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Journal of Systematics and Evolution 2009年第3期47卷 220-225页

作者： Qin-Wen LIN Zhi-Xiang ZHANG (College of Biological Sciences and Biotechnology, beijing forestry university, beijing 100083, China) (College of Biological Sciences and Biotechnology Beijing Forestry University Beijing 100083 China)

Microtropis macrocarpa C.Y. Cheng & T.C. Kao has been treated as a synonym of Microtropis macrophylla Merr. & Freeman in most taxonomic reports in China. According to our study, M. macrocarpa is an independent species endemic to Yunnan, China. Microtropis macrophylla and Microtropis pachyphylla Merr. & Freeman should be treated as synonyms of Microtropis longifolia Wall. ex Kurz. M. macrocarpa is also identified as a critically endangered species, CR B1ab (i,ii,iii,v), based on the IUCN Red List Categories and Criteria. The foliar surface, anther and pollen structures were also observed with a scanning electron microscope.

关键词： Celastraceae foliar epidermis IUCN Red List Microtropis pollen.

Studies on the Characteristics of Foliar Surfaces of Hippophae and Related Taxonomy

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北京林业大学学报 1992年第S2期14卷 64-69页

作者： Zhang ZhixiangForest Resources College, beijing forestry university

Trichome forms and stomatal distribution and types were undertaken. The results show that trichome forms are stellate, peltate and stellate-peltate. There is a difference in the position of stomata among the taxa of Hippophae. H. thibetana, H. salici-folia. H. gyantsensis, H. neurocarpa and H. rhamnoides ssp. turkestanica have stomata on both foliar surfaces, while other subspecies have stomata only on the lower surface. Stomata are of the Actinocytic type.

关键词： Hippophae. trichome stomata epidermis

Effects of Water Stress on Tissue Elasticity in Nine Tree Species

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北京林业大学学报 1992年第S2期14卷 25-32页

作者： Li JiyueForest Resources College,beijing forestry university

The experiments were carried out under the conditions of controlled soil water potential in a greenhouse. The effects of water stress on tissue elasticity were studied in 1 - 3 year-old seedlings Pinus tabulaeformis, Platycladus orientalis, Quercus variabilis, Acer truncatum , Robinia psendoacacia, Fraxinus americana , Amorpha fruticosa, Hip-pophea rahmnoides and Cotinus coggygria ,using the pressure-volume method. Tissue elasticity was characterized using graphs of the modulus of elasticity plotted as a function of turgor pressure and maximum values of the elastic modulus. Changes in tissue elasticity may be an important characteristic allowing low water potentials to be reached and maintained without the development of detrimental water stress. The results show that tissue e-lasticity in needle-leaved tree species is higher than in broad-leaved tree species,but the modulus of elasticity of the tree species tend to increase following development of water stress. Increases in elastic modulus

关键词： water stress water potential turgor elastic modulus pressure-volume

Choice of Species in China's Plantation forestry

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北京林业大学学报 1992年第S2期14卷 15-24页

作者： Shen GuofangForest Resources College, beijing forestry university

This paper reviews the new developments in the choice of tree species for China’s plantation forestry in relation to forest regionalization and site classification. After a brief discussion on the fundamental principles of choosing species,it gives the statistical data of the species composition of established forest plantations and recommendation for suitable tree species for plantations in some important forestry regions. Results of studies in 3 different cases have been given to illustrate the research approach in choice of tree species in accordance with the planting sites.

关键词： choice of species forest regionalization site classification

Wild Alpine Flower Germplasm Resources of the Changbai Mountain Nature Reserve

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北京林业大学学报 1993年第S3期 83-89页

作者： Su Xuehen College of Landscape Architecture,beijing forestry university

The nature reserve of Changbai Mountain was established in 1960. It is known for its richplant germplasm resources , among them the wild alpine flowers are most interesting germplasm resources inthis rich alpine vegetation pool. From June to July,Rhododendron chrgsanthum Pull,*** Maxim,ft. confertissimum Nakai, Phyllodoce caerule ( L. ) Babingt, Vaccinium vitisidaea L. , Dryas daerulea (L. )Babingt,Polygonum laxmanni Lepech,P. viviparum L. , P. ochotense V. Peter. ex Kom. grow profusely. Becauseof the special natural environment of Changbai Mountain, many endemic wild alpine flowers grow naturally,such as Minmartia macrocarpa (Parsh)Osterf,Papaver psendoradcatum Kitag, Geranium paishanense Y. ***, Gentiana james Hemsl, Oxytropis anertii Nakai and Hedysarum ussuriense. I. Schischk. All of thesespecies could be used in rock gardens.

关键词： wild alpine flower plant germplasm resource natural reserve

Root Growth Potential and Energy Sources for New Root Growth of Three Conifer Species in Northern China

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北京林业大学学报 1993年第S3期 10-22页

作者： Liu Yong Forest Resources College,beijing forestry university

Seedlings of Pinus sylvestris var. mongolica, Larix principis—rupprechtii and Platycladus orientaliswere lifted from the nursery in March and transplanted to favorable growing conditions in a controlledenvironment chamber. The test of RGP showed that Platycladus orientalis seedlings had the greatest RGP amongthe three species, any one of the four parameters as TNR, TNR>1, TLR>1 and SAI could representthe RGP of Platycladus orientalis. However, at least two parameters (TNR and any one of TNR>1,TLR>1, SAI)must be used to represent the RGP of Larix principis—rupprechtii and Pinus sylvestris *** seedlings due to the weak correlation between root initiation and root elongation for the twospecies. The results of the RGP test and carbohydrate analysis for different treatments demonstrated thatcurrent photosynthate is needed for new root growth in Pinus sylvestris var. mongolica seedlings, whereasstored-carbohydrates provided the energy source for new root initiation. Current photosynthate is also neededfor root elongation in Larix principis — rupprechtii seedlings; New root growth of Platycladus orientalisseedlings is primarily caused by current photosynthate, but some reserve materials may be utilized at thesame time if photosynthesis is inadequate to meet growth demands.

关键词： root growth potential(RGP) current photosynthate stored carbohydrates

Studies on Topophysis in Seedlings and Suckers of Populus tomentosa Using Tissue Culture and Cutting

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北京林业大学学报 1993年第S3期 23-30页

作者： Fu Jianming Forest Resources College,beijing forestry university

Different segments of seedings and suckers of Populus tomentosa were propagated using methodsof tissue culture and cuttings. Vegetative propagation abilities of different segments are compared . Thepurposes of this research are to determine whether topophysis exists in seedlings and suckers of Populus tomentosa,and to probe the change in patterns of topophysis. The results show that the callus weights,the differentiationrates of shoots and rooting rates which are major characteristics of expressing propagation abilitiesin tissue culture are apparently different and have an increasing trend with the decrease of the positionsfrom which the explants are taken. The rooting rates of cuttings have the same trend. These results demonstratethat there is topophysis in the seedlings and suckers and that topophysis patterns are the same as thoseof mature trees.

关键词： tissue culture seedling sucker topophysis Populus tomentosa

A Study on Mechanisms of Drought Tolerance in Tree Species

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北京林业大学学报 1993年第S3期 1-9页

作者： Li Jiyue Forest Resources College,beijing forestry university

According to ways of responding to drought stress,two primary types of drought resistance intree species have been identified: (1)drought escape; (2)drought tolerance (including dehydration postponementwith high tissu... 详细信息

关键词： drought drought tolerance water stress water potential turgor pressure osmotic adjustment

Plant Hardiness Zones of China

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北京林业大学学报 1992年第S2期14卷 90-92页

作者： Chen YouminDepartment of Landscape Architecture. beijing forestry university

China has been divided into eleven plant hardiness zones based on average annunal minimum temperatures.

关键词： hardiness zone minimum temperature isohyet

Sylvo—pastoral Systems in China

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北京林业大学学报 1993年第S3期 90-102页

作者： Wang Xian College of Soil and Water Conservation,beijing forestry university

This is a bief analysis of the natural conditions of the the grassland resources in China, thespecial features of sylvo—pastoral systems, and the prospects for the development of both. The feed valueof woody plants, and the state of their utilization for sylvo—pastoral systems is specified in the present productionalmodel in China. The discussion is mainly concerned with the characteristics and significance ofshrub forest for forage. This paper stresses the all —round development of agriculture, forestry and animalhusbandry, and discusses the concrete forms of sylvo — pastoral systems including utilization of branchesand leaves, grazing and grass sowing in forestland, development of shrub forests for forage and cultivationof arbor—tree species in the form of shrub.

关键词： sylvo—pastoral systems shrub forest for forage plant resources