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珍贵壳斗科树种种苗繁殖研究 总被引:4,自引:0,他引:4
选择壳斗科中的主要用材树种、水土保持树种和干瘠裸露地绿化树种共15种,对这些树种的开花与结实期、采种与种子处理和贮藏、果实与种子形态、育苗方法、幼苗形态特征等做了深入的研究,取得较为显的成果。 相似文献
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广东省珍贵树种发展现状与对策探讨 总被引:4,自引:2,他引:2
文章从探讨广东省珍贵树种资源现状出发,分析了广东珍贵树种发展存在的问题与发展潜力,并从树种选择、科学规划、科技支撑、种苗供应、政策保障、组织管理等方面提出了广东省珍贵树种发展对策,为珍贵树种在广东大力推广提供基本理论依据。 相似文献
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河南省珍贵用材树种的现状、问题与发展对策 总被引:2,自引:0,他引:2
通过阐述河南省珍贵用材树种的发展现状,分析了当前珍贵树种培育中存在的问题,提出了今后河南省发展珍贵树种的对策和建议。 相似文献
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通过对屯昌县在"绿化宝岛"行动中因地制宜发展和利用珍贵乡土树种的情况的调研,分析了在"绿化宝岛"行动中因地制宜发展和利用珍贵乡土树种中存在的问题,提出了解决的对策。 相似文献
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阿勒泰地区平原珍贵树种资源保护与发展 总被引:1,自引:0,他引:1
新疆阿勒泰地处欧亚大陆腹地,是一个生态环境脆弱、资源相对丰富、经济相对落后的贫困地区。发源于阿尔泰山的额尔齐斯河,是新疆第二大河流,也是我国唯一流向北冰洋的国际性河流,还是阿尔泰地区的生命河流。额尔齐斯河两岸天然形成的河谷林,虽历经磨难伤痕累累,但一直是阿尔泰地区生态环境改善、社会文化进步和经济持续发展的根本保证。由于五六十年代过度采伐及毁林开荒,额尔齐斯河流域森林资源结构极不合理,部分河段目前可天然下种的母树已寥寥无几,珍贵用材树种基因将会消失,生态环境愈加恶化。保护和恢复额尔齐斯河流域的珍贵… 相似文献
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面对日益激烈的市场竞争,湖南花卉苗木产业的发展面临严峻的挑战。要实现湖南花卉苗木产业的可持续发展,产业定位应是优先发展观赏苗木产品,并将产业优先布局于长株潭地区;战略措施应包括建设绿化苗木生产和交易中心,调整产品结构和区域布局,实施科教兴花、商品基地建设、市场体系建设等三大工程,强化多元化投入、科技推广、社会化服务、营销信息网络体系等四大体系。 相似文献
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宋自力 《绿色中国(A版)》2003,(8):60-61
湖南是我国南方重点林区,林业用地面积971.97万hm2,森林覆盖率53.13%,森林蓄积量3.1亿m3。近年来,随着改革的不断深入和市场经济的发展,非公有制种苗花木业迅速崛起,成为农村经济新的增长点,显示出旺盛的生命力和强劲的发展势头。现状湖南省非公有制种苗花木业是从20世纪90年代中期发展起来的,从一家一户、星星点点到一乡一镇、集中连片,发展步伐不断加快,发展领域不断拓宽,发展模式不断创新。据统计,全省现有非公有制种苗花木生产经营企业300多家,个体户3万多个,从业人员22万多人,苗木花卉种植面积超过6667hm2(10万亩),大小种苗花木市场168… 相似文献
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黑龙江省主要珍贵阔叶用材林发展策略研究 总被引:1,自引:0,他引:1
通过分析我国珍贵阔叶用材林树种需求现状,以及黄波罗、胡桃楸、水曲柳、蒙古栎四种主要珍贵用材林树种的特点和分布情况,研究黑龙江省培育珍贵阔叶用材林的可行性和适宜性。研究结果表明,因气候条件限制,黑龙江省不适合大规模发展珍贵阔叶用材林,应在张广才岭、老爷岭、万达山脉等东部山区营造针阔混交林。 相似文献
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The objective of this study is to assess drivers and barriers to primary forest fuel (PFF) supply in the wide-stretched South East Europe (SEE) countries and to develop strategies to improve PFF supply involving dozens of stakeholders from different SEE countries. SWOT (strengths, weaknesses, opportunities and threats) analyses were used to evaluate country supply chains. Based on those a regional SWOT analysis was compiled and strategies were developed and evaluated in a participative decision process. Results show that strategies for increasing biomass utilisation are of high relevance in all participating countries. Additionally, strategies for knowledge dissemination are also important. The evaluated regional strategies for the forest fuel sector examined have great potential to improve cooperation, increase efficiency and strengthen competitiveness of PFF based bioenergy production. 相似文献
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Field performance can be predicted by evaluating nursery stock quality, but optimal morphological variables for use in these assessments may vary by species especially under dry Mediterranean conditions. Our objective was to identify initial seedling morphological characteristics that successfully predict field performance of five Mediterranean species (Pinus halepensis, Quercus ilex, Quercus coccifera, Ceratonia silqua and Pistacia lentiscus). Container seedling morphology was evaluated following the nursery phase, and then seedlings were outplanted in the field where field survival was monitored for two successive years. Results indicate that survival can successfully be predicted from seedling initial morphological characteristics for all these species, yet not all the initial characteristics were good predictors. Survival of P. halepensis and Pist. lentiscus seedlings was positively correlated to initial seedling root-collar diameter, total dry weight and Dickson’s quality index, and can be reliably predicted by these variables. In contrast, seedling field survival of the two Mediterranean evergreen oak species was correlated with few initial morphological attributes; initial diameter provided an accurate index to predict second-year outplanting survival for both species while height/diameter was a good survival predictor for Q. coccifera seedlings. For C. siliqua seedlings, seedlings with larger initial diameter and total biomass survive better in the field. Thus, diameter was the common variable that accurately predicted survival for all species, which should be >5 mm for P. halepensis seedlings and >7 mm for the remaining species. 相似文献
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基于生态安全的旅游发展策略 总被引:1,自引:1,他引:0
旅游生态安全是影响旅游业可持续发展的关键因子之一。由于对旅游与环境关系缺乏科学认识,忽视了旅游本身对环境的影响和资源的破坏,引发了旅游资源损害、生态环境系统失调、环境严重污染等系列的生态安全问题。基于旅游生态安全的视角,提出了走出生态旅游的认识误区,旅游资源开发与保护并重,切实搞好旅游环境保护等旅游业可持续发展的措施。 相似文献
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