浅析国内外人造板工业设备自动化水平存在的差异

通过分析国内外人造板工业设备的自动化水平现状，探讨了我国与国外在此领域的差异以及存在的问题。     

Regeneration and gene transformation systems of Robima pseudoacacia ''''Idaho'''' mediated by Agrobacterium tumefaciens

Robinia pseudoacacia 'Idaho' is one of several multi-purpose trees used in ornamental, soil and water conservation, fodder and nectar sources. Plant abiotic stress tolerance transformed by genes could meet the requirements for reclamation of arid or alkalid lands and vegetation restoration. For this paper, we studied the effects of auxin and cytokine on Idaho locust in vitro regeneration and the establishment of gene transformation systems for plants mediated by Agrobacterium tumefaciens. Results showed that the ratios of cytokinin and auxin were the major factors affecting adventitious bud differentiation on a MS medium; the concentration of 0.5 mg·L-1 6-BA benefitted callus proliferation and 0.25 mg·L-1 IBA promoted shoot rooting; however, a higher IBA concentration will inhibit rooting. The most effective antitoxin for screening transgenic Idaho locust shoots was G418 and the most sensitive concentration of it was 8 mg·L-1.     

水分逆境下杨树光合作用的气孔与非气孔调控

对杨树无性系：Ｉ－２１４（Ｐｏｐｕｌｕｓｅｕｒａｍｅｒｉｃａｎａｃｖ．Ｉ－２１４〕，健杨（Ｐ．ｅｕｒａｍｅｒｉｃａｎａＧｕｉｎｉｒｃｖ．Ｒｏｂｕｓｔａ），中东杨（Ｐ．ｂｅｒｏｌｉｎｅｎｓｉｓ）和群众杨（Ｐ．Ｐｏｐｕｌａｒｉｓ３５－４４）一年生盆栽插条苗进行干旱处理，研究了水分胁迫对四种苗木光合作用和叶绿素ａ荧光的影响．结果发现，苗木受旱后可变荧光提高２０－５０％，而恒定荧光未受水分胁迫的影响。鉴于光抑制是以可变荧光的降低为特征，因此得出光系统ＩＩ光反应中心未受伤害的结论。对土壤干旱敏感的Ｉ－２１４和健杨受旱后净光合作用（Ｐｎ）剧烈下降，主要是由于非气孔因素的影响：即ＲＵＢＰ羧化酶（Ｒｕｂｉｓｃｏ）的活性降低．耐旱性强的群众杨和中东杨，Ｐｎ下降的幅度较小，气孔因素和非气孔因素都是影响光合作用的因子。通过干旱或ＡＢＡ处理的叶片叶温升高，抑制了Ｒｕｂｉｓｃｏ的活性，也使叶绿素ａ荧光诱导曲线上的Ｍ峰消失，从而证实了Ｍ峰与光合作用暗反应的相关性。     

喜树幼苗的硝酸还原酶活性及其日变化规律

本文利用体内法测定了喜树幼苗不同器官以及不同叶位叶片的硝酸还原酶活性(NRA),同时观察了喜树幼苗不同叶位叶片的NRA的日变化规律,并考查了NRA与叶面积及比叶重的相关性。结果表明,与根、茎及茎尖中的NRA相比,叶片中的NRA最高。不同叶位叶片的NRA有明显的差异,在所测定的10个不同叶位的叶片中,上数第4~6片叶片的NRA较高。叶片NRA有明显的日变化,呈单峰曲线,峰值出现在中午1230前后。同时,结果表明NRA与叶面积以及比叶重无明显的相关关系。研究结果为进一步研究喜树的氮代谢提供基础资料。图5参18。     

Decision Support in Selection Cutting Planning of Uneven－aged Stand Management

ＤｅｃｉｓｉｏｎＳｕｐｐｏｒｔｉｎＳｅｌｅｃｔｉｏｎＣｕｔｔｉｎｇＰｌａｎｎｉｎｇｏｆＵｎｅｖｅｎ－ａｇｅｄＳｔａｎｄＭａｎａｇｅｍｅｎｔＳｏｎｇＴｉｅｙｉｎｇ，ＺｈｏｕＷｅｎｃｈａｏ，ＦｅｎｇＸｉｕｌａｎＣｏｌｌｅｇｅｏｆＦｏｒｅｓｔＲｅｓｏｕｒｃ...     

专家系统及其在林业和水土保持研究中的应用进展

回顾了专家系统的定义、产生和发展的历史 ,并对其研究现状及在林业和水土保持研究中的应用作了较为详细的阐述     

耐盐杨树新无性系的筛选─—杨树新无性系耐盐水平的综合评定

采用座标综合评定法，Ｒ型因子分析和数量化模型Ⅲ等方法对水培和盆栽等３次试验所观测的各项耐盐指标值进行了综合的评定和分析。综合评定结果把供试的１０个无性系划分为３种耐盐类型：（１）耐盐能力强类型。包括９５，１２１和８９无性系，能忍受０．２％～０．３％的土壤含盐量，（２）耐盐能力中等类型，包括１０５，１０６和３５１等３个无性系，能在０．１％～０．２％含盐量的土壤中生长，（３）耐盐能力差类型。包括１３８８．１３８１，１０３和１１７等４个无性系，只能在熟化的低产农田正常生长。     

Effect of ACQ-D Treatment on the Surface Free Energy of Chinese Fir (Cunninghamia lanceolata)

In this study, the contact angles of three different reference liquids (including distilled water, diiodomethane, and formamide) and PF resin on the surfaces of Chinese fir (Cunninghamia lanceolata) samples untreated or treated with different con- centrations of ACQ-D (ammoniacal copper quat Type D) solutions were measured. Then, the surface free energy was calculated by two approaches: acid-base approach and geometric mean approach. ACQ-D treatment caused higher contact angles and lower surface free energies at a retention level corresponding to the commodity treated wood products. When wood was treated with much higher concentrations of ACQ-D, the total surface free energy of wood would be higher than the untreated control. Acid-base/polar compo- nents related with the hydrogen bonding state in wood were considered to be responsible for the observed changes according to the applied approaches. The hydrophobic properties and also higher contact angles of PF resin drop on wood surfaces after ACQ-D treatment at a reasonable retention level confirms the changes on surface free energy.     

偃松针叶精油化学组成的研究

利用色谱－质谱联用分析方法，对偃松精油的化学组成进行了研究，共鉴定出４１个化学成分，主要有α－蒎烯（２４．７％）、β－蒎烯＋桧烯（４．３４％）、β－水芹烯（１２．６２％）、宁烯（６．９９％）、异松油烯（３．８６％）、乙酸松油酯（５．１６％）、γ－依兰油烯（１０．７２％）、大Ｍａｎｇ牛儿烯Ｂ（２．４３％）、杜松烯（９．１４％）等。偃松精油与樟子松、新疆云杉精油相比，β－水芹烯含量高达１２．６２％，而     

胡杨抗盐机理初探

对两年生胡杨（Ｐ．ｅｕｐｈｒａｔｉｃａＯｌｉｖｅ）和胡杨的杂种（密叶杨（Ｐ．ｔａｌａｓｉｃａＫｏｍ）×（胡杨＋白柳（ＳａｌｉｘａｌｂａＬ））实生苗进行５０ｍＭ和２００ｍＭ氯化钠（ＮａＣｌ）溶液的盐胁迫试验。得出胡杨的四种耐盐机制：（１）减少叶片的数量和面积；（２）叶柄肉质化（叶面积随盐胁迫的增加而减少）；（３）茎和叶片的斥盐性（高盐处理时，胡杨叶片中Ｎａ＋和Ｃｌ＋的含量只有胡杨杂种的三分之一）；（４）选择吸收Ｋ＋和Ｃａ２＋以抵抗盐离子的毒性，并保持膜的完整性（胡杨茎中Ｃａ２＋的含量随着盐处理浓度的增加而增加，叶片中Ｋ＋的含量却保持不变）。