Abstract:子午岭林区的北部，地貌上具有黄土陵沟壑的特点。该区植被的演替序列为；从弃耕地先锋群落开始，经草本，灌木群落时期到早期森林群落山杨IPopulus davidiana)林或白桦（Betula platyphylla)林、侧柏（Platycladus orientalis)林等。进而到后期森林群落辽东栎（Quercus liaotungensis)林或油松（Pinus tabulaeformis)林。的50年来，油松林和侧柏林已经或正完成向辽东栎林方向的发展，山杨林、白桦林和侧柏林为该区演替系列中的过渡时期，气候性的演替顶极为辽东栎林，油松林为亚顶极，同时该区还表现出整体向前发展的趋势，这明显体现在原来林区大部分为山杨林，而现在辽东栎林已取代山杨林成为主要林分，只有阳坡下部基岩露出的陡壁上的侧柏林仍无向前发展的征象，为该区的一种局部土壤性演替顶极，阴坡，半阴坡从草本群落到顶极的演替全过程需要约150a，阳坡，半阳坡从草本群落演替到顶极但不包含油松林阶段（目前尚缺少这一阶段）需要150a左右，梁顶部位的演替速度与阴坡，半阴坡大致相近，从植被的类型，分布和演替来看，该区在植被区划上应属于暖温带北部落叶栎林亚地带。

Abstract:The characteristic of clonal plant, Potentilla anserina were studied in alpine Kobresia humilis meadow by investigation and statistics in this paper.The results are as followed. P.anserina with one stolon is the most and its proportion is 52.86%

Abstract:对新疆古尔班通古特沙漠南缘土壤结皮中苔藓进行了研究。结果表明，该地区参与土壤结皮的有4种苔藓植物，即真藓（Bryum argentum)、细叶真藓（Bryum capillare)、无齿紫萼藓（Grimmia anodon)和垫状紫萼藓（Grimmia puluinata)，并分析了其耐旱特性和分布特征；研究发现该地区苔藓结皮呈层片分布规律，由表及里依次为苔藓植物层，无机沙砾层1、藻结皮层，无机沙砾层Ⅱ等4层。

Abstract:There are 82 families 484 genius 1704 species seed plants and obvious dominant phenomenon in West North Desert of China.There are 11 dominant families (Compositae?Leguminosae?Graminaea?Chenopodiacea?Cruciferae?Polygonaceae?Cyperaceae?Ranunculaceae?Rosac

Abstract:A new map of area of Potaninia was drawn,interpreted basic law and character of ecological geographic distribution of Potaninia and defined floristic geographic element of Potaninia as "Alashan East Gobi" element.

Abstract:报道了桦木科和樟科共20种植物在我国11个省区中的分布新记录，其中西藏分布新记录的有柱果琼楠、钝叶桂，更是山胡椒、假辣子、钝叶木姜子、黄心树，粗壮润楠和瑞丽润楠；云南分布新记录的有巫山新木姜子；广西分布新记录的有黄心树；甘肃分布新记录的有大叶木姜子；陕西分布新记录的有猴樟，山西分布新记录的有秦岭木姜子；河北分布新记录的有岳桦；浙江分布新记录的有桂北木姜子；福建分布新记录的有广西新木姜子；江西分布新记录的有尖叶木姜子、华南木姜子和凤凰润楠；湖南分布新记录的有披针叶榛和四川新木姜子。

Abstract:To detect Elymus rectisetus chromation transferred to wheat, E.rectisetus ,Fukuhokomugi ( Triticum aestivum ) and 72 plants of 16 BC 2F 5 derivatives (wheat/ E.rectisetus //wheat) were used for RAPD analysis with 12 arbitrary primers (all oper

Abstract:Forty five individuals from six natural populations and two cultivars were used in RAPD analysis.Seventeen primers produced 101 bands in total,81 out of which were polymorphic.The percentage of polymorphic loci was 80.2%,which was higher than that of oth

Abstract:The purpose of the experiment is analysis the expression of PvLEA 18 like during germination by using polyclonal antibody to PvLEA 18.The results showed that two protein bands are detectable in embryo and scutellar tissue of germinating seeds at variou

Abstract:Effect of lighting on the Biosynthesis of Alkaloid in the calli from the explants of roots of Saussurea medusa Maxim,was investigated.The results showed that the content of total Alkaloid in cell culture was less than that of wild Saussurea medusa Max

Abstract:The factors which influenced somatic embryogenesis and plantlet regeneration in Picea meyeri Rehd.et Wils.were studied in order to establish a high frequency embryogenetic system.It was showed that supplementation 50 g/L PEG (Polyethylene glycol) to the

Abstract:研究了 5 0 mg· L- 1真菌诱导子 (F5) ,5 0 mg· L- 1水杨酸 (SA) ,5 0 mg· L- 1F5+5 0 mg· L- 1SA3种处理 ,对红豆杉悬浮细胞膜脂过氧化和紫杉醇合成的影响。结果表明 :F5和 SA单独处理红豆杉细胞均引起细胞膜脂过氧化。SA+F5联合处理可以减轻 F5单独处理细胞所引起的膜脂过氧化程度 ,SA+F5联合处理与真菌诱导子处理相比 ,较大地提高了过氧化物酶的活性 ,得到较多的生物量。3种处理方法均可提高红豆杉细胞紫杉醇产量 ,特别以 F5+SA处理得到产量最高 ,达到 1 1 .5 mg· L- 1,分别为 F5,SA和对照组的 1 .5倍、2 .0倍和7.5倍。结果显示 :在真菌诱导子诱导与水杨酸的联合作用下提高紫杉醇产量 ,可能与水杨酸减轻真菌诱导子所引起的细胞膜脂过氧化程度有关

Abstract:When calluses of Lycium barbarum L. were transferred into differentiation medium the putrescine content rapidly increased and reached to the first peak,then droped relatively .The putrescine content increased again and arrived at the highest peak (six t

Abstract:The study was to determine relative contributions of genotype, environment and genotype by environment interaction to variation in protein quality property of winter wheat variety,by the datum analysis of twelve winter wheat genotpyes at thirteen location

Abstract:Characteristic of sulfur absorption of HOM,HSM and effects of sulfur amount applied on their kernel quality and yield were studied.Results indicated that sulfur absorption in period before flowering was 57.53% of the total sulfur absorption.There was bigg

Abstract:By using the way of gray correlation degree,this study analyzed the gray correlation coefficient,correlation degree and correlation order among seven main characters in 20 groups of parents and hybrids of two-row hulled malting barley.The results showed t

Abstract:The membranous aril contains outer epidermis,inner epidermis and multiple layers of parenchymatous cells between them.The blackish brown clored seed coat comprises exotesta,mesotesta and endotasta.The exotesta contains only one layer of epidermal cells.Th

Abstract:The potted plants of Suaeda salsa were respectively treated with different concentration of NaCl solutions.Inorganic ions content,selectivity of K over Na of old leaves,young leaves and roots were measured and compared.Na + and Cl - content of leaves

Abstract:A wheat- Th.intermedium addition line,which was yellow rust resistance,was found to be homoeologous to group 7 based on endopeptidase isozyme analyses.A specific band was found in partial amphiploid Zhong 4 awnless,addition line C076,but not in wheat lin

Abstract:Based on the Ephedra cultivation research in the soil of SO 2- 4 and Cl -,the result shows that Ephedra plant grows better when the soil salt content is less than 1.2% in the layer of 0~30 cm and its ephedrine is improved through the chemical ana

Abstract:The development of the radicle of no-primary-root type seedling of Nelumbo nucifera was reported.The radicle converted from meristem into storage tissue,so the radicle didn't break through the seed coat.The sieve element of the primary vascular system o

Abstract:The root-tip meristematic cell nuclei of common wheat were studied by using conventional and the "en bloc" silverstaining TEM techniques.It was found that there were nucleolar channel structures between nucleolus and condensed chromatin.It can be inferred

Abstract:Arbuscular mycorrhizal(AM) fungi can establish a good symbiotic relationship with tobacco roots, thus facilitate its growth and improve quality of the host. It is an impending problem to ascertain whether spraying agricultural chemical has effects on the

Abstract:By studying the geographical distribution of Oat,by investigating its situation of the planting and utilization,this paper would be helpful to developing utilization of the resources and the selective breeding of Oat varieties in Qinghai Province.

Abstract:In this experiment,blackseed pumpkin ( Cucurbita ficifolia ) was used as rootstock and Jinyou No.1 (CK 1) and Nongcheng No.4 (CK 2) were two scions,the growth situation of these grafted cucumber seedlings were studied.The results showed that the average

Abstract:Under the condition of field cultivation,the effects of soaking seeds with DPC (1,1-dimethyl piperidium chloride) on the physiological functions of root system and leaf of peanut ( Arachis hypogaea L.) seedlings were studies.The result indicated that DPC

Abstract:This article reviews the recent research advances of floral formation (including floral induction,identification of inflorescence,floral evocation and floral morphogenesis) in plants (taking example by Arabidopsis and Antirrhinum ).The research achieve

Abstract:Based on the research progress in iron untrition of plant,the mechanism of iron uptake and transport by plant and the effect of HCO - 3,N,P on iron use efficiency were discussed.

Abstract:The lastest development about regulation and controlling gene of ACO and ACS,etr-1 and regulation and controlling factors of alcohol,DPSS,acetaldehyde,and colt was review ed in this paper.

Abstract:The application of rare earth compounds on polymer,including being used as catalyst,fluorescent or lasering material,magnetic polymer,filler or modifier,stabilizer and so on,were reviewed.

Abstract:The topic selection structure arrangement and the common erros in botany research papers.It also demonstrates the basic styles in paper writing and the approach to impore the writing skills.

Abstract:This article deals mainly with the formation and dissolution of storage materials in the cotyledon cells of watermelon ( Citrullus lanatus L.).At 20 DAF(day after flowering),electron microscopic studies reveal that big vacuoles are subdividing into two t

Abstract:Observed in the present paper are the pollen characteristics under SEM of 8 species in Farfugium,Ligulariopsis and related taxa in the Senecioneae.The pollen grains in all taxa investigated have spiny exine ornamentation.However,among the \{taxa\},the

Abstract:In this paper,surface features of seeds on 8 species in Tripterospermum and 6 species in Crawfurdia were observed under scanning electron microscope (SEM).Finely reticulate seed surface was existed in T.cordatum,T.volubile,T.chinense,T.discoideu