Growth and Dynamics of a Phellodendron amurense Rupr．Forest in Northeast China

ＧｒｏｗｔｈａｎｄＤｙｎａｍｉｃｓｏｆａＰｈｅｌｌｏｄｅｎｄｒｏｎａｍｕｒｅｎｓｅＲｕｐｒ．ＦｏｒｅｓｔｉｎＮｏｒｔｈｅａｓｔＣｈｉｎａＬｉＪｕｎｑｉｎｇＣｏｌｌｅｇｅｏｆＦｏｒｅｓｔＲｅｓｏｕｒｃｅｓａｎｄＥｎｖｉｒｏｎｍｅｎｔ，ＢｅｉｊｉｎｇＦｏ...     

Effects of Pruning to Promote Trunk Extensionon Annual Growth Rhythm of Paulownia

TreesgrowthregularityandtheirannualgrowthrhythmareusuallysimulatedandanalyzedbyRichardsequation(TangShouzheng,etal,1999;RichardsJ,1959;WangMingliang,etal,2000).However,previousstudiesonPaulowniaannualgrowthrhythmhavebeenlaidparticularstressonseedlingscultureandyoungplantletselectionofclonesbutlackofrelevantstudyonwoodcycles(ZhaoDaning,etal,1993;FuDali,etal,2001;ZhouYongxue,etal,1996).ThenaturaltrunkextensionanditsstraightnessofPaulowniaarerestrictedprodigiouslybycharacteristicsofpseudo-d…     

Response of Somatal Characteristics and its Plasticity to Different Light Intensities in Leaves of Seven Tropical Woody Seedlings

1 INTRODUCTIONAs an important structure in the leaves of terrestrialplants, stomata play a key role in the gas exchangebetween plants and atmosphere, and provide the mainchannels of water dissipation for plants. They also playa significant part in the regulation of photosynthesisand evaporation process. Researches have long beenconducted on stomata, and one of the most importantfields in plant physiological and ecological research isconcerned with the physiological and ecologicalcharacteri…     

Response of seedlings of different tree species to elevated C02 in Changbai Mountain

Eco-physiological responses of seedlings of eight species,Pinus koraiensis, Picea koraiensis, Larix olgensis, Populus ussuriensis, Betula platyphylla, Tilia amurensis, Traxinus mandshurica andAcer mono from broadleaved/Korean pine forest, to elevated CO₂ were studied by using open-top chambers under natural sunlight in Changbai Mountain, China in two growing seasons (1998–1999). Two concentrations of CO₂ were designed: elevated CO₂ (700 μmol·mol⁻¹) and ambient CO₂ (400 μmol·mol⁻¹). The study results showed that the height growth of the tree seedlings grown at elevated CO₂ increased by about 10%–40% compared to those grown at ambient CO₂. And the water using efficiency of seedlings also followed the same tendency. However, the responses of seedlings in transpiration and chlorophyll content to elevated CO₂ varied with tree species. The broad-leaf tree species were more sensitive to the elevated CO₂ than conifer tree species. All seedlings showed a photosynthetic acclimation to long-term elevated CO₂. Foundation item: The project was supported by National Key Basic Development of China (G1999043400) and the grant KZCX 406-4, KZCX1 SW-01 of the Chinese Academy of Sciences Biography: WANG Miao (1964-), maie, associate professor in Institute of applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P. R. China. Responsible editor: Song Funan     

Inhibitory Effect of Garlic, Clove and Carrot on Growth of Aspergillus Flavus and Aflatoxin Production

INTRoDUCTIONANatoxinsarctoxicsccondarymctabolitCspro-ducedbyAsPergillus~s,A.parastticusandA.nomius(Kurbzmanetal,l987).ThescfUngicangrowreadilyonawidevarictyofagriculturalconunoditicsandPoschealthhazardtobothhumanandanimals.ANa-toxinsareacutClytoxic,carcin…     

不同施肥处理对美国红橡木幼苗生长的影响

对红橡木幼苗进行了不同施肥处理试验,结果表明:施肥显著促进红橡木苗高和地径生长.不同处理比较,T4处理(基质拌入1%NPK复合肥)最好,其苗高、地径均较大,分别比对照高39.3%和33.3%,T1(N肥)处理次之,其苗高、地径比对照高28.6%和27.4%.不同施肥处理对红橡木苗高和地径生长的影响效应从大到小的顺序为:...     

Research advances in allelopathy of Quercus L.

The term allelopathy refers to biochemical interaction between all types of plants including microorganisms through pro-duction of chemical compounds that escape into the environment and exist widely in Quercus L. The development of investigations into types of allelochemicals, their compounding and spreading pathways, as well as expression of allelopathy in Quercus L. are re-viewed in this paper. We have closely and systematically emphasized the functional mechanisms of allelopathy in forest plants for our next research project on allelopathy in Quercus L.     

光周期与光质对栎属幼苗生长及叶绿素荧光的影响

[目的]通过探讨光周期与光质对栎属(Quercus L.)植物幼苗生长及对幼苗叶片光化学反应的影响机制,为栎属植物育苗壮苗及人工辅助更新提供科学参考.[方法]以栎属植物幼苗(3栓皮栎种源?+?1蒙古栎?+1短柄枹栎)为研究对象,通过调控人工LED光源的方式,研究3种光周期(日夜时长分别为10?h/14?h,14?h/1...     

栎属天然林的遗传结构和遗传多样性研究

利用聚苯酰烯胺凝胶电泳技术检验了栎属6个群体在7个同工酶位点(Got-1、Got-2、Shdh、Aap-1、Aap-2、Pgi、6Pgd)上的遗传变异(多态位点百分率为93.3%,等位基因平均数2.806,平均预期杂合率为0.346)。基因分化系数为0.394,表明居群变异的39.4%出现在居群间,60.6%出现在居群内,各居群间的遗传距离为0.0206～0.6411。初步的研究表明:其丰富的遗传变异可能与其生境的多样性、风媒异交等因素造成的长距离的基因漂变有关。     

蒙古栎播种苗生长规律及养分状况

通过对蒙古栎播种苗生长规律及养分状况的分析,结果表明,蒙古栎播种苗高生长加速期有2个高峰期,分别为第20~40天和第60~80天。地径生长量高峰期分别为第20~40天和第100~120天。叶片和茎的氮、磷养分积累表现为生长前期较高而后期较低。钾养分积累表现生长前期较低而后期较高。可依据苗期养分状况进行肥水管理以提高苗木质量。     

麻栎菌根化幼苗对水分胁迫的响应

水分胁迫下,将麻栎接种菌根化幼苗与未接种苗进行耐旱性对比试验.结果表明,随着水分胁迫的加剧,接种菌根化幼苗比未接种苗的土壤含水率、光合色素含量、硝酸还原酶活性、幼苗含水率、根系活力下降幅度低,但根系质膜相对透性和丙二醛含量上升幅度前者比后者小.此结果说明菌根化幼苗比非接种苗抗旱性强.     

垂柳生长状况调查初报

通过对安溪县凤城镇和福田乡两个气候差异大的地点,对种植的垂柳进行生长状况比较,调查其成活率、保存率和发生病虫害的情况以及垂柳的生长环境,把两个地方的气候与苗木来源地的气候进行比较,结果表明:全年温度≥10℃天数较多的凤城镇,垂柳生长过程中更易发生病虫害,可见福田乡比凤城镇更适合种植垂柳。     

中国沙棘克隆生长对不同光照强度的响应

利用遮阳网产生的不同光照强度（100％、70％、50％和20％的自然光照）,研究了中国沙棘克隆生长对不同光照强度的响应规律。结果表明,（1）当光照强度从20％逐渐增加到100％时,种群生长量、生物量积累与分配、地下克隆器官参数等增幅均呈二次抛物线变化,相对光照强度为50％～70％是其克隆生长的最佳光照强度。（2）种群生长量、种群及各器官生物量、子株数量及萌蘖根生长量增幅最大时的光强分别为48.0％～61.7％、52.8％～53.6％、55.6％～57.6％,且分株生长量和种群生物量、萌蘖根生长量和子株数量之间具有协同作用,而营养生长和克隆繁殖之间存在权衡关系。（3）在适宜的光照强度下,种群以分株比较高大且分布相对密集为特征,生长格局倾向于集团型;在光照强度过大或过小的情况下,种群以分株比较矮小且分布相对稀疏为特征,生长格局倾向于游击型。当光照强度由低到高变化时,生长格局将由游击型到集团型再到游击型,形成一个觅养对策连续体。     

2种种子处理方式对蒙古栎苗木生长的影响

蒙古栎作为一种适应性强树种,在辽西地区都有种植,但是由于其生长缓慢,导致数量不多。文章以辽宁阜新的蒙古栎种子为对象,通过两种种子处理方法来探讨对苗木生长的影响。结果表明,去芽法处理的种子能很好促进苗木的生长,而多芽法处理的种子对苗木的生长起到了抑制的作用。     

暖温带北缘3种栎树径向生长对气候要素的响应差异及预测

目的 比较同一气候区不同栎类树种生长对气候要素的响应差异,特别是在分布边缘不同树种的种内种间差别。 方法 利用树木年轮学方法,分析了我国暖温带北缘3种优势落叶栎树（蒙古栎、栓皮栎和麻栎）径向生长对气候要素的响应差异;同时利用混合线性效应模型构建了3个树种径向生长与气候的关系,并基于未来气候情景（RCP2.6和RCP8.5）预测了其未来生长趋势。 结果 同一地区栎类树种年表具有较高的相似性,而不同地区间差异较大;在径向生长对气候响应方面,同一地区的不同栎类树种和不同地区同一栎类树种也存在一定差别。其中北京地区的3种栎类树种的径向生长与当年6月气温呈负相关关系,但在辽宁仙人洞地区却与气温无显著相关关系;北京地区的麻栎、河北地区的蒙古栎、辽宁大黑山地区的栓皮栎的径向生长均受降水条件限制。模型预测显示,至本世纪末,北京地区和辽宁大黑山地区栎类树种的径向生长呈现下降趋势;而辽宁仙人洞地区栎类树种径向生长呈增加趋势。 结论 我国暖温带北缘不同地区的栎类树种对气候要素的响应存在显著差别,主要为取样地区的气候所支配,下一步尚需结合林分及立地因子,来厘清各类环境要素的相对贡献度。