Abstract:Taken the restoration of artificial vegetation in sandy region as background,we have studied the new pattern of spatial distribution for metapopulation in large scale,and construct the approach to simulate numerically. The simulated results show that the

Abstract:In the south of Mts Luliang,3 stands were set up at Qiaojiawan,Heihugou and Guojiawa respectively. The younger forest population of Pinus bungeana were investigated by the sampling method. 272 plots were finished. The community feature, size-class structu

Abstract:湟水流域位于青海省的东部,约处于北纬35°56′～37°38′,东经100°35′～103°05′。属于青藏高原和黄土高原的过渡地带,海拔1650～4395m,全区面积约16600km~2,属于大陆性气候和高原大陆性气候类型。本区共有野生种子植物83科、400属、1234种。分别占本区所属的青藏高原植物亚区唐古特地区总科数的92.22％、总属数的78.74％、总种数的54.00％。研究表明,湟水流域植物区系特征为:①在唐古特地区中种类相对较丰富;②温带成分占92.80％,以绝对优势确定了本区系为明显的温带性质(属于以北温带成分,特别是欧亚大陆温、寒地带典型成分为优势的,兼具温性、寒温和高寒类型的温带区系性质,或可称为在温带区系中的过渡区系所具有的“复合型”区系特征);③木本类型少,大多数种类为多年生草本植物,缺乏古老和原始类群,一些中国特有种衍生于其广布的亲缘种中,表明本区系具有年轻和衍生的性质;④我国西南高山区系和华北区系对该区系具有双重影响;⑤为青藏高原植物亚区唐古特植物地区同华北植物地区相互过渡的代表区系之一;⑥特有属和特有种少。在中国种子植物区系分区中,本区属于青藏高原植物亚区中的唐古特地区。

Abstract:滇牡丹是中国西南的特有植物，在中国植物红皮书中将其定为渐危种而列为国家三级保护植物。本研究从地理分析、生态环境、形态与遗传多样性、繁殖生物学特性、迁地保护峄滇牡丹的现状进行了评估，结果表明滇庆并不渐危：（1）拥有多样化的生态环境，对生态环境有较强的适应能力；（2）具有形态多样性与遗传多样性；（3）虽然有性繁殖较困难，但无性繁殖能力强、效率高。

Abstract:The changes of contents of H2O2,MDA and activities of several anti-oxidative enzymes such as SOD,POD,CAT and APx in the suspension cultures of two reed ecotypes-dune reed and swamp reed-under osmotic stress mediated by 20% PEG-8000 were analyzed in this w

Abstract:研究了抗旱性不同的2个品种小麦（Triticum aestivum L.)叶片质膜氧化还原系统的部分性南及其在田间缓慢干时时下氧化还原活力的变化。结果显示，2个品种小麦叶片质膜氧化还原活性的最适pH为8．0，最适温度在40℃左右，Mg^2 对其活性有刺激作用，Ca^2 对其活性没有影响。但这2个品种叶片的质膜氧化还原系统对K^ 和Na^ 的响应不尽相同：在品种定西24中，K^ 刺激作用不太明显，Na^ 有一定的抑制作用；而在品种8139中，这两种离子都有明显的刺激作用。干旱降低了小麦叶片的水势和水分含量，影响了小麦的生长发育；在缓慢干旱下，小麦叶片质膜氧化还原活力在生长发育的前期上升；在后期，其活性不变或下降，这与前人在实验室内以植物幼苗进行短期而剧烈的模拟干旱下所观察的结果不同。这种差异的原因除了与植物材料不同有关外，主要与胁迫方式及植物的发育阶段有关。

Abstract:It was investigated that variations of growth,activities of antioxidase (SOD,POD) and indole-3-acetic acid (IAA) oxidase of soybean exposed to Cd and UV-B radiation,singly and in combination. UV-B radiation, Cd2+ and in combination significantly reduced r

Abstract:Some physiologic indexes of the soil and Platycladus orientalis between the field with more frequent action of human being and the field with less action of human being at Huangdi Tomb were determined. In the field with more frequent action of human being

Abstract:Nucleotide sequence variation in the internal transcribed spacer (ITS) region of the ribosomal gene was investigated in 28 Medicago species,and Melilotus officinalis was included as an outgroup. Phylo-genetic analysis resulted in a tree in general agreeme

Abstract:通过木兰科29个种的trnL基因内含子的525个碱基序列及21个种的trnL-trnF基因间隔区的370个碱基序列测定和分析，构建的严格一致性树建议：（1）含笑属为相对一致的单系类型；（2）玉兰亚属的几个种形成一个单系类群，与木兰亚属的几个种无共衍位点；（3）木莲属为一个相对保守的类群，种间碱基差异很小。碱基位点差异分析表明：含笑和野含笑的trnL序列相对鹅掌揪有3个位点的变异和一个简单重复序列的插入；鹅掌揪的trnL-trnF序列与GenBank(AF040679)中已注册的序列有3个位点的差异。两个严格一致性树的CI值高达0．978和0．913，说明trnL内含子和trnL-trnF间隔区序列的平行演化在木兰冬这几个属间发生频率非常氏，只适于木兰科高等级的（属以上）的系统研究

Abstract:沙漠植物由于含有多糖、多酚、单宁等次生物质，要提取出质量高、纯度好的DNA比较困难。本研究以刚毛柽柳（Tamarix hispida）为材料，用高盐低pH法成功地提取出了基因组DNA，所得到的DNA片段均大于23kb ,DNA得率为225μg/g干重，A260／A280的比值在1．7－1．9之间，说明高盐低pH法对于含多糖、酚类、单要等化学物质较多的沙漠是行之有效的，研究了RAPD（随机扩增DNA多态性）技术的影响因素，摸索出适合刚毛柽柳的反应体系与扩增条件，可用于刚毛柽柳居群内、居群间遗传多样性及柽柳科其它属种分子生物学的研究。

Abstract:中国各少数民族对植物资源分类、识别、命名和保护的传统知识和实践，对植物资源的可持续发展具有非常重要的作用。民族民间对竹类植物的分类、识别、命名、利用和保护，不仅基于竹类植物的经济利用、形态特征、生活形态和生长习性，而且依赖于社会文化价值，强烈的植根于自然和社会文化环境中。此外，民族民间利用和保护竹类植物的实践，是原住民和自然资源长期相互作用的结晶，形成了非常合理和有效的可持续利用的生产系统。鉴于前期工作的基础，未来几方面的工作应得到加强：（1）调查：对中国其它偏僻地区原住民社区更多的访谈和野外调查是非常必要的，不要仅局限于种类的分类、识别和分布，而且亦要了解他们文化知识和这一重要资源的用途；（2）保护：自然资源和文化多样性保护计划和项目必须纳入国家项目，并要结合对各个民族类群的特别建议。不同利益集团的介入和合作也是必要的。（3）技术传播：某些现代的管理和技术能改进资源利用效率，增加原住民社区收入和促进这些社区福利的改善。（4）就地保护和迁地保护资金的支持：竹类遗传资源的保护对于未来可持续生产是非常重要的，但亦是困难的，这往往是资源多样化、文化多样性，特别是资金激励体制导致推行策略的复杂性。

Abstract:This paper collects and sorts a series of Xinjiang endemic species datas which add up 268 species in 118 genera of 38 families. So far the result is the first report about Xinjiang endemic species. It can help for investigating Xinjiang flora characterist

Abstract:The chosen type and seed region were selected by the method of analyzing the contents of multi-constituents in leaves Eucommia ulmoides. Elite trees were selected,clones were reproduced and clone test stand were established based on this method. 14 chosen

Abstract:Germplasm lines Shandong 87074-526 and Shandong 87074-551 with powdery mildew resistance, which came from the progeny of Elytrigia elongatum (2n = 70) and common wheat,were identified by cytology, RAPD and resistance analysis for powdery mildew. The resul

Abstract:利用花粉管通道技术对国槐DNA导入花生栽培品种79266，D2代变异株98D010－7经连续自交，D3代获得9个株系，61个株行，641个单株，观察D5代群体内每个单株的开花型、株型、主茎高、第一对侧枝长、分枝数及单株结果数等主要农艺性状的表现型。结果表明：（1）79266和98D010－7均为连续开花型，D5代出现了交替开花型变异株，占总株数4．37％，开花型分离株行占16．39％；（2）79266株型直立，98D010－7株型葡匐，D5代表现型有直立，葡匐和半葡匐3种类型，分别占34．95％、14．04％和51．09％；表现分离的株行占73．77％；（3）株高和第一对侧枝长与79266相比显著降低；（4）单档分枝数与受体平均值相近，只有1个株系分枝数显著少于受体79266，其它8个株系差异不显著；（5）D5代群体有3个株系的单株结果数显著大于受体79266的单株结果数。

Abstract:以武夷山国家自然保护区核心区天然毛竹林为研究对象,应用生物量优化模型对天然毛竹林生物量、能量的分配规律进行研究,结果表明:①毛竹天然林生物量按组分秆、枝、叶、竹蔸、鞭根的分配规律为5585.956、1120.456、387.453、1148.785、2827.099g·m~(-2),所占比例依次为50.46％、10.12％、3.50％、10.38％、25.54％,能量现存量按组分分别为112171.60、21694.0、7532.8、21796.8、52089.3kJ·m~(-2),所占比例依次为51.70％、10.00％、3.47％、10.05％、24.78％;②毛竹天然林生物量按龄级Ⅰ度、Ⅱ度、Ⅲ度、Ⅳ度、Ⅴ度及以上竹的分配规律为2151.845、1799.441、1184.757、1010.021、4923.684g·m~(-2),所占比例依次为19.44％、16.26％、10.70％、9.12％、44.48％。能量现存量按龄级分别为47465.97、40232.99、26502.84、17737.74、102488.8kJ·m~(-2),所占比例依次为20.25％、17.16％、11.30％、7.57％、43.72％。在此基础上,将毛竹天然林与人工林进行了比较分析。且为毛竹林的丰产培育提出了科学依据。

Abstract:Studies on the developmental anatomy of rhizome in Dioscorea zingiberensis C. H. Wright have been done with the paraffin method. The biennial rhizome of D. zingiberensis is composed of three parts: the periderm,the ground tissue and the vascular bundle. T

Abstract:Cellular ultrastructural changes of the leaf in response to high temperature and drought stress in winter-lawn grass Agrostis stolonifera and Lolium perenne were investigated. The results showed that the cell ultrastructure changed significantly. Chloropl

Abstract:Effect of phytohormone ABA and 2,4-D on tissue culture of Physalis pubescens was investigated. The results showed that 1. 0 mg/L 2,4-D was the best concentration for callus induction and for the increment of fresh callus weight. Among cotyledon,petiole of

Abstract:Comparison researches of dormant underground buds of Paeonia rockii were carried out in the following aspects,such as state of development in the three MS media,effects on dormant underground buds after low temperature treatment in different length time a

Abstract:Kanamycin inhibits the formation and the proliferation of Stachys sieboldii callus. With the increase of Kanamycin concentrations,the frequency of callus formation and the increase of weight are lower. The sensitivity of leaves and stems is different and

Abstract:After Chinese-fir rhizosphere soil was extracted by propanone mixed with ethanol equally and concentrated in vacuum at room temperature,allelopathic effect of extractor on Chinese fir seed germination was done in this paper. The results showed that three

Abstract:The contents of aloe-emodin,rhein,emodin and chrysophanol in various parts,e. g. root,stem,leaf blade and petiole,of Rheum Tanguticum,R. undulatum and R. spiciforme were investigated with HPLC and were quantified with external standard method. The results

Abstract:A standard test method was applied to evaluate the toxicity of chemicals to algae;and inhibitory effects of 96 h median effective concentration (96 h-EC50) of eight kinds of commonly used dyes on the growth of Scenedesmus obliquus were calculated using th

Abstract:C-band polymorphism in five tetraploid (2n = 4x = 28) wheat (Triticum turgidum L. ) landraces was studied. Qinghaifoshoumai,Gansufoshoumai, Wuzaolong, Jiutoumai and Heimangbaimai,which show C-band polymorphism on some chromosomes,share unusual terminal ba

Abstract:The tissue culture and plant regeneration of notholirion bulbuliferum were studied in this paper and the result showed that;the calli could be induced from bulbule on the MS basicl mediums supplemented with different concentration of KT,BA,IAA,NAA and 2,4

Abstract:虎舌兰属(Epipogium Gmelin ex Borkhausen)隶属于兰科(Orchidaceae)树兰族(Epidendreae),为一寡种属,分布于欧亚大陆、亚洲热带、非洲热带和大洋洲等地区。本属植物有3种,俱为腐生草本。

Abstract:Systematic and Evolutional Botany,whose main field is the plant comparative anatomy,is one of the important subjects among the modern plant science. According to the statistics of main journals about late 50 years in our country,our phytologists pay atten

Abstract:This paper reviewed strategies and recent progress in antifungal transgenic plants. These include expressing hydrolytic enzymes which target fungal cell wall, expressing pathogenesis-related proteins which either hydrolyze cell wall or inhibit fungal grow