Showing papers in "Guizhou Science in 2005"

A new subspecies and a new record of rhododendron in guizhou

Abstract: In this paper, a new subspecies of the subsection Triflora (Hutch.) Sleumer of the genus Rhododendron is proposed, R. zaleucum Balf. f. et W. W. Smith subsp. lepidofolium Xiang Chen et Xun Chen subsp. nov., and the Guizhou distribution of the species, R. zaleucum Balf. f. et W. W. Smith, is also discussed. One species of the subsection Lapponica (Balf. f. ) Sleumer,R. impeditum Balf. f. et W. W. Smith, is reported for the first time for the flora of Guizhou.

Research on resources of the medicinal plant of cruciferae and leguminosae in guizhou

Abstract: The species and geographic distribution of the medicinal plant of Cruciferae and Leguminosae in Guizhou were comfirmed,basing on open-air investigation,collection specimens,samples identification,date collection and reference informationAnd correction on medicinal species,their geographic distribution and Latin scientific names were madeThe results show that 30 species(including 2 varieties) of the medical plants of Leguminosae,180 species(including 8 varieties) of the medical plant of Cruciferae in Guizhou have been foundAmong them,1 species is new record of the distribution,34 species are new medicinal resources,1 species is endemic medinical plantOn the other hand,5 species are wrong records and Latin name of 19 species are Latin different name in "Medicinal Material Resources of Guizhou"

A study on litter layer and holding capacity in soil of rhododendron delavayi forest

Abstract: The effects of litter layer and forest soil on the water source conservation are studied when the hydrological effects of by investigating and analyzing the forest soil and litter layer in the R delavayi forest are analysed in Bailidujuan Pudi town in Dafang county ,Guizhou The results show that the maximum water holding capacity of the undecom posed litter in R delavayi forest is 260% of its dry weight, the maximum water holding capacity of the half- undecomposed litter in R delavayi forest is 283% of its dry weight , And the equation of the water ABSorption speed of in the litter layer and the immersing time is Y=kt~(n) The density of soil of the A layer is 088gcm~(-3 ),the maximum water holding capacity is 6087%, the capillary holding capacity is 427%,and the field holding capacity is 2327% those items of the secondary Quercus acutissima forest soil are respectively 11gcm~(-3),4043%,2973% and 2550% The density of soil of the B layer is 111gcm~(-3 ), the maximum water holding capacity is 4187%, the capillary holding capacity is 3353%,and the field holding capacity is 1858%

Study of guangxi biodiversity and its protection

Abstract: Tan Weifu (Guangxi Forestry Survey Design Institute Nanning 530011) ABStract: With complicated natural environment, Guangxi has extremely abundant bio-diversity of global significance, which position and function are irreplaceable. However, affected by many kinds of factors, the bio-diversity of Guangxi is facing more and more serious threat, thus the protection work of bio-diversity is very arduous. In this paper, firstly, the author fully describes current situation of Guangxi biodiversity according to his protection practice on nature for many years; secondly, the author proposes protection suggestion. Aim of this paper is to offer opportunity to people with more understanding about Guangxi biodiversity, subsequently, attracting more attention and support. Through this way, Guangxi biodiversity with global significant could be impelled to play a role of global influence at the same time.

The ecologlcal of the macrofunci in mt.dashahe of guizhou, china

Abstract: The Dashahe is rich in macrofungi resources. We collected more than 600 series of specimens of macrofungi in the Dashahe area of Guizhou Province, The preliminary study show that all of them can be divided into 47 families, 95 genera, and 208 species (including var. species ). Basidimycotina has 186 species, Ascomytina consists of 22 species. Dashahe macrofungi can be divided into the following three verrical zones:1.Macrofungi of lower mountain Repressentative species are : Armillaria melleaa , Auricularia auricula, Cordyceps ophioglossoides, Inocybe umbrinella, Lindcriella, Morchella esulenta, Mycena hypnorum, Pauns rudis, Pleurotus porrignes, Tremella cinnabarina etc.2.Macrofungi of mediun mountain Representative species are: Cordyceps nutans, Corticium caerulcum, Crepidotus mollis, Favolus arcularius, Laccaria amethystea, Lycoperdon pusillum, Marasmius capillaris, Mycena hypnorum, Naematoloma fascinlare, Niaulae niveo-tomentosa, Oudemansiella longipes, Panaeolus retirugis, Russula lepida, etc.3.Macrofungi of mountain top Repressntative species are : Corticium caeruleum, Favlous alveolaris, Guepinia spathularia, Inocybesp, Lycoperdon pusillum, Polystictus versicolor, P.ochrotinctellus, Xylaria ianthinavelutina, etc.

A preliminary study on structure and regeneration of rhododendron delavayi population in baili azalea forest park

Abstract: Rhododendron delavayi is an important constructive and dominant species of evergreen and broadleaf forest in Bali Azalea Forest Park. Based on field survey,the structure and distribution patterns of Rhododendron delavayi population are studied in the paper,the results show that the distribution pattern of Rhododendron delavayi populations is mainly aggregated pattern, but with ages increasing ,the intensive competition interspecies and between species makes individuals decrease and distribution pattern becomes random. Rhododendron delavayi population in various communities could be decayed or stable ones. Especially the shortage of the sexual regeneration of Rhododendron delavayi leads the population to an incomplete population. We may try to use artificial intervention methods to improve the population~(, )s smooth regeneration and stabilization in order to maintain it~(,)s sustainable development.

A stress analysis for conjunction node of shear block of steel tube, steel rib and concrete slab in composite open-web beam

Abstract: The conjunction node of shear block of steel tube, steel rib and concrete slab in the composite open-web plate is the pivotal node The theoretical analysis of these nodes is built based on the finite element method of spatial shell elements in the paper The rule of the stress distribution and the characteristics of distortion in the area of node are acquired The research shows that the stress concentration is large near the interface of each component in the area of node The reasons and resolvents of stress concentration are given in the paper