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| 1 | 东北红豆杉种群的回归成效及影响因素显示文摘【目的】回归是一种濒危物种保护与种群恢复的重要方法。本研究以极小种群物种东北红豆杉为研究对象,选择3种不同的林型以及两组不同苗龄的东北红豆杉幼苗开展野外回归试验,研究适宜东北红豆杉回归林型以及回归过程中幼苗生长及存活的主要影响因素,以期为东北红豆杉回归保护提供科学依据。【方法】选择杨桦林、红松云冷杉林和红松紫椴林3种林型作为回归试验地,以1~2年生和4~5年生东北红豆杉实生幼苗作为试验材料,移栽后调查土壤因子、地形因子等指标,逐月调查幼苗存活率、苗高、地径、冠幅等指标。对幼苗各生长指标进行差异性显著分析和多重比较,通过灰色关联分析等方法研究回归幼苗生长过程中的影响因子。【结果】东北红豆杉回归幼苗当年存活率达86%以上,地径、苗高、冠幅均有所增长,除1~2年生东北红豆杉幼苗苗高生长量外,各林型中东北红豆杉幼苗生长指标生长量均无显著差异,红松紫椴林的1~2年生东北红豆杉幼苗苗高生长量显著高于杨桦林和红松云冷杉林。由于越冬期间,4~5年生东北红豆杉幼苗受到狍啃食,存活率显著下降且长势极差;1~2年生幼苗受长时间的低温胁迫生长状况也受到一定影响。东北红豆杉回归幼苗的存活和生长受到多种环境因子的影响,关联度最大的是林型,其次是坡向、坡度和郁闭度,土壤化学性质指标的关联度较小。【结论】4~5年生幼苗因受动物啃食而回归效果不良;1~2年生幼苗适应杨桦林、红松云冷杉林和红松紫椴林下这3种生境,回归最适宜的林型是红松紫椴林;林型、坡向、坡度、光照是影响东北红豆杉回归的主要环境因子。 | 徐超 龙婷 吴鑫磊 陈杰 梁艳君 李景文 | 2020 | 北京林业大学学报2020，42，8： | 6 |
| 2 | Conserving plants within and beyond protected areas-still problematic and future uncertain显示文摘Against a background of continuing loss of biodiversity, it is argued that for the successful conservation of threatened plant species we need to ensure the more effective integration of the various conservation actions employed, clarify the wording of the CBD targets and provide clearer operational guidance as to how they are to be implemented and their implementation monitored. The role and effectiveness of protected areas in conserving biodiversity and in particular plant species in situ are discussed as are recent proposals for a massive increase of their extent. The need for much greater effort and investment in the conservation or protection of threatened species outside protected areas where most plant diversity occurs is highlighted. The difficulties involved in implementing effective in situ conservation of plant diversity both at an area-and species/population-based level are discussed. The widespread neglect of species recovery for plants is noted and the desirability of making a clearer distinction between species recovery and reintroduction is emphasized. Key messages from a global overview of species recovery are outlined and recommendations made, including the desirability of each country preparing a national species recovery strategy. The projected impacts of global change on protected areas and on species conservation and recovery, and ways of addressing them are discussed. | Vernon H.Heywood | 2019 | Plant Diversity2019，41，2： | 2 |
| 3 | Recovering threatened plant species and their habitats: The need for integrated action显示文摘As an introduction to the Special Issue on the restoration of threatened plant species and their habitats,this editorial shows how the various papers in the issue address the range of in situ interventions involved in species population management and restoration of their habitat, together with examples of case studies implementing these actions. It stresses the need for integrating these various interventions.It highlights the importance of protected areas in providing a degree of protection for threatened species but also the need to complement this with actions at the species level to ensure the effective conservation and long term persistence of these species. It emphasizes that ecological restoration is a complement to, not a substitute for conservation, and that the balance of effort and allocation of resources between them is a key issue. | Vernon H.Heywood | 2019 | Plant Diversity2019，41，2： | 0 |
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