中低强度间伐对杆材阶段马尾松林生物量的影响

对杆材阶段不同密度的马尾松林在低强度间伐后生物量的动态变化进行了分析对比，结果表明间伐后平均木的单株生物量和各器官生物量随密度增加而减少；随林分年龄的增加，单株生物量与树干、皮、根的生物量因积累而增大，但枝、叶的生物量先增加后减少，在林分年龄为20a时达到最大值，随后又接近间伐前的数值；林分生物量随年龄增加而增加，其中密度为3000株     

铺地竹生长节律的观测

从出笋、退笋、高生长规律3个方面对铺地竹的生长发育规律进行了系统的观察,结果表明:铺地竹从3月中旬开始陆续出土,一直到4月中旬,共持续37 d.前期和盛期所出的笋成竹率比较高,并且所成的竹比较强壮.退笋一般发生在10 cm以下的高度.竹秆的高生长遵循慢一快一慢的规律,历时39 d左右,后期出土的笋能较快完成高生长是由于其生长初期和末期时间短的缘故.铺地竹高生长和土壤温度呈显著正相关关系.     

木材初期腐朽研究综述

木材容易受到各种微生物的侵袭,真菌腐朽是导致木材破坏最严重的一种方式,即使是在木材质量损失率很小的腐朽初期,真菌也可以迅速引起木材结构的破坏,导致木材强度的急剧降低.生物培养和显微镜观察被认为是目前唯一权威的用来检测和评估木材初期腐朽的方法,但这些方法很难对木材的初期腐朽进行快速、准确地评估.因此,寻找一种迅速、准确地检测和评估木材初期腐朽的方法倍受人们的关注.有关初期腐朽及其检测与评估的研究在国外已有大量报道,而在我国却极为少见.本文综述了近几十年国内外有关木材初期腐朽及其检测与评估的研究,旨在增强人们对木材初期腐朽危害的认识,并呼吁有关部门重视相关研究在我国的发展.     

木材内部腐朽特征识别专家系统

简单介绍了专家系统在林业上的应用 ,详细阐述了木材内部腐朽特征识别专家系统的设计过程。该系统可以为合理造材 ,提高木材的经济价值提供依据。     

Effects of management on coarse woody debris volume and composition in boreal forests in northern Sweden

Forest management practices have led to a reduction in the volume and a change in the composition of coarse woody debris (CWD) in many forest types. This study compared CWD volume and composition in reserves and two types of managed forest in the central boreal zone of Sweden. Ten areas were surveyed, each containing clear-cut, mature managed and old-growth stands, to determine the volume of standing and lying CWD in terms of species composition, decay class and size class. Volumes of CWD on clear-cuts and in mature managed forests were high compared with previous studies. Old-growth forests (72.6 m³ ha^?1) contained a greater volume of CWD than mature managed forests (23.3 m³ ha^?1) and clear-cuts (13.6 m³ ha^?1). Differences were greatest for the larger size classes and intermediate decay stages. Despite stand ages being up to 144 years, CWD volume and composition in managed forests was more similar to clear-cuts than to old-growth forests.     

海南沿海防护林体系现状及建设对策

介绍海南省自然地理概况及沿海防护林体系概况.分析沿海防护林体系目前存在着不合理的开发造成的断带现象严重,林带质量不高,防护效能低下,营林技术手段落后,个别地方仍存在毁林行为等问题.提出了科学规划、合理布局,依靠科技,强化树种选择,创新资金投入机制,以法制林、强化管理等对策.     

Anatomical characterization of decayed wood in standing light red meranti and identification of the fungi isolated from the decayed area

To further our understanding of wood decay in living light red meranti (Shorea smithiana) trees, microscopic characteristics of the cell and cell wall degradations of S. smithiana wood in the presence of the decay fungi, the identity of the causal fungi, and the decay potential and pattern by an isolated fungus were investigated. Cell wall degradations, including cell wall thinning, bore holes formation, rounded pit erosion, and eroded channel opening were clearly observed under light and scanning electron microscopy. In transverse view, many large voids resulting from a coalition of degraded wood tissue appeared in the decayed canker zone. All these observations suggest the well-known simultaneous decay pattern caused by white-rot fungi. By phylogenetic analysis based on the sequences of internal transcribed spacer region of ribosomal DNA, a basidiomycete fungus isolated from the decayed wood was identified as Schizophyllum commune. The degradation caused by this fungus on sound S. smithiana wood in an in situ laboratory decay test was classified as the early stage of simultaneous decay, and showed a similar pattern to that observed in the wood samples naturally decayed.     

锈色粒肩天牛扩散规律研究

通过对3块标地资料的分析,得出锈色粒肩天牛的扩散规律遵从指数曲线y=aebx(b<0),只是在不同虫口密度下,参数a、b取不同的值,进一步确定带虫苗木调运是锈色粒肩天牛蔓延扩散的主要传播途径,加强检疫是防止锈色粒肩天牛蔓延扩散的有效手段。     

樟子松热处理材耐久性能的评价

对樟子松热处理材进行室内防霉、防蚁蛀及野外埋地检测,综合评价其耐久性能。结果表明:樟子松热处理材对霉菌、变色菌均无防治效力,不抗白蚁蛀蚀;樟子松热处理材的耐久年限约为3年。     

肿节少穗竹地下茎生长规律研究

主要研究肿节少穗竹的地下茎的生物学特性,即竹鞭年生长规律、竹鞭垂直分布与水平分布、竹鞭芽变化规律及竹鞭根系生长规律,研究结果表明：竹鞭延伸生长量与温度关系密切,一年中鞭笋生长量随着月均温的升高而加大,8月达到最大,到12月冬季来临进入休眠;竹鞭主要分布在0-40cm土层,且分布较为均匀,40cm以下分布很少;2—3龄鞭壮芽数、笋芽数最多,转化为笋及鞭也多。根的萎缩一般从3年生鞭开始,但肿节少穗竹2年生即有萎缩,4年生鞭未发现有再生不定根。