共查询到16条相似文献,搜索用时 46 毫秒
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对国内亚高山退化生态系统及植被恢复的研究进展进行了综述。包括国内学者对亚高山退化生态系统特征、干扰因子和作用机理、退化生态系统的天然更新即限制因素和植被恢复等方面的研究情况,提出了现有研究中存在的一些问题,并对亚高山退化生态系统更深入系统的研究提供建议和依据。 相似文献
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针对20世纪70年代以来,香格里拉县森林覆被率不断下降,亚高山针叶林迅速减少,无林地面积大量增加的趋势及森林植被恢复的紧迫性,从三个方面,论述了造林地的形成、类型划分及森林植被恢复对策。第一,系统地分析了香格里拉亚高山针叶树种及森林类型多样性,叙述了21个亚高山针叶林类型及其主要特点;根据植被演替理论,论述了亚高山针叶林经采伐、森林火灾干扰后,退化林地形成及演变趋势。第二,运用群落分类法,根据造林地建群种和亚建群种提出了造林地类型组和类型的两级分类方法,并运用表格叙述了七个类型组和20个类型的主要特征。第三,提出了森林植被恢复的对策建议。 相似文献
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辽西地区十年九旱,恶劣的生态环境已成为制约当地社会经济发展的首要因素。采用科学的方法恢复植被,是摆脱生态困境的根本选择。在详尽分析困难立地植被恢复中存在的主要问题的基础上,就本地区植被恢复模式、抗旱保水技术措施、加强抚育管理和科技支撑等方面做出系统阐述,特别强调以自然之力恢复自然的重要性。 相似文献
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伊春是我国重点国有林区,这里曾是以红松、云冷杉为优势树种的针阔混交森林植物群落,蓄藏着丰富的森林植被资源。但由于以往的过量采伐,以及粗放式的生产管理模式,使得该地区森林植被资源受到了严重破坏。而大力营造抗逆性树种、有效保护和科学培育好现有的森林植被资源、加大封禁管护力度,则是加快该地区生态环境脆弱地带植被的恢复进程,促进生态、经济和社会效益协调发展的有效途径。 相似文献
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幕府山地区劣质地带植被恢复研究和探索 总被引:1,自引:0,他引:1
幕府山地区位于南京主城区北面,位于南京长江大桥和长江二桥之间,是规划建设中的南京大江风光带的重要组成部分,融山、水、城、林为一体,是最能代表南京江滨城市风貌的窗口地区。核心保护区西至中央北路,东至和燕路,南到纬一路,北以江边为界,面积为9.36Km2,其中山体面积约6.4Km2。 幕府山地区综合整治工程,是南京市近年来的重点工程,1999年起,南京市人民政府下大力气,关停了幕府山地区的8家采石场,并着手进行该地区的植被恢复工作。 一、幕府山地区现状调查分析幕府山临江而立,东西长约6Km,山岗高低起伏,现存最… 相似文献
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以川北地震灾区不同植被恢复模式(慈竹林、茶树林、喜树林、柳杉林和农耕地)为对象,研究土壤抗蚀性,并探讨土壤有机质与抗蚀性指标之间的关系。结果表明:植被恢复后水稳性团聚体平均重量直径、结构性颗粒指数、团聚状况和团聚度增加,土壤结构体破坏率、不稳定团粒指数、分散率、侵蚀系数和受蚀性指数降低;不同植被恢复模式土壤抗蚀性综合主成分值呈现出慈竹林〉茶树林〉喜树林〉柳杉林〉农耕地的规律;土壤有机质与绝大多数土壤抗蚀性指标呈显著相关。说明土壤有机质能较好地表征土壤抗蚀性,慈竹林对于提高研究区土壤抗蚀性具有重要的作用和意义。 相似文献
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南方岩溶区植被自然演替恢复研究综述 总被引:2,自引:0,他引:2
我国岩溶区绝大部分分布在南方。植被的自然演替恢复是岩溶区生态重建的主要方式。随着自然演替的进行,土壤环境特征、土壤养分特征及土壤种子库等产生相应的变化。而岩溶植被的顶极群落特征和群落演替特征,包括盖度、结构、物种多样性、生物量、分布格局、演替方向都有其自身的特殊性。 相似文献
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Rafael M. Navarro-Cerrillo Daniel M. Griffith María José Ramírez-SoriaWilliam Pariona Duncan Golicher Guillermo Palacios 《Forest Ecology and Management》2011,262(12):2271-2280
To insure adequate regeneration and future timber yields of mahogany (Swietenia macrophylla King), many logged forests will have to be restocked through enrichment planting and managed using silvicultural techniques that maintain this species’ long-term survival and growth. This study compared the effects of planting method and two silvicultural treatments on the survival and growth of mahogany seedlings in logging gaps in Bolivia. We tested the hypotheses that survival and growth will be higher among transplanted seedlings than seedlings established from sown seeds and higher in silvicultural treatments that reduce competing vegetation and increase light. The first silvicultural treatment consisted of gaps logged 6 months prior to planting, gaps logged just prior to planting, and gaps treated with herbicide prior to planting. The second treatment, applied 12 months after planting, consisted of manual vegetation cleaning around mahogany seedlings in half of the gaps. The first hypothesis was supported in terms of initial seedling growth but not survival, which was similar between planting methods during the 12-92 months after planting. Transplanted seedlings grew significantly faster than those established from sown seeds during the first year, but this growth advantage disappeared by the second year. Although transplants were 84 cm taller than seed-sown seedlings by the end of the study, this height gain was probably not worth the cost of growing and transplanting seedlings. The second hypothesis was supported in terms of both survival and growth. A significantly greater proportion of seedlings survived in herbicide (62%) compared to 6-month-old (46%) and recent gaps (18%) and in cleaned (51%) versus control gaps (39%). Seedlings initially grew faster in herbicide and recent gaps than in 6-month-old gaps. These differences among silvicultural treatments were largely explained by canopy cover, which, throughout the study, was at least 14% lower in herbicide gaps and 9% lower in cleaned gaps relative to their respective alternatives. By 64 months growth diminished to near zero and no longer differed among gap treatments, despite lower canopy cover in herbicide gaps. By 92 months, saplings in herbicide gaps were only 145 and 77 cm taller than those in recent and 6-month-old gaps, respectively. To maximize survival and growth of mahogany seedlings in logging gaps while minimizing costs, silvicultural strategies should focus on direct seed sowing and appropriately timed interventions (i.e. manual cleaning) to control competing vegetation. 相似文献