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通过对武夷山野生香榧资源调查,基本摸清了武夷山境内野生香榧自然分布状况及生态环境持征。主要分布在星村镇桐木村、上梅乡岭山村、金竹村,岚谷乡岭阳村、吴屯乡上村村等5个乡镇,海拔均在580m以上。桐木村和上梅乡的香榧群落胸径分布220cm以内,集中分布在30~60cm,占51.91%;吴屯乡和岚谷乡的香榧群落主要集中在胸径20cm以下,占60.71%。说明香榧群落的更新能力强,群落还比较年轻。本文明确了香榧种质资源在武夷山的自然分布状况,分析了古树群衰退原因,提出了产业发展对策。 相似文献
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广州市古树群保护现状调查 总被引：1，自引：0，他引：1
通过对广州市古树群保护情况进行全面的实地调查，介绍了广州市古树群的数量、分布情况、树种情况、生长环境、主要古树群以及古树生长状况。通过调查、树龄鉴定及对古树维护技术队伍的建设情况的了解总结了广州市古树群保护现状。深入分析了广州市古树群的生存危机，指出由于缺乏经济价值及树木的保护意识不够等原因，大多数格木群、乌榄群、荷木群遭到严重破坏，存在白蚁危害、随意砍伐等问题。文章针对古树群存在的主要问题，提出持续开展白蚁综合防治工作、建立古树群生态保护区等保护对策。 相似文献
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近日，湖北省远安县花林寺镇木瓜铺村发现一处古树群落，这是该县的第十三处古树群。该古树群共有古树29株，其中马尾松9株，栓皮栎19株，檀树1株，树龄均在220年以上。最大1株古树胸径达1.2米。 相似文献
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对松阳县香榧病虫害发生情况进行调查分析。于2020年4月～2021年6月对选取浙江省丽水市松阳县4种香榧林进行病虫害调查，包括纯幼苗林、纯幼树林、幼古树林、幼树套种林，分析病害(香榧绿藻、香榧膏药病、香榧枝条黄化)和虫害(香榧瘿螨、白蚁)发生情况。香榧绿藻：纯幼苗林感病率(88.67%)最高，纯幼树林感病指数(0.30)最高；香榧膏药病：纯幼苗林和幼树套种林种未发生此病，纯古树林，纯幼树林感病指数均为0.08,感病率分别为23.33%、14.17%;香榧枝条黄化：纯幼树林、幼树套种林、幼古树林、纯幼苗林感病率分别为27.50%、16.25%、12.50%、8.75%,感病指数与感病率呈正相关；香榧瘿螨：幼树套种林中香榧瘿螨危害率达到31.67%,其余林分中未发现香榧瘿螨；白蚁：幼树套种林白蚁为害率(30.83%)最高，纯幼苗林白蚁为害率(15.83%)最低。5种病虫害在4个不同香榧林中均未出现大规模成灾表现，仅在个别林地中局部发生。 相似文献
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为了查清湖北省古树群资源状况,采用资料收集和现场补充调查的方法,对湖北省内古树群的种类、数量、分布、生长现状等进行了调查。调查表明:湖北省共有古树群473个,15015株,隶属37科77属121种,主要树种为水杉、马尾松、桂花和银杏。古树群主要分布在恩施土家族苗族自治州、黄冈市、随州市和咸宁市,呈现集中分布为主,零星分布为辅的格局。目前湖北省古树群整体生长状况良好,但也受到立地条件差、病虫害、人畜破坏和自然灾害等因素的危害。建议今后古树群的保护利用中加强宣传、落实管护责任制、加强古树群保护利用研究、将古树群纳入全域旅游战略、完成湖北省古树群保护利用规划。 相似文献
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<正>由山西省绿化委员会办公室主编、《山西林业》杂志主编原荣立摄影的《三晋古树群》画册由山西经济出版社2014年12月出版发行。该书是目前我国惟一一部介绍古树群的大型画册。画册收录古树群95处,其中千年以上的古树群6处,500年以上的古树群15处,100年以上的古树群74处,树种主要为油松、侧柏、辽东栎、国槐、楸树、枣、 相似文献
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对浙江东阳市30年来香榧早实丰产栽培生产实践的调查表明:香榧可以通过多种途径实现早实丰产.当地已经形成5种模式:野生砧就地嫁接模式,野生砧异地嫁接模式,实生大苗多头嫁接模式,嫁接大苗工程造林模式和嫁接壮苗加强管理模式;提出了获得早实丰产的9项技术措施:坚持适地适树;选用早实品种;坚持壮苗浅栽;摘顶修枝整形;间种抚育管理;合理正确施肥;年年深挖促根;及时防治病虫;适时调控结实.该市现已建成约75 hm2早实丰产香榧试验园,年产榧蒲103 t,产生高达1 500多万元的经济效益. 相似文献
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威信县名木古树保护管理对策 总被引：2，自引：0，他引：2
介绍威信县名木古树种类、数量、分布等概况以及名木古树所具有的科学研究、革命历史教育及民族文化传承等方面的意义.分析威信县名木古树保护与管理存在着家底不够清楚,管理机构不健全,社会各界保护意识不强,缺乏专项管护经费,管理人员技术素质不高等问题.提出了健全管理机构,提高公众保护意识,多渠道筹集管护经费,强化管理措施,建立和完善监测体系等对策及相关的技术措施. 相似文献
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在查阅资料的基础上,采用调查和走访相结合的方法,对广东省新丰江水库周边6个镇的古树进行逐株调查.结果表明:新丰江水库共有古树59株,包括薄叶蕈树(Altingia tenuifolia)、木荷(Schima superba)、秋枫(Bischofia javanica)、榕树(Ficus microcarpa)等13个种,隶属于10科12属.从古树资源的结构看,古树树龄主要集中在200~300 a,Ⅲ级、Ⅱ级和Ⅰ级古树的数量分别为49、8和2株;树高主要集中在17.0~25.0 m,平均树高22.9 m,胸径主要集中在50.0~125.0 cm,平均胸径118.0 cm,冠幅主要集中在10.0~17.0 m,平均冠幅17.1 m;从空间分布特征看,古树主要集中分布在东南部的新港镇;新丰江水库的古树主要是作为乡村的风水树而得到保护,整体生长状况良好、正常、衰弱和濒危级古树分别有46、11和2株,衰弱和濒危的原因主要是部分古树缺乏管护,生境较差,或受病虫害侵扰.根据调查结果,对新丰江水库古树资源应加强管理和保护,对现有衰弱和濒危的古树应采取施肥、病虫害防治、修补树洞、改善生境等复壮措施. 相似文献
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Dong Yuku Zhao Chunrui Northeast Forestry University 《林业研究》1991,2(1):83-90
In this paper,the physical and mechanical properties of important Chinese woodswere studied by using the methods of variable analysis, regression analysis,correlation analysis,principle component analysis and so on systematically.The results showed synthetical characteristicof the physical and mechanical properties of Chinese woods.Some opinions of former authors wererevised and some new laws were discovered.That is helpful to study of the physical and mechanicalproperties of woods. 相似文献
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This paper describes a model for assessing the potential forsustained management of ancient woodland at the local landscapescale, based on the premise that a ‘normal’ foreststructure is the best option for integrating nature conservationwith provision of a regular supply of timber. The concept of‘normality’ is applied to clusters of small ancientwoods which are considered together and treated as a whole. Data on ancient woodland distribution are used from West Sussex,Essex and North Yorkshire. At ten sample points within eachcounty the woodland area within a 25-km2 block centred on thepoint was considered to see whether a normal forest structurecould be created and maintained by sustained management usinglikely minimum felling rates and average rotation lengths forthe main species for both high forest and coppice systems. Themodel was also tested for situations where small woods or woodswith conservation status were excluded from the system, as wellas for different minimum felling rates. The areas proposed forfelling within ancient semi-natural woods currently listed withinthe Woodland Grant Scheme (WGS) (II) are higher than can bemaintained in the longer term in West Sussex and Essex. The model provides a preliminary method for setting the contextof individual forestry schemes withn the wooded landscape asa whole. 相似文献
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Little is known about the influence of former agricultural use of soils on the forest recovery process in post-agricultural black alder (Alnus glutinosa) woods – the most fertile and the wettest forest habitats among the European temperate forest types. Thus, studies focusing on edaphic, hydrological and light conditions responsible for colonization mechanisms present in such woodlands adjoining ancient ones were undertaken in south-western Poland. In the 16 m2 quadrats of the 33 transects laid out perpendicularly across the ancient-recent forest boundary, data were collected on herb layer composition, chemical soil properties, as well as illumination level. Additionally, groundwater level in the spring months was recorded in piezometers. The number and cover of true woodland herbs were higher in ancient woods, regardless of forest type. Soils in ancient woodlands reached higher levels of Al3+, K+, cation exchange capacity (CEC), available K, P, and organic C, whereas their pH was lower. The illumination level of the forest floor was greater in recent woods. Linear regression showed that recent wood age had a negative effect on pH and base cations, but positive on Fe2+, Ca2+, available P and Mg, CEC, and on C and N contents. CCA results showed that woodland age, pH, humus type, groundwater level, available Mg and K were always among those variables having the highest contribution in explaining the distribution pattern of woodland species in recent woods. Total N and available P contents were always higher in ancient woodland soils than in recent, and their content grew with time. Thus, they cannot be treated as indicators of former agricultural use of recent alder wood soils. Urtica dioica, Poa trivialis and Galium aparine, the three competitive herbs, avoided sites with a high level of groundwater, combined with poor illumination level. In order to create the best possible conditions allowing for effective forest recovery in habitats of such high fertility, it is essential to maintain a good water regime and shade in the forest floor. This in turn reduces the competitive exclusion of woodland flora by the aggressive herbs and facilitates the immigration of typical woodland herbs. 相似文献