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龙脑樟矮林作业技术和效益分析 总被引：6，自引：1，他引：5
龙脑樟是樟树中新发现的一个化学模型,是提取天然冰片的理想原料。简要介绍了龙脑樟的矮林作业技术,以及对不同立地条件、不同施肥量、不同采割时间和不同采割方式的龙脑樟矮林作业的经济效益作了对比分析。结果表明：在适生的立地条件下,龙脑樟矮林作业年产值达８．２万元／ｈｍ＾２,利税达６．２万元／ｈｍ＾２。 相似文献
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平南县林业局围绕市场经济,积极引导群众适地适树选择肉桂经营方式,促进肉桂生产。去冬今春种植肉桂1793.8公顷,全县玉桂生产再上一个新台阶。矮林作业:以采桂叶蒸油、剥桂通为主要经营目的,其特点是收效快、周期短,通过造林后采叶、间伐、剥桂通、萌芽更新、择伐或轮伐获取经济效益。技术人员引导群众选择交通方便肥瘦适中的山腰、山坡林地进行矮林作业。矮林作业每亩造林667株(1×1米)或556株(1×1.2米),由于适 相似文献
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引言银合欢(Leucaena leucocephala)具有很强的萌芽能力,能够迅速和反复地砍伐提供薪炭材。但在印度,对于矮林作业的薪炭材产量却甚少研究。Pathak等人(1982)在占西对普通银合欢品种在不同季节和不同高度的矮林作业产生的萌条,进行比较试验,发现3月份砍伐比在1月份砍伐产生的萌条要多;他们还注意到砍伐高度距地面15cm产 相似文献
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肉桂人工林生物量及生产力的研究 总被引：7，自引：2，他引：5
本文调查了肉桂矮林作业三代林分的地上部分生物量和生产力,结果表明,肉桂５年生实林分生物量和生产力分别为２９４９７．１７ｋｇ／ｈｍ＾２和５１５．９８ｋｇ／（ｈｍ＾２．月）萌芽林分生产力及生物量均随砍伐收获次数增加而下降,萌芽林分生产力随生长期增长而下降,萌芽林的当年落叶量随生长期和砍伐收获次数的增加而减少,根据初步研究结果,建议肉桂人工林的矮林作业,宜在第六年后才开始砍伐收获。 相似文献
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为了探讨喷施IBA对芳樟矮林萌芽和生长的影响，为芳樟矮林作业提供理论依据，以2 a生芳樟矮林为材料，设置5个IBA浓度梯度，采用SPSS对芳樟矮林萌芽数、萌枝数、地径、株高、冠幅、生物量和出油率进行分析。结果表明：萌芽数、地径、株高和冠幅随喷施IBA浓度的增加而增多，100 mg·L-1IBA处理萌芽数最多，地径、株高和冠幅最大，IBA对萌枝数的影响不明显。单株鲜重也随喷施IBA浓度的增加而增大，100 mg·L-1IBA处理单株鲜重最大，单株叶鲜重、小枝鲜重和主枝鲜重与单株鲜重变化趋势相似。喷施IBA对鲜叶出油率影响不明显，对单株鲜叶精油产量有显著影响，100 mg·L-1IBA处理单株鲜叶精油产量显著高于其他处理。因此，喷施100 mg·L-1IBA对芳樟矮林萌芽、生长、单株鲜叶精油产量最好。 相似文献
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<正> 樟树(Cinnamomum camphora),又名香樟,小叶樟,是我国珍贵用材树种之一。为了查明樟树人工用材林有机物质的积累、变化和分配规律,我们于1985年对本场21年生樟树林分生物量进行了测定。一、样地概况样地设置在三明莘口小湖工区的低丘南、北两个坡面上。坡度20—30°,海拔200—300米。土壤为红壤,土层厚1米以上,腐殖质层6—30厘米,pH值5—5.5。样地面积150平方米,计20块。本区属亚热带气候,年均温19.4℃,年降雨量1,586.4毫米(多集中在4—6月)。冬季干旱、多雾,年均湿度81%,无霜期300天左右。樟树林是在阔叶林采伐迹地上人工更新起来的,初植密度2,500株/公顷。造林后3—8年曾受到樟树卷叶蛾和樟巢螟的严重为害,前5年每年抚育两次,以后不定期抚育。现林分 相似文献
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介绍了木兰林管局杨桦多萌矮林的情况,阐述了杨桦多萌矮林的优势与劣势,并从更新方式、幼抚方式、形干阶段、疏伐阶段、收获阶段5个方面对杨桦近萌矮林的经营管理技术措施进行了总结归纳,对木兰林围场境内的杨桦多萌矮林经营具有借鉴、指导的意义。 相似文献
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通过对樟树福建柏混交林40个样圆的调查,以樟树为对象木,采用Hegyi单木竞争指数模型分析樟树的种内种间竞争关系.结果表明,樟树的种间竞争强度大于种内竞争强度,并且竞争强度随对象木径级的增大逐渐减小.当对象木径级≥23 cm时竞争强度变化较小,径级在14～17时受到的种间竞争强度最大.樟树种内、种间、林分的竞争强度符合幂函数CI =AD-R的关系,用此模型拟合各径级的种内、种间竞争强度效果良好,可对不同径级的樟树所受的竞争强度进行预测. 相似文献
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通过对嘉兴市农田林网树种种类、配置和生长情况的调查研究,得出:该地区农田林网树种种类丰富,但主要集中在水杉、香樟等11个树种,且树种配置以纯林和简单混交为主,导致林带结构比例失调,林相简单;并据此提出了4条建议。 相似文献
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首先选用生长适宜性指标、抗逆性指标、生态功能指标作为控制层,生长周期、更新能力、生长速度、抗旱性、抗寒性、耐瘠薄性、冠层疏透性和根系特性等8个因子作指标层,用层次分析法对柏木、马尾松、桤木和香樟等20个供选树种进行模型选择,然后对得分较高的树种分别在川中丘陵区的柏木纯林、马尾松纯林、松柏混交林中进行改造后的栽培对比试验。结果表明:(1)模型筛选出适宜川中丘陵区的乔木树种分别为麻栎、栓皮栎,刺槐,桤木,喜树,香椿,马尾松、香樟、柏木9个,灌木树种为马桑,黄荆,火棘3个。(2)从成活率、保存率和生长状况分析,香樟、桤木、喜树、窄冠刺槐、香椿均可用于在柏木纯林中补植,立地条件较好的地块以补植香椿为宜,立地条件差的林分中以补植窄冠刺槐为宜。马尾松纯林中应补植香樟和栓皮栎,但补植香樟时应选择土层较厚,土壤含水量较高的林分。补植的苗木以2a生大苗为宜。 相似文献
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通过对石漠化地区8 a生芳樟(Cinnamomum camphora)人工林测定分析,结果表明:芳樟的树高、胸径及材积生长规律均呈现出前期缓慢、后期快速的特性,造林第4年后胸径生长进入速生期,第5年后树高快速生长,材积生长的速生期则出现在第6年;估算芳樟单位面积纤维材产量达24.32 t/hm2,芳樟油95.67 kg/hm2,单位面积产值达18080元/hm2;枯落物蓄积量为5.57 t/hm2,有效拦蓄量达6.36 t/hm2,高于相同立地的任豆(Zenia insignis)和苏木(Caesalpinia sappan). 相似文献
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The Hellshire Hills are an extensive area of tropical dry forest over limestone, located on the south coast of Jamaica. Despite being a protected area, they are subject to encroachment and clearance by charcoal burners, leaving a relatively pristine core within more disturbed areas of forest. Future management requires a consideration of the forest’s resilience to such disturbance, and this study reports on coppice regrowth following clearance. The number of coppice shoots and the length and diameter at breast height (DBH) of the leading shoots were measured on tree stumps 14 months after they were cut in an experiment. Coppice regrowth after cutting was measured on a total of 476 stumps, representing 51 species. Coppice production and growth was vigorous as there was an extremely high incidence of coppice regrowth among and within the species in this forest after it had been cut. Initial regrowth was high with the diameter recovered by the leading shoots after 14 months approximating to 29% per year. Of the 51 species sampled three did not coppice at all and the average percent of individuals found with shoots within each species was 81%. The height and diameter of the leading shoots was significantly different among the species and the average height recorded of the leading shoots was 114 cm while the average diameter recorded was 10 mm. Larger sized stems (>10 cm DBH) on average produced more coppice shoots and larger sized shoots than smaller sized stems (<10 cm DBH) while smaller sized stems recovered more biomass than larger sized stems irrespective of species. The average diameter of the leading shoots decreased significantly with increasing shoot densities. At the species level there was a significant relationship between stem diameter and the number of shoots produced in seven of the 27 species analysed and three species returned significant relationships between stem diameter and average height of leading shoots. Coppice regrowth clearly offers considerable resilience to disturbance in this dry forest where successful regeneration by seed is highly susceptible to rainfall seasonality. However, the different abilities of species to produce coppice shoots will likely affect long-term species diversity if the present rate of clearance continues. 相似文献
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文章以结构调控初期的城镇景观林为对象,调查测定间伐第1年主要树种的伐桩萌芽情况、萌枝数量、高度以及群落垂直结构,分析树种的萌枝能力及其群落的结构变化。结果表明,各树种的萌枝能力均较强,不同树种间存在极显著差异(F=129.5,P < 0.001),呈现"常绿树种产生数量多、植株矮小的萌枝,落叶树种产生数量较少、植株高大的萌枝"的格局。砍伐降低了林分密度,为冠层受压树种释放空间;同时,伐桩萌枝以其生长优越性快速恢复,占据高度3 m以下的空间,丰富了群落的垂直结构。因此,城镇景观林结构调控时,可通过砍伐并适当保留伐桩萌枝达到既控制林分密度又促进群落分层、维持群落和景观稳定性的作用。
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Analysis of the changes in forest ecosystem functions,structure and composition in the Black Sea region of Turkey 总被引：1，自引：0，他引：1
We used geographical information system to analyze changes in forest ecosystem functions, structure and composition in a typical department of forest management area consisting of four forest management planning units in Turkey. To assess these effects over a 25 year period we compiled data from three forest management plans that were made in 1986, 2001 and 2011. Temporal changes in forest ecosystem functions were estimated based on the three pillars of forest sustainability: economics, ecology and socio-culture. We assessed a few indicators such as land-use and forest cover, forest types, tree species, development stage, stand age classes, crown closure, growing stock and its increment, and timber biomass. The results of the case study suggested a shift in forest values away from economic values toward ecological and socio-cultural values over last two planning periods. Forest ecosystem structure improved, due mainly to increasing forest area, decreasing non-forest areas (especially in settlement and agricultural areas), forestation on forest openings, rehabilitation of degraded forests, conversion of even-aged forests to uneven-aged forests and conversion of coppice forests to high forests with greater growing stock increments. There were also favorable changes in forest management planning approaches. 相似文献
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以广东天井山林场2008年遭受特大冰雪灾害损毁的杉木林为对象,通过采用伐除受损杉木,人工引入木荷、黎蒴、火力楠、樟树等乡土阔叶树种,及保留杉木萌芽更新等方式,开展人工促进受损杉木林植被恢复研究。结果表明,人工修复5年后,形成了良好的杉木阔叶树混交林,萌芽杉木平均胸径达到4.41~5.48 cm,木荷、黎蒴、火力楠、深山含笑、黎蒴、樟树平均胸径分别为2.72、6.03、2.59、1.75、4.10、3.30 cm。在水平分布格局上,9个样地属随机分布,6个样地呈均匀分布,无样地呈聚集分布;树种混交度呈弱度、中度混交;树种间竞争优劣顺序依次为黎蒴、木荷、樟树、火力楠、深山含笑。不同配置的阔叶树种所形成林分的空间结构特征没有明显差异。修复受损杉木最佳的树种为黎蒴,其次是木荷、樟树、火力楠,最后是深山含笑。 相似文献