共查询到20条相似文献，搜索用时 250 毫秒
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以福建省上杭白砂国有林场大梧工区为试验地开展柳窿桉、尾赤桉201-2、尾赤桉184-1、巨桉与赤桉等7个桉树无性系的引种效果试验,旨在筛选适于在当地推广造林的桉树品种。试验结果表明:参试无性系在生长量和抗寒性方面差异显著或极显著。在耐寒性方面,赤桉最好,尾赤桉次之,巨桉第三,柳窿桉最差;生长性状方面,尾赤桉表现最好,赤桉次之,而巨桉、柳窿桉因受冻严重生长量较差。据试验结果建议闽西地区选择赤桉和尾赤桉进行推广造林。 相似文献
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《林业资源管理》2016,(2):93-97
以北抗、08等系列的12种引进速生杨品种为研究对象,调查幼苗期成活率、保存率、胸径、新梢长,运用隶属函数法对12种速生杨幼苗在乌兰布和沙漠东北部的适应性进行综合评价。结果表明:速生杨各品种成活率在84.12%~100%之间,其中成活率较高的为08-01,08-07和北抗16-27;保存率在68.42%~100%之间,较高的为08-07、北抗16-27和08-01;胸径生长量在0.13~1.35cm范围内,较高的为08-09,08-03,08-01;新梢生长量在19.39~103.88cm范围内,较高的为北抗16-27、北抗16-8和08-03。通过隶属函数值进行排序,08-01、北抗16-27和08-09等3种速生杨品种幼苗期在乌兰布和沙漠东北部的生长适应性较好,可以作为该区防护林造林优良品种。 相似文献
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3个沙地造林树种的施肥试验效果 总被引：1，自引：0，他引：1
在达拉特旗东南部沙漠进行的沙柳、沙棘和锦鸡儿生态造林中,通过施用不同肥料试验,研究了不同肥料对3种耐沙树种的造林效果。结果表明,与对照相比,施用农家肥、复合肥、尿素氮肥对3个树种高生长量作用显著：在沙柳造林中,施农家肥比对照提高树高生长量为142.39%,冠幅生长量提高116.36%;施复合肥比对照提高树高生长量88.85%,冠幅提高108.18%;施尿素比对照提高树高生长量为66.85%,冠幅提高73.94%。施肥对沙棘和锦鸡儿的效果也与沙柳相似,均比对照有较显著的提高。农家肥能明显提高沙柳和沙棘造林成活率,农家肥和复合肥能明显提高锦鸡儿造林成活率。施用农家肥是沙地造林较为理想的技术措施。 相似文献
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通过在辽西干旱地区1年生刺槐新造林中开展保水剂应用效果的研究,结果表明保水剂对提高刺槐造林成活率有着明显的作用,保水剂稀释蘸根处理中以1%的效果最好,成活率达到了81.3%,与不施保水剂对照的差异显著;穴施保水剂颗粒的处理中以穴施颗粒剂12～19 g/株的刺槐造林效果最好,成活率达到了90%以上,与不施保水剂的对照差异极显;穴施保水剂胶体的处理中以穴施2～4 kg/株的效果较好,成活率达到了94%以上,差异极显著,穴施2 kg/株处理的成活率最高,达到了97.6%;保水剂稀释液蘸根处理、穴施保水剂颗粒剂处理的年生长量与对照相比差异不明显,相对而言穴施保水剂胶体的处理对刺槐年生长量有比较明显的影响。 相似文献
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森林采伐是森林经营中的一个关键环节。采伐对树木天然更新的影响直接关系到森林的结构、组成及森林的可持续经营。本文以长白山阔叶红松林为研究对象,对择伐5 年后不同作业迹地(集材道、楞场和采伐后林窗)的幼苗更新及灌木、草本的多样性进行研究,并以没有进行采伐干扰的林地作为对照。共设计样地23 块,在各个小样地内调查幼树的种类、树木、高度;灌木和草本植物的种类、树木、高度和盖度,应用SPSS 软件进行一元方差分析。结果表明,择伐作业影响幼苗的更新,灌木和草本的多样性在作业迹地增加,尤其在林隙处的多样性最高。适当采伐能促进幼苗的更新,特别是阔叶树种的更新。集材道对幼苗密度的影响比对幼苗高度的影响大,幼苗密度在集材道上密度最高;采伐作业对针叶树种有严重的影响,在三种作业迹地上针叶树种的密度都比对照低。为了维持森林的结构和组成,在森林收获和楞场的建立时,必须采取科学措施保护针叶树种。此外,采伐林窗和楞场的面积都应该减小。为了确保采伐迹地建群树种的更新,经营中应该在保护生物多样性的前提下,适当控制过于旺盛的灌木和草本层的生长。本研究结果将为采伐后作业迹地的恢复和森林的可持续经营提供科学的依据。图1 表4 参14。 相似文献
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以 1年生美国黑核桃实生苗、嫁接苗和定植 3年的种子树、采穗树为试验材料 ,在生长期喷施不同倍数的OPAL液肥 ,结果表明 :采穗树、种子树平均树高比对照分别提高了 2 6 .13%和4 6 .15 % ;胸径比对照分别提高了 37.36 %和 2 4 .4 8% ;产穗量比对照提高了 2 8.97% ;果实饱满度比对照提高 2 0 .6 8% ;1年生实生苗、嫁接苗平均苗高比对照分别提高 2 8%和 31.82 % ,地径比对照分别提高 18.4 9%和 14 .2 8%。喷施OPAL液肥对美国黑核桃的生长发育有着显著的正效应 相似文献
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杨树在我国分布很广,是人工林主栽品种之一。近年来由于天然林禁伐,木材短缺的问题,营造杨树速生丰产林倍受重视。通过沙地上不同苗龄型造林试验,提出了利用杨树大苗造林,可有效地提高杨树速生丰产林的经济效益,3根2干苗为营造杨树速生丰产林的适宜苗龄。 相似文献
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海滨湿地杨树、柳树新无性系苗期耐盐性研究 总被引：3，自引：0，他引：3
在海滨湿地分别4个盐度梯度，12种杨树、柳树新无性系田间扦插试验结果表明：在苗期，不同杨树、柳树无性系的成活率、保存率、生长量等均与土壤含盐量呈负相关；在出苗期的耐盐能力，1-74杨、1-69杨可达0．241％，35杨为0．188％，J30-16、J35-13、J4-34、J31-17柳为0．089％，其余5个柳树无性系均在0．060％以下；在苗木生长期，其耐盐极限分别为0．343％，0．333％和0．201％。 相似文献
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杨树和柳树均属于杨柳科植物,两者在经济林及绿化行道树上的运用越来越广泛。锈病在杨树和柳树高栽植密度苗圃地和成片用材林的发生极为严重。本研究比较杨树和柳树锈病的发病症状、流行特点及病原菌特征,为该病的防治提供理论和实际指导依据。以川东北地区4区(县)(南充市高坪区和西充县,广安市前锋区和武胜县)患发锈病的杨树和柳树为研究对象,采用流行病学调查和显微观察技术等方法。杨树锈病和柳树锈病大都侵害叶和幼苗,引起树叶早期脱落,幼苗枯萎。但杨树锈病的病原菌为锈菌科栅锈菌属松杨栅锈菌(Melampsora larici-populins),柳树锈病的病原菌为锈菌科栅锈菌属拟鞘锈栅锈菌(Melampsora coleosporioides Diet.)。杨树锈病和柳树锈病虽有共同的发病特征,但在为害症状、病原类型和发生规律方面均有很大的不同。建议在防治时根据寄主的不同选择针对性强的防治方法。 相似文献
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Rapid early growth of tree seedlings is critical to the success of plantation establishment. We investigated the effects of
seedling size (small and large) and container types (small [Lannen 121], medium [Lannen 81] and large [Forestry Tube]) in
the nursery and the effects of mammal browsing after planting on growth of Eucalyptus globulus in Tasmania’s Southern Forests. After planting, seedlings were either exposed to browsing or protected from browsing by wire-mesh
cages until age 6 months. Low browsing pressure resulted in around 20% and 5–10% of foliage being browsed in the large and
small size categories, respectively, between 1 and 3 months after planting the uncaged treatment. 6 months after planting,
height growth increment was lower, and 4 years after planting, mortality was higher in uncaged large than caged large seedling
treatments. Six and twelve months after planting, seedlings raised in Forestry Tube containers had significantly greater height
increment and root collar diameter relative to other treatments. By 4 years after planting, trees of the small seedling treatment
had significantly greater diameter than those of the large seedling treatment, but there was no effect of container type treatment.
Four years after planting there was no effect on diameter growth by browsing of <30% of foliage up to 3 months after planting,
although there was greater incidence of double leaders in trees that had been browsed as seedlings. Small seedlings produced
more growth 4 years after planting than large seedlings of E. globulus. 相似文献
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A Critical Overview of Forestry Seedling Production Policies and Practices in Relation to Smallholder Forestry in Developing Countries 总被引：2，自引：2，他引：0
This paper reviews forestry seedling production systems in South-east and East Asia and identifies problems with respect to seedling quality, seedling distribution and financial sustainability, and measures which have been adopted or advocated to improve performance in this sector. The paper draws in particular on experience in a series of research projects on smallholder forestry in the Philippines. Some observations are also drawn from the following papers in this combined special issue of Small-scale Forestry. It is found that a mix of public and private sector models are adopted for forestry seedling production, between and even within countries. Often nurseries are set up to provide seedlings for a government-directed expansion in tree planting, and have difficulty surviving once the initial planting purpose is completed. Private nurseries often lack resources, and depend on contracts to supply seedlings for financial viability. Demand tends to be highest for fast-growing species (often exotics), fruit trees, and ornamentals in the case of urban nurseries. Government policies typically favour quantity over quality of the seedlings produced. Considerable scope exists for adopting best or at least improved management practice in seedling nurseries. 相似文献