英语论文网

留学生硕士论文 英国论文 日语论文 澳洲论文 Turnitin剽窃检测 英语论文发表 留学中国 欧美文学特区 论文寄售中心 论文翻译中心

Bussiness ManagementMBAstrategyHuman ResourceMarketingHospitalityE-commerceInternational Tradingproject managementmedia managementLogisticsFinanceAccountingadvertisingLawBusiness LawEducationEconomicsBusiness Reportbusiness planresearch proposal

英语论文题目英语教学英语论文商务英语英语论文格式商务英语翻译广告英语商务英语商务英语教学英语翻译论文英美文学英语语言学文化交流中西方文化差异英语论文范文英语论文开题报告初中英语教学英语论文文献综述英语论文参考文献

ResumeRecommendation LetterMotivation LetterPSapplication letterMBA essayBusiness Letteradmission letter Offer letter

澳大利亚论文英国论文加拿大论文芬兰论文瑞典论文澳洲论文新西兰论文法国论文香港论文挪威论文美国论文泰国论文马来西亚论文台湾论文新加坡论文荷兰论文南非论文西班牙论文爱尔兰论文

小学英语教学初中英语教学英语语法高中英语教学大学英语教学听力口语英语阅读英语词汇学英语素质教育英语教育毕业英语教学法

英语论文开题报告英语毕业论文写作指导英语论文写作笔记handbook英语论文提纲英语论文参考文献英语论文文献综述Research Proposal代写留学论文代写留学作业代写Essay论文英语摘要英语论文任务书英语论文格式专业名词turnitin抄袭检查

temcet听力雅思考试托福考试GMATGRE职称英语理工卫生职称英语综合职称英语职称英语

经贸英语论文题目旅游英语论文题目大学英语论文题目中学英语论文题目小学英语论文题目英语文学论文题目英语教学论文题目英语语言学论文题目委婉语论文题目商务英语论文题目最新英语论文题目英语翻译论文题目英语跨文化论文题目

日本文学日本语言学商务日语日本历史日本经济怎样写日语论文日语论文写作格式日语教学日本社会文化日语开题报告日语论文选题

职称英语理工完形填空历年试题模拟试题补全短文概括大意词汇指导阅读理解例题习题卫生职称英语词汇指导完形填空概括大意历年试题阅读理解补全短文模拟试题例题习题综合职称英语完形填空历年试题模拟试题例题习题词汇指导阅读理解补全短文概括大意

商务英语翻译论文广告英语商务英语商务英语教学

无忧论文网

联系方式

多伦多论文-一枝黄花的入侵生物学研究

论文作者:英语论文网论文属性:职称论文 Scholarship Papers登出时间:2012-02-16编辑:kalila点击率:1338

论文字数:5554论文编号:org201202161018141820语种:英语论文 English地区:加拿大价格:免费论文

关键词:加拿大一枝黄花入侵机制人工去叶根茎萌发遗传多样性化感活性光合作用ISSR种群建立

摘要:多伦多论文-一枝黄花的入侵生物学研究-越来越多的研究表明,外来植物的入侵已对入侵生态系统的生物多样性产 生了深刻的影响。然而并不是所有的外来植物都能成为入侵种,其中只有一小部 分能够成功入侵。因此,研究外来植物成功入侵的内在机制是入侵生态学中的关 键问题之一。一个物种能否成功入侵取决于物种本身的生物学特性(如:生长快, 竞争能力强,繁殖方式多样,繁殖能力高,扩散能力强,具有快速进化的特性等) 以及环境的可入侵性(如缺乏天敌,具有空生态位,气候条件与其原产地相似, 人类活动的干扰强度大等)。

多伦多论文-一枝黄花的入侵生物学研究-Invasion Biology of Solidago Canadensis-More and more studies show that invasion of alien plants has caused severe impacts on native biodiversity. However, not all of the alien plants are able to become invasive, only a small part of them may successfully invade native ecosystems. Therefore, it is very important to study mechanisms underlying successful invasion of alien plants. Biological invasion depends on both of the high invasiveness of the invader (such as rapid growth from seedling to sexual maturity, high competitive ability, rapid evolutionary changes, adaptation to environmental stress and high tolerance to environmental heterogeneity) and high invisibility of ecosystems (such as empty niches, high level of disturbance, without natural enemy, similar environmental conditions with native distribution area of the invader). Studies on compensationary growth of invasive plants, which are subjected to different intensities of leaf-eating, in different levels of soil fertility are very important for us to determine the suitable density of its natural enemy population. Studies of genetic diversity of invasive plants would be useful for understanding their genetic differentiation in novel habitats, and the genetic mechanisms underlying their high adaptation to novel habitats. Furthermore, it can provide genetic proofs for management practices of the invaders. Studies on capacity of asexual reproduction of invasive species under disturbed conditions can help us to understand their establishment potential. 

http://www.51lunwen.org/canada/  

Studies on allelopathic activity of invasive plants on native plants grown in the habitats they invade should be valuable for understanding the mechanisms in chemical ecology that alien plants can successfully invade a novel ecosystem. Canadian goldenrod (Solidago canadensis) is a perennial rhizomatic plant native to North America; it was introduced into China as ornamental plant in 1935, and has become one of the detrimental weeds in Shanghai. The purpose of the present study is to investigate the mechanisms underling its successful invasion, and try to find some effective ways for its control. This work included the following four aspects: effects of soil fertility and artificial defoliation on the growth of S. Canadensis; establishment; allelopathic potential; genetic diversity of S. canadebsis. The experiments are summarized as following: 1. Study on effects of simulated herbivory feeding on growth of S. canadensis is favorable to the practice in its control. Our field investigation showed that growth of the goldenrod seemed flourish although its leaves were eaten with different patterns and different intensities by insects. To understand the effects of feeding intensities, feeding patterns, and soil fertility levels on compensationary growth of the goldenrod, 4 we simulated the intensities and patterns of herbivore feeding (apex clipping with intensities of 25%, 50%, and 100%; and 25% of defoliation with apex, edge, small and large perforation removal). The artificial defoilation experiments showed that 25% of defoliation significantly increased its photosynthesis and its growth; especially at hig

论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

共 1/1 页首页上一页1下一页尾页

相关文章

    英国英国 澳大利亚澳大利亚 美国美国 加拿大加拿大 新西兰新西兰 新加坡新加坡 香港香港 日本日本 韩国韩国 法国法国 德国德国 爱尔兰爱尔兰 瑞士瑞士 荷兰荷兰 俄罗斯俄罗斯 西班牙西班牙 马来西亚马来西亚 南非南非

       Europe (24-hours)
       EN:13917206902
       china (24-hours)
       CN:13917206902
    
    在线客服团队
        全天候24小时在线客服
          QQ:949925041 
      

    微信公众订阅号