红脂大小蠹越冬场所及成虫出土观察

2001-2002年，在山西省中条山森林经营局北坛林场卫村管护站院内和簸箕凹油松人工林中，对红脂大小蠹越冬场所及成虫出土情况进行了观察，结果表明，红脂大小蠹以成虫、幼虫、蛹越冬。越冬场所包括伐桩根及受害木的根、干部和干基部，在干部和干基部不能正常越冬，死亡率极高，在根部能正常越冬，是次年扩散为害的主要虫源。越冬成虫可以由根部直接钻出土表转移为害。     

对玉溪市开展华山松人工林抚育间伐工作的探讨

玉溪市自20世纪80年代以来，共营造了华山松人工林2万hm^2，并还以每年1333hm^2的造林速度递增，到2001年底，全市开展过抚育间伐的林地只占全市应抚育间伐林地面积的5.3%，在分析了未能全面开展抚育间伐原因的基础上，提出了实施对策。     

拟双角斯氏线虫侵染红脂大小蠹幼虫的研究

红脂大小蠹又名强大小蠹 (ＤｅｎｄｒｏｃｔｏｎｕｓｖａｌｅｎｓＬｅＣｏｎｔｅ)主要危害 30ａ以上或胸径 1 0ｃｍ以上的健康油松。成虫一般在树干基部至 1ｍ左右处入侵 ,入侵后先向上蛀食一段韧皮部 ,然后向下取食 ,危害可达根部 40ｃｍ。每头雌成虫可产卵 1 1 0余粒 ,幼虫孵     

浅析我国分布的3种大小蠹的识别与检疫管理

对红脂大小蠹、华山松大小蠹和云杉大小蠹的形态特征、为害寄主以及危害症状进行了比较分析,提出了检疫管理措施,为进境口岸针对性检疫和保护我国的林木资源提供参考。     

红脂大小蠹成虫侵入孔的空间分布型研究

应用扩散系数等6种指数法测定了红脂大小蠹成虫侵入孔的空间分布型。结果表明，红脂大小蠹成虫侵入孔的空间分布型呈聚集分布，分布的基本成分是个体群，扩散蔓延规律为聚集型扩散。聚集的原因分析表明，该虫的聚集是由某些环境因素所致，如食物等。     

中条林局油松、华山松人工林经济效益分析

从单株人工油松，华山松林木入手，确定了长4m，小头直径5cm-9cm规格橡材的工艺成熟龄，结合经济效益的分析，认为油松，华山松人工林，在能出小头径7cm的橡材时经济收入最高，此时林分的林龄为24a。提供了一种和工艺种相结合分析林经济效益的方法。     

The influence of mountain pine beetle outbreaks and drought on severe wildfires in northwestern Colorado and southern Wyoming: A look at the past century

Outbreaks of bark beetles and drought both lead to concerns about increased fire risk, but the relative importance of these two factors is the subject of much debate. We examined how mountain pine beetle (MPB) outbreaks and drought have contributed to the fire regime of lodgepole pine forests in northwestern Colorado and adjacent areas of southern Wyoming over the past century. We used dendroecological methods to reconstruct the pre-fire history of MPB outbreaks in twenty lodgepole pine stands that had burned between 1939 and 2006 and in 20 nearby lodgepole pine stands that were otherwise similar but that had not burned. Our data represent c. 80% of all large fires that had occurred in lodgepole pine forests in this study area over the past century. We also compared Palmer Drought Severity Index (PDSI) and actual evapotranspiration (AET) values between fire years and non-fire years. Burned stands were no more likely to have been affected by outbreak prior to fires than were nearby unburned stands. However, PDSI and AET values were both lower during fire years than during non-fire years. This work indicates that climate has been more important than outbreaks to the fire regime of lodgepole pine forests in this region over the past century. Indeed, we found no detectable increase in the occurrence of high-severity fires following MPB outbreaks. Dry conditions, rather than changes in fuels associated with outbreaks, appear to be most limiting to the occurrence of severe fires in these forests.     

华山松种源幼林性状变异的研究

华山松(Pinus armandi Franch.)分布很广,生态条件变化梯度大。对华山松种源幼林(8年生)性状变异的研究表明,种源间存在着显著差异,多数性状与产地纬度有密切的线性相关,呈纬向为主的渐变群。云贵高原种源生长快、生物产量高、针叶长、针叶着生密度小;而秦岭—大巴山区种源则与此相反。华山松各产地的极端温度是其种源变异的主导因子。     

华山松大小蠹的入侵对华山松挥发物成分的影响

采用气质联动技术对秦岭林区华山松健康木、枯萎木针叶、树脂和韧皮部组织内挥发性物质的组成、含量和生物活性进行了分析。结果表明:华山松针叶、树脂和韧皮部组织内的挥发性成分主要由单萜、倍半萜和二萜组成,其中以α-蒎烯、β-蒎烯、乙酸-龙脑酯、β-石竹烯、α-石竹烯、α-杜松醇、异杜松醇、萜烯醇、杜松二烯为主;华山松针叶、树脂、韧皮部组织内挥发性物质在组成和含量上均有差异,其中以针叶中挥发性物质成分最丰富,其次是韧皮部组织,而树脂的成分则更纯;同时华山松健康木与枯萎木间挥发性物质的种类和含量也具有明显差异。