-Azeem Amr A.Nada +2 位作者 Anthonia O’Donovan Vijay Kumar Thakur Amr Elkelish 《Journal of Renewable Materials》 SCIE EI 2020年第2期171-185,共15页
There is an increasing interest in developing nanoparticles with diverse biologic activities.To this end,we prepared 10 to 15 nm silver nanoparticles(AgNP)from native isolates of Trichoderma atroviride.Within this stu... There is an increasing interest in developing nanoparticles with diverse biologic activities.To this end,we prepared 10 to 15 nm silver nanoparticles(AgNP)from native isolates of Trichoderma atroviride.Within this study,endophytic fungi hosted four medicinal plants in Saint Katherine Protectorate,South Sinai,Egypt have been isolated by surface sterilization technique on four isolation media.Ten species,based on their frequency of occurrence,out of twenty recovered taxa were tested for their capability to synthesize extracellular AgNPs.Trichoderma atroviride hosted Chiliadenus montanus was found to be the best candidate for the production of mycogenic AgNPs among all examined species.The mycosynthesized AgNPs were compared with chemically synthesized and characterized using Ultraviolet-visible(UV-vis)spectroscopy,Raman spectroscopy,X-ray diffraction(XRD)and high-resolution transmission electron microscopy(HRTEM)techniques.The HRTEM result showed the distribution of spherical AgNPs ranging from 10 to 15 nm.Trichoderma atroviride isolate was subjected to sequencing for confirmation of phenotypic identification.The internal transcribed spacer(ITS)1-5.8 s-ITS2 rDNA sequences obtained were compared with those deposited in the GenBank Database and registered with accession number MH283876 in the NCBI Database.Antibacterial,anticandidal and antifungal effects of chemically and mycosynthesized AgNPs were examined at various concentrations in vitro against six pathogenic bacteria and 4 pathogenic fungi by agar well diffusion technique.Standard antibiotics;Gentamicin,Amoxicillin,Clotrimazole,and Nystatin at 5μg/disk were taken as positive controls,while 5%DMSO was used as the negative control.Our data revealed that the application of mycogenic AgNPs at a concentration of 100 ppm resulted in maximum inhibition of pathogenic bacteria and fungi.These data suggest that AgNPs from native isolates of Trichoderma atroviride(MH283876)offer a source of rapid synthesis of eco-friendly,economical biomaterials that show antimicrobial 展开更多
关键词 ANTIMICROBIAL endobionts mycogenic AgNPS Saint Katherine protectorate
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黑龙江省保护地厚皮甜瓜引种比较试验 被引量:1
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作者 王喜庆 贾云鹤 尤海波 《中国林副特产》 2012年第4期17-18,共2页
筛选出适合黑龙江省栽培的优良厚皮甜瓜品种。以厚皮甜瓜品种伊丽莎白为对照品种,引进了6个厚皮甜瓜品种进行栽培适应性试验,经过3年试验,调查分析不同品种的生物学特性、植物学特性、产量和品质等性状。试验表明:特异性厚皮甜瓜品种风... 筛选出适合黑龙江省栽培的优良厚皮甜瓜品种。以厚皮甜瓜品种伊丽莎白为对照品种,引进了6个厚皮甜瓜品种进行栽培适应性试验,经过3年试验,调查分析不同品种的生物学特性、植物学特性、产量和品质等性状。试验表明:特异性厚皮甜瓜品种风味4号在试验点的总体表现优良,它生育期适中、比较早熟;生长势强,坐瓜较早;产量高、品质优良、风味独特、抗病性好;综合性状优于对照品种伊丽莎白和其他品种,比较适合在黑龙江地区棚室栽培。 展开更多
关键词 厚皮甜瓜 保护地 品种比较
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护国公政体的权力结构与议会的改良尝试 被引量:1
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作者 陆连超 《河北师范大学学报(哲学社会科学版)》 CSSCI 北大核心 2012年第6期84-89,共6页
奥利弗.克伦威尔所建立的护国公政体往往被视为独裁体制。其实,克伦威尔不是狂热的独裁者,护国公政体是基于相互制衡理念的政治体制。议会为了使这个政体更符合公众的宪政认知,对其进行了积极的改良尝试,同时议会的一些激进举措也破坏... 奥利弗.克伦威尔所建立的护国公政体往往被视为独裁体制。其实,克伦威尔不是狂热的独裁者,护国公政体是基于相互制衡理念的政治体制。议会为了使这个政体更符合公众的宪政认知,对其进行了积极的改良尝试,同时议会的一些激进举措也破坏了这个政体原本脆弱的力量平衡。 展开更多
关键词 奥利弗·克伦威尔 护国公政体 议会 改良 平衡
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黑龙江省紫苏保护地种植技术 被引量:1
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作者 魏国江 王晓飞 +4 位作者 肖宇 赵伟华 崔海波 郭梦桥 刘淑霞 《黑龙江农业科学》 2018年第7期163-165,共3页
紫苏是我国传统的药用作物,近年来健康紫苏食品的开发迅速。为提高紫苏产量、质量及社会和经济效益,在紫苏保护地采用先进的栽培技术,介绍了紫苏棚室选择、品种选择、整地措施、合理施肥、种子处理、合理群体密度、病虫草害防治和合理... 紫苏是我国传统的药用作物,近年来健康紫苏食品的开发迅速。为提高紫苏产量、质量及社会和经济效益,在紫苏保护地采用先进的栽培技术,介绍了紫苏棚室选择、品种选择、整地措施、合理施肥、种子处理、合理群体密度、病虫草害防治和合理收获技术等,以促进棚室紫苏丰产丰收。 展开更多
关键词 紫苏 保护地 种植技术
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17世纪英国护国主政权的舆论宣传
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作者 刘淑青 梁洁 《聊城大学学报(社会科学版)》 2022年第5期63-69,共7页
英国自护国主统治建立之日起,克伦威尔及其政权就遭到了保王党、共和派、宗教极端派的舆论攻击。为维护统治的合法性,政权借用传统的封建君主制话语与文化符号进行舆论宣传。这种舆论宣传策略不仅未能起到巩固统治的目的,反而使护国主... 英国自护国主统治建立之日起,克伦威尔及其政权就遭到了保王党、共和派、宗教极端派的舆论攻击。为维护统治的合法性,政权借用传统的封建君主制话语与文化符号进行舆论宣传。这种舆论宣传策略不仅未能起到巩固统治的目的,反而使护国主及其政权遭到舆论攻击,在公众中造成对护国主政权的负面认知,他们认为护国主就是篡夺王位、非法的专制君主。同时对王权文化的借用,促使它在17世纪50年代出现复兴,在大众想象中保持着一定的活力,这为斯图亚特王朝复辟铺平了道路。 展开更多
关键词 英国 克伦威尔 护国主 舆论
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Reorganizing the Local Boy Scouts Associations in the Northern Province of the Gold Coast Colony
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作者 Doris Susannah Essah 《Cultural and Religious Studies》 2018年第7期417-425,共9页
Imperialist Robert Baden-Powell’s Boy Scouts Association started in the Gold Coast Colony during the First World War and schooled boys for nationality during the 1920s.This paper uses archival documents to discuss ho... Imperialist Robert Baden-Powell’s Boy Scouts Association started in the Gold Coast Colony during the First World War and schooled boys for nationality during the 1920s.This paper uses archival documents to discuss how Chief Scout Governor Gordon Guggisberg,who was brigadier general during the First World War,reorganized the Boy Scouts Association in the Northern Province of the Northern Territories Protectorate.The scout officers at the Local Boy Scouts Associations had the power to fashion desire but were not supposed to have consequences on political power.As government officers and scout officers they had warrants to work at the government schools at Gambaga,Wa,and Lawra to attain money locally for kits to instruct and invent the identity,customs and nationalist categories of schoolboys performing the British Empire. 展开更多
关键词 reorganizing the NORTHERN PROVINCE LOCAL Boy Scouts Association the NORTHERN TERRITORIES protectorate of the GOLD Coast Colony Governor GORDON Guggisberg imperialist Robert Baden-Powell
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岭峰自然保护区昆虫区系特点分析
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作者 王雪松 许铁军 魏力 《林业勘查设计》 2011年第4期61-64,共4页
介绍了岭峰自然保护区内常见的昆虫种类有225种,隶属35科、5个目,所有研究标本均保存在岭峰自然保护区标本室。
关键词 岭峰 保护区 昆虫 区系
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Tuva, April 1914: Incorporation as a Russian Protectorate
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作者 Sureyya Yigit 《International Relations and Diplomacy》 2020年第7期281-289,共9页
Scholarly narratives concerning Tuva becoming a protectorate of Czarist Russia tend to contextualise this action within Russia’s rivalry with China.The 1911 Chinese Revolution provided an opportunity to annex Tuvan t... Scholarly narratives concerning Tuva becoming a protectorate of Czarist Russia tend to contextualise this action within Russia’s rivalry with China.The 1911 Chinese Revolution provided an opportunity to annex Tuvan territory,culminating in Tuva becoming the final territorial expansion of the Empire before the Bolshevik Revolution.This research showcases that the Tuvan people were intent on much closer relations with newly independent Mongolia.The author argues that the Tuvan people belonging to the Turkic family of nations shared important values with and identified much more closely with Mongolia than Russia due to their common religion:Buddhism.The author stresses the fact that the increasing presence of Russians in Tuva in the mid 19th century resulted in the acknowledgement of two highly unfamiliar cultures and viewpoints.Utilising primary sources this work sheds light on the debates and choices Russia faced concerning Tuva and the opposition maintained by the new Mongol entity intent on unifying under its auspices peoples which were considered very close if not the same.This research highlights the Tuvan predicament as being located in more of a triangular contest than what is usually presented as a bilateral power struggle. 展开更多
关键词 TUVA Mongolia RUSSIA BUDDHISM protectorate
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浅议自然生态自治保护区的建立
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作者 李姜黎 陈曦 《吉林农业科技学院学报》 2011年第2期30-32,共3页
建立自然生态自治保护区,完善监督、管理及法律相关体制,制定适合于自治保护区的一套政策,以期从根本上改变自然生态保护区逐渐遭到破坏的局面,使保护区回归到原生态面貌。
关键词 自然生态 自治 保护区 管理
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论人权国际保护与国家主权的关系
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作者 李鸿渊 《襄樊职业技术学院学报》 2005年第2期83-85,共3页
人权的国际保护是人权保护的发展趋势,国家主权是人权国内保护的前提,人权的国际保护和人权的国内保护具有一致性。国家主权具有独立性,不能借口人权国际保护侵犯其他国家主权。
关键词 人权 国家保护 国家主权
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烟台市蔬菜保护地土壤肥力状况
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作者 隋好林 于杰美 王国辉 《湖北农业科学》 北大核心 2011年第22期4576-4578,共3页
对烟台市蔬菜保护地土壤的测定分析表明,烟台市各区(市)蔬菜保护地土壤有机质含量较低,土壤速效氮和速效钾含量也较低,土壤速效磷含量较高,土壤有不同程度的酸化,有少量的轻盐渍化土壤,基本属非盐渍化土壤;日光温室土壤的养分优于大、... 对烟台市蔬菜保护地土壤的测定分析表明,烟台市各区(市)蔬菜保护地土壤有机质含量较低,土壤速效氮和速效钾含量也较低,土壤速效磷含量较高,土壤有不同程度的酸化,有少量的轻盐渍化土壤,基本属非盐渍化土壤;日光温室土壤的养分优于大、中、小棚,低棚龄的日光温室内土壤速效氮、磷、钾含量较低,棚龄10年以上的日光温室内,土壤速效氮和速效钾含量中度积累,速效磷高度富积;随着日光温室种植年限的增加,日光温室土壤有机质含量明显增加,土壤pH有下降的趋势,土壤酸化程度加重,土壤轻盐渍化现象明显。 展开更多
关键词 蔬菜 保护地 土壤肥力 烟台市
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The Tamale Local Boy Scouts Association in the Northern Territories Protectorate in the 1920s
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作者 Doris S.Essah 《Cultural and Religious Studies》 2018年第6期367-375,共9页
In 1907,military leader Robert Baden-Powell started the Boy Scouts Association in England as the British colonial government officers instituted Tamale village as the administrative centre of the Northern Territories ... In 1907,military leader Robert Baden-Powell started the Boy Scouts Association in England as the British colonial government officers instituted Tamale village as the administrative centre of the Northern Territories Protectorate.Sam Yarney worked with Frank Collyer the European bank cashier and scoutmaster who started the Boy Scouts in the Gold Coast Colony in 1914,the year the First World War started.In 1922,Governor Gordon Guggisberg,who was brigadier general during the war was the chief scout.He reorganized the Local Boy Scouts Association in the Tamale Government School that received select boys from various schools in the Northern Territories Protectorate.The schoolboys excelled in the Standard VII and Civil Service Examinations to work with the government institutions and train as teachers and telegraphists.Arthur James Philbrick the chief scout commissioner of the Northern Territories employed Yarney as the assistant scout commissioner in the Southern Province to take on the staff of the reorganized Tamale Local Boy Scouts Association and register the 1st Tamale Troop.The scout officers subscribed to a Scout Fund to buy kit,for the schoolboys who passed the Tenderfoot Tests to buy uniforms and perform at events. 展开更多
关键词 LOCAL BOY Scouts ASSOCIATION 1920s uniforms Tamale Government School Northern TERRITORIES protectorate Gold COAST COLONY
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A Case for the Modifiability of the San Francisco Peace Treaty: Examining the Varying Positions of the U.S. and Britain Over South Korean Participation
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作者 Yi Tae-Jin 《Cultural and Religious Studies》 2020年第2期75-91,共17页
Through a detailed analysis and documentation of relevant U.S.foreign relations and other official documents of the period around the Korean War,this paper aims to prove that in the early negotiation process of the 19... Through a detailed analysis and documentation of relevant U.S.foreign relations and other official documents of the period around the Korean War,this paper aims to prove that in the early negotiation process of the 1951 San Francisco peace treaty,the United States maintained that South Korea should participate in signing the treaty and that the U.S.changed its position because of the resilient British opposition to South Korean participation,which in turn was motivated strongly by the British concern over its strategic interests in East Asia and its diplomatic relations with the newly communized China.In particular,the Chinese intervention in the Korean War and the communist recapture of Seoul provided the impetus for this shift in the U.S.position that led to the exclusion of South Korea from the treaty.Because the substance of the San Francisco peace treaty was dictated by the exigencies under the Korean War and the Cold War and lacks the“Grotian spirit of international law”underlying the founding of the League of Nations and the United Nations,the San Francisco peace treaty does not contain sufficient merit to be worthy of permanent compliance,which leaves open the possibility of modification in the future. 展开更多
关键词 the San Francisco Peace TREATY the US-Japan security TREATY British OBJECTION to South KOREAN PARTICIPATION COMMUNIST China the KOREAN WAR the Cold WAR the 1905 protectorate TREATY Grotian spirit of international law
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论李鸿章在中法战争前夕的务实外交——以李宝谈判为例
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作者 李志亮 《杨凌职业技术学院学报》 2009年第2期72-74,78,共4页
中法双方由越南问题而引发的战争是中国近代史上一次有相当影响的战争。李鸿章作为晚清重臣直接参与了这场战争。在与宝海的交涉中,李鸿章不再拘泥于中越宗藩关系之虚名,而是从国家安全利益出发,与法国划定鸿沟,防止法国以越南为跳板侵... 中法双方由越南问题而引发的战争是中国近代史上一次有相当影响的战争。李鸿章作为晚清重臣直接参与了这场战争。在与宝海的交涉中,李鸿章不再拘泥于中越宗藩关系之虚名,而是从国家安全利益出发,与法国划定鸿沟,防止法国以越南为跳板侵略中国西南。可以说,《李宝协议》的签订,实为李鸿章务实外交的成果。 展开更多
关键词 中越宗藩关系 李宝谈判 保护国 务实外交
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浅析不同保护区景观的生物多样性保护现状
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作者 李娜 《中文科技期刊数据库(文摘版)自然科学》 2015年第3期231-232,共2页
生物多样性是宝贵的自然遗产,丰富的生物多样性对人类的生存、社会的发展有着举足轻重的作用,然而随着人类对自然需求的不断增加,生物多样性已经处于岌岌可危的地位。为此,简要分析不同保护区景观要素下的生物多样性现状,综合问题的发... 生物多样性是宝贵的自然遗产,丰富的生物多样性对人类的生存、社会的发展有着举足轻重的作用,然而随着人类对自然需求的不断增加,生物多样性已经处于岌岌可危的地位。为此,简要分析不同保护区景观要素下的生物多样性现状,综合问题的发生原因进行归类,并提出保护对策。 展开更多
关键词 生物多样性
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The San Francisco Peace Treaty and the Problems Regarding Japan’s Exemption from Blame for the Colonization of Korea
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作者 YI Tae-Jin 《Cultural and Religious Studies》 2018年第1期33-50,共18页
The 1951 San Francisco Peace Treaty was the one and only international opportunity that would have allowed demanding for Japan’s responsibility of the colonization of Korea.However,the United States did not demand of... The 1951 San Francisco Peace Treaty was the one and only international opportunity that would have allowed demanding for Japan’s responsibility of the colonization of Korea.However,the United States did not demand of such to be done.Soon,Korea and Japan resumed their diplomatic relationship and had their first summit in 1952.After numerous negotiations,finally in 1965,the“Korea-Japan Treaty”was agreed upon.Even in this treaty,the interpretation of the colonization was different for both countries and ultimately resulted as an unresolved issue.This is because of the Japanese dependence to the San Francisco Peace Treaty.On the other hand,the League of Nations,founded in 1920,believed that the systematization of international law was vital to keeping international peace.Therefore,they put much effort in and successfully carried out the codification of international law.The“Report on the law of Treaties”which was completed in 1935,noted that the“1905 Protectorate Treaty”,which was the ultimate treaty that led to Korea being annexed by the Japanese,was one of the three treaties that had no effective standing.This decision was carried out to the International Law Commission of the United Nations in 1963 and became a Resolution after being submitted to the General Assembly in the end of the same year.Using the decisions of the League of Nations and the United Nations as evidence,this paper critically reviews the San Francisco Peace Treaty’s lack of reviewing the Japanese responsibility of the colonization of Korea. 展开更多
关键词 protectorate TREATY of November 1905 International PEACE activists in 1900s The Second Hague PEACE Conference William T.Stead FRANCIS Rey James Garner Manley O.Hudson Harvard Draft Convention on the Law of Treaties
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北戴河鸟类生境分析及保护对策
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作者 孔繁德 张明顺 《中国环境管理干部学院学报》 CAS 1999年第2期42-44,共3页
北戴河及相邻地区的鸟类种数繁多,约有409种,其中属国家一类保护鸟类的有12种,二类保护鸟类的有49种。分析其原因,一是北戴河位于中国东部候鸟迁徙的停歇地;二是生境复杂多样,环境质量优良。为保护鸟类及其生境,应制定并实施相应的地方... 北戴河及相邻地区的鸟类种数繁多,约有409种,其中属国家一类保护鸟类的有12种,二类保护鸟类的有49种。分析其原因,一是北戴河位于中国东部候鸟迁徙的停歇地;二是生境复杂多样,环境质量优良。为保护鸟类及其生境,应制定并实施相应的地方法规和经济技术政策,建立并完善自然保护区,开展宣传教育,动员公众参与。 展开更多
关键词 鸟类 多样性 生境 迁徙 停歇地 保护
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