共查询到20条相似文献，搜索用时 93 毫秒
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通过对辽西地区榛子人工林病虫害防治的探索,总结出了适合阜新地区的榛子纯林主要病虫害的综合防治方法,为榛子产业发展提供科技支撑。 相似文献
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对大兴安岭地区野生榛子资源利用、榛子栽培、市场开发等现状进行总结,并针对存在的问题对该地区榛子产业发展提出一些建议。 相似文献
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近年来,以平欧杂种榛子为主的干果生产加工业在清原县发展迅速。该文通过调查了解清原地区现有平欧杂种榛子的生产栽培现状,分析、总结在清原地区发展平欧杂种榛子的关键问题及栽培管理技术,以促进该产业的发展。 相似文献
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辽宁省内一些地区的平欧榛子成树成片死亡,严重影响到榛农切身利益,因此解决榛子枯死问题迫在眉睫。该文剖析了平欧榛子成树枯死的主要原因,并提出及时浇水缓解春季旱情,入冬前将树体基部涂白防止日灼,榛子果树与苗木分开经营等对策。 相似文献
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为研究不同虫口密度蛴螬对新植榛苗的危害及防治措施,进行了沙地新植榛苗蛴螬防治试验。在正常栽植条件下,以蛴螬3龄幼虫为试虫,采用人工接虫的方法,研究蛴螬虫口密度与新栽植榛苗死亡率之间的关系。结果表明:蛴螬的虫口密度与榛苗死亡率间存在极显著线性正相关关系(y=4.937x-4.502,r=0.989),二者相关性极显著。初步确定新植榛园蛴螬3龄幼虫的防治指标为每株3.949头。在试验区内对新植榛苗采用不同药剂灌根法防治,结果显示:采用稀释800倍液的4.5%毒死蜱乳油的防治效果最佳,可达85%。 相似文献
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浅论内蒙古大兴安岭林区东南部榛林经营问题 总被引：1，自引：1，他引：0
文章论述了内蒙古大兴安岭林区东南部榛林的生境、分布及利用现状 ,提出了合理经营榛林的方法、途径 ,探讨了经营榛林的前景 相似文献
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平榛（ Corylus heterophylla Fisch 。）是东北地区的主要经济林树种,其坚果是食用榛子的主要来源。利用平榛进行榛子遗传改良,是培育新品种的重要方法。通过多年的研究总结出一套平榛花粉收集技术,为杂交育种提供了技术的保证。透光率对雄花序生长的影响呈负相关,透光率越低,雄花序开花时间延长,花序也伸的长,花粉产量少;而透光率对花粉产量则相反,透光率越高,雄花序开花时间越短,花粉产量多。雄花生长与花粉产量受种源、水培时间的影响,其差异性显著。 相似文献
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根据丹东市振安区"十二五"期间发生的森林火灾统计数据,从地域分布、季节变化、起火时间、火灾起因四方面进行丹东市振安区森林火灾发生规律研究。结果表明:"十二五"期间,丹东市振安区共发生森林火灾162次,受灾森林面积50.7hm2;森林火灾发生存在明显的区域差异,可将丹东市振安区划分为森林火灾重灾区、一般灾区、轻灾区三类区域;主要发生季节在春季防火期内,4月为高发期;起火时间主要集中在10:00—14:00,占69.75%;主要起火原因为清明节上坟用火。 相似文献
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Tree Seed Production and Food Conditions for Rodents in an Oak Wood in Southern England 总被引：5，自引：0，他引：5
Seed production and seed losses were monitored in an oak (Quercusrobur) wood in southern England between 1975 and 1988. In additionto acorns, seeds from several large beech (Fagus sylvatica)and sweet chestnut (Castanea sativa) trees which occurred withinthe wood, and from the understorey of hazel (Corylus avellana)trees, were also monitored. The seeds from these four tree speciesare all subject to heavy predation by rodents, as well as otherseed-eaters such as birds and insects. Seed fall tended to be irregular and three years, 1976, 1985and 1987 were considered oak mast years. There were too fewyears with large acorn crops to examine whether resource depletionin these years resulted in poor crops in subsequent years. Therewas no correlation in seed production between the four treespecies which does not agree with one of the predictions ofthe predator satiation theory of masting behaviour. The effectsof weather on seed production were investigated but few significantcorrelations were found. In general the results tended to supportprevious findings. Between 1980 and 1982 a serious outbreakof Tortrix moth caterpillars occurred within the wood and mayhave affected acorn production. A negative relationship wasfound between oak defoliation and acorn production in the subsequentyear. The loss of seeds from the forest floor was initially rapidand in 9 years no seeds survived into the following year andfood conditions were poor for granivores. In 3 of the remaining4 years acorns survived well into spring and early summer providinggood food conditions for forest rodents through to the timeswhen alternative food supplies became available. Although oaktrees contributed most seed energy in good years, the othertree species, especially beech, became important when acornproduction was poor. Predispersal losses due to predators werefrequently high and averaged 80 per cent, 40 per cent, 38 percent and 33 per cent in hazel, sweet chestnut, oak and beechrespectively. On average, hazel nuts tended to fall first, some6 weeks before acorns which tended to be the last seeds to fallof the four tree species. Knopper galls and weeviled acornsfell earlier than sound acorns. A key-factor analysis indicatedthat a failure to mature, predispersal predation and insectinfestation from weevils and Knopper galls contributed equallyto changes in numbers of acorns among years. 相似文献
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20 0 3年5月～2 0 0 4年6月,在黑龙江省带岭林业局采用人工孵化技术,对野生花尾榛鸡卵和人工饲养花尾榛鸡卵的孵化率及其影响因素进行比较研究,野生花尾榛鸡卵的孵化率为74 4 0 % ,人工饲养条件下花尾榛鸡卵的孵化率为4 1 4 1%。对孵化率进行T检验,其T =7 830 ,df=10 ,T >t10 ,0 0 1=2 76 4 ,差异极其显著。分析认为,产生花尾榛鸡卵孵化率差异主要是因所食食物和栖息生境的不同所致。 相似文献
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Natal dispersal and habitat selection of hazel grouse Bonasa bonasia juveniles were assessed by radio tracking in a temperate forest of South Korea during June 2003–November 2006. The birds used in the dispersal analysis (n = 43), 88% of birds dispersed. The average dispersal of hazel grouse from the natal area was 2231 ± 494 m (mean ± SD); range 134–6267 m. There were no significant differences in dispersal rate and distance between sexes. Hazel grouse’ habitat use differed from random use of available natal dispersals. In this natal dispersal scale of habitat selection, natural deciduous forest ranked highest, followed by mixed forest, coniferous plantation, deciduous plantation and others (rock and bare lands). We found that in general, the hazel grouse is an active disperser. Knowledge of aspects of habitat use that are relevant to dispersal may provide a better assessment of the fitness effects of dispersal in proximate and ultimate terms. 相似文献
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Following its first detection, Halyomorpha halys has become a key pest in many crops in NW Italy. In this area, one of the most important crops is hazelnut, in which the species can cause severe damage through feeding on nuts. Therefore, semi-field trials were carried out in NW Italy to compare the harmfulness of H. halys with that of the local hazelnut bug species, such as Gonocerus acuteangulatus, Nezara viridula, and Palomena prasina. Additionally, a 2-year field survey was conducted in hazel groves in NW Italy and W Georgia, another important hazelnut cropping area, to assess the presence and abundance of the new invasive species and to evaluate the damage at harvest. Monitoring was carried out by plant beating and by commercial traps throughout the growing season. In semi-field trials, H. halys was the most harmful species, causing the highest damage in kernels, and was able to survive and reproduce at higher rates. During field surveys in NW Italy, H. halys was sampled in groves late in the season in 2015 and, with higher populations, throughout the season in 2016. In W Georgia, bug population levels consistently increased in the 2-year period, resulting in a significant increase in damage at harvest in 2016. A similar trend is hence expected also in NW Italy in the following years. Moreover, data on individuals collected in different points of the hazelnut groves confirmed the border-driven behavior of this pest, leading to consideration of potential integrated pest management solutions. 相似文献