杉木第二代种子园亲本性状遗传变异研究

以沙县官庄国有林场22年生的杉木第2代种子园为研究对象,对220个无性系进行系统测定,探讨了无性系生长、形质和结实性状的遗传变异规律,结果表明:生长性状、形质性状和结实性状在无性系间的差异达到极显著水平,而且无性系的重复力值均较大;从220个无性系中综合筛选出丁74等35个优良无性系,各优良无性系生长量大、结实性状良好,22年生时的平均树高、胸径、材积值分别高达17.56 m、33.60 cm和0.803 35 m3,分别大于种子园中调查的220个无性系平均值的20.36%、17.73%和57.32%,综合性状表现优良,可用作高世代种子园建园材料和杂交育种的亲本材料。     

应用菊酯油烟剂喷烟防治杉木种子园害虫试验

1993-1994年在洋口林场应用3Y－25型脉冲式烟雾机喷施0．05％溴氰菊酯油烟剂防治杉木种子园害虫的试验。结果表明：菊酯油烟剂喷烟可同时防治杉木球果麦蛾、杉木蝙长蝽及杉梢小卷蛾的成虫和幼虫。二次处理区球果虫害率比对照下降45．6％。     

杉木的受害允许水平及粗鞘双条杉天牛防治策略研究

本文在９年生人工纯林中，采用固定标准地、固定标准株连续３年对树高、胸径实测的方法，计算并比较阌 害与末受害木材积及单位面积材积的 失。     

提高杉木种子园种子产量及品质技术措施的研究

对湖南省东安县杉木无性系种子园施肥试验的结果表明：３、６、８月中旬每次每株各施尿素０．４ｋｇ、过磷酸钙０．３ｋｇ、氯化钾０．２ｋｇ为球花产量最高的施肥方案；施肥对当年的种子播种品质有影响，但不大；种子园大片母树不挂果的原因是土壤和树体中锰含量过高而树体中的硼元素缺乏，对此提出对土壤施石灰和对母树针叶喷Ｂ肥的改良措施；３—８月是杉木种子园施Ｎ、Ｐ．Ｋ肥最适宜时期；确定８月是杉木种子园母树营养诊断进行针叶分析的最佳采样时期，并制定出杉木种子园母树的针叶中全Ｎ含量为０．８％、全Ｐ含量为０．１２％、全Ｋ含量为０．７％是其临界值；针叶全Ｎ含量０．８—１．２％、全Ｋ含量０．７－０．９％是其最适浓度范围；中耕松土对种子园种子产量影响不明显。     

不同密度杉木林内辐射与叶面积垂直分布对生长的影响

本文通过对八年生杉木人工林内太阳辐射与叶面积垂直分布的观测与研究，用计算机绘图与计算，得出以下结果：杉木叶面积的垂直分布和叶面积指数与密度有关，冠形因密度增加由圆锥形变为圆柱形，叶面积指数是先上升后下降。杉木林内辐射的消减随密度的增加而加剧，在冠层深3／4处趋于平缓，当郁闭度低于0．85时，林冠下辐射有回升，用累加叶面积指数分层计算林冠消光系数，可减少因叶片分布不均匀而产生的误差，用累计值计算辐射，可简化观测与计算，用辐射吸收率、叶面积指数，杉木个体生物量及年均生物增长量4个指标对杉木林生长作综合评价，八年生杉木林生长的较适宜工是2m×1m。     

杉木小径材胶拼技术

杉木小径材胶拼技术以６－１２ｃｍ的衫木小径材为原料，通过制材、胶拼、干燥和加工等工艺，生产出较大规格的板方材，可代替杉木中、大径材用于家俱、建筑等行业。     

杉木人工林林下植被对立地的指示意义

通过分析53块样地的调查材料,系统地论述了杉木人工林林下植被与林分及立地的关系,表明杉木人工林林下植被具有较强的指示作用,林下植被类型和指示种均可作为杉木人工林立地分类及评价的依据之一。但林下植被的指示性具有一定的局限性,只有当林下植被发育到一定阶段才有较好的指示能力,而且其外延性较差,林下植被指示作用的调查结果不能无限外推。     

Dormancy induction in container-grown Abies seedlings: Effects of environmental cues and seedling age

Twelve-week-old container-grown seedlings of noble fir (Abies procera Rehd.) and Shasta red fir (A. magnifica A. Murr. var. shastensis Lemm.), both high-elevation species, were grown under controlled environments in a study of induction of terminal-bud dormancy. Eight treatment combinations of long (15 h) or short (11 h) photoperiods, warm (25°/20°C) or cool (18°/12°C) thermoperiods, and dry (–1.2 MPa) or wet (–0.6 MPa) moisture regimes were imposed upon seedlings for 12 weeks. Treatment factors significantly affecting the induction of dormancy in terminal buds of seedlings were identified over time. The results suggest that seedlings responded dynamically to dormancy cues. The warm/dry and cool/wet combinations induced dormancy in the first 2 weeks in noble fir and in the first week in Shasta red fir. Short-day/warm and long-day/cool combinations enhanced dormancy induction in weeks 3 to 4 in noble fir and in weeks 1 to 7 in Shasta red fir. Short days and cool thermoperiods independently hastened dormancy induction in noble fir in weeks 5 through 12.     

杉木积成材竹片贴面工艺探讨

对杉木积成材进行了竹片贴面的初步试验，结果表明：杉木积成材进行竹片贴面切实可行；竹片贴面后的杉木积成材密腹略高于基材；竹片与基材之间的胶合强度大于基材内部的胶合强度；贴面板的MOR和MOE高于基材：24h吸水厚度膨胀率佟明显低于基材。     

杉木、马尾松裸根苗水分关系研究

Water relation parameters of bare-root seedlings of Chinese fir (Cunninghamia lanceolata Hook.)and Masson pine (Pinus massoniana Lamb.)were measured and changes of root growth potential as well as field survival rate of both species were studied after the bare-root seedlings were exposed in a sunny field condition.the results showed that masson pine had a lower osmotic potential(-2.07Mpa) at turgor loss point and at full turgor(-1.29Mpa),compared with Chinese fir(-1.80Mpa and -1.08Mpa respectively).The parameter Vp/Vo(63.27%) of Masson pine was higher than that of chinese fir (58.03%).This means that Masson pine has a stronger ability to tolerate desiccation,compared to Chinese fir according to analysis of above water relation parameters.Root growth potential and field survival rate decreased with prolonging duration of exposure.The field survival rate of both species was reduced to less than 40% after the seedling being exposed only two hours.Water potentials of -1.60 Mpa and -1.70 Mpa were suggested to be critical values for Chinese fir and Masson pine respectively in successful reforestation.