Summary<\/strong><\/p>\nTotal number of medicinal plant species
\nfound during the surveys conducted in Muong Te district, Lai Chau province is
\n213 species of 169 genera and 83 families. Among these species, there are 206
\nspecies (96,71%) of Magnoliophyta, 6 species (2,82%) of Polypodiophyta and 1
\nspecies (0.47%) of Lycopodiophyta. The 8 richest families include 78 species
\n(36.62% of total species in the surveyed area) and 51 genera (30.2% of total
\ngenera). They are Euphorbiaceae (24 species), Verbenaceae (13), Asteraceae
\n(11), Moraceae (8), Fabaceae (6), Araceae (6), Rubiaceae (5), and Araliaceae
\n(5). Medicinal plants in Muong Te are found in main four life-forms; herb
\nplants have 58 species (27.23%), wooden plants have 57 species (26.76%), shrubs
\nhave 56 species (26.29%) and climbing plants have 42 species (19.72%). The
\nwhole plant or parts of plants of these species have been used as medicine such
\nas the whole plant: 71 species (40.85%), leaves: 33.33%, roots: 25.82%, bark:
\n10.33%, and fruits: 8.92%. Plants have also been used to treat different kinds
\nof diseases. There are 36 species (16.9%) related to treatment of digestion
\nsystem; 23 species (10.8%) to treatment of women problems; 21 species to
\ntreatment of bones. There are 5 species found in the area to be listed in Red
\nBook of Vietnam, 2007.<\/p>\n
Keywords:<\/strong> Medicinal plant
\ndiversity, Muong Te, Lai Chau<\/p>\n <\/p>\n
ALLOMETRIC EQUATIONS FOR BIOMASS ESTIMATION
\nOF INDIVIDUAL TREE OF PINUS KESIYA IN HOANG SU PHI DISTRIC, HA GIANG PROVINCE<\/strong><\/p>\nVu Tan Phuong<\/strong><\/p>\nForest
\nSciene Institute of Vietnam<\/em><\/p>\nSUMMARY<\/strong><\/p>\nTo support the implementation of forest
\ncarbon stock of Pinus kesyia plantation,
\nthe study on development of allometric equations, BEF and root shoot ratio for
\nbiomass estimation was carried out as the base for quantifying carbon stock of
\nthe plantations. The study site is Hoang Su Phi district, Ha Giang province.
\nDestructive method was used to measure fresh biomass and drying method was
\nemployed for dried mass analysis. The sample trees were selected representing
\nfor site condition, growth and age of the stand. The analysis was made based on
\n26 sample trees with age from 5 to 26 years old. The results show that biomass
\nof different organs of trees (stem, branch, leave, root, total biomass, above
\nground biomass) has a close correlation with DBH (0,9 \u2264 r < 1). The BEF
\nvalue is 0,737\u00b10,155 and the R\/S value is 0,177 \u00b1 0,025.<\/p>\n
Keyword:<\/strong> carbon, biomass, Pinus keysia,
\nHoang Su Phi<\/p>\n <\/p>\n
Assesment the growth of Acacia
\nSPECIES AT the demonstration model of the forest development project in Thua
\nThien Hue
\nprovince<\/strong><\/p>\nHoang Vang Thang, Nguyen Toan Thang, Phan Minh Quang<\/strong><\/p>\nForest Sciene Institute of Vietnam<\/em><\/p>\nSUMMARY<\/strong><\/p>\nTwo years after planted, all Acacia mangium and Acacia hybrids (A. mangium x
\nA.auriculiformis, from cutting propagation and tissue culture) at the
\nsilviculture demonstration models in Phong Dien, Huong Tra and Phu Loc
\ndistricts, Thua Thien Hue province reach up to 95 percentage of the survival
\nrate. In general, their growth is relatively good as after two years, the
\naverage growth of Acacia hybrids from tissue culture is 6,6cm in diameter and
\n7,3m in height, while average growth of Acacia hybrids from cutting propagation
\nis 6,1cm in diameter, 6,6m in height and average growth of Acacia mangium is 6,0cm in diameter, 5,8m in height. After two
\nyears applied pruning, the impact of the practise is not significant, as only
\n25% individuals have different growht with the control model (no pruning) on
\ndiameter and height, but 75% are not diffrent .<\/p>\n
Keyword:<\/strong> Acacia, growth, demonstration models, Thua Thien Hue
\nprovince.<\/p>\n <\/p>\n
BIOMASS STRUCTURE OF PINUS KESIYA PLANTATION IN LAM
\nDONG PROVINCE<\/strong><\/p>\n\u00a0<\/strong><\/p>\nVu Tan Phuong, Vo Dai Hai<\/strong><\/p>\nForest Sciene Institute of Vietnam<\/em><\/p>\nSUMMARY<\/strong><\/p>\nIn
\nrecent years, the role of forest in carbon sequestration and mitigation of
\ngreen house gases emission has been receiving special interests of
\ninternational communities and Vietnam.
\nStudies on biomass and carbon sequestration are becoming urgent tasks for green
\nhouse gases inventory and carbon trading. This study was carried out in Lam
\nDong province where Pinus kesiya plantation areas are widely distributed. The
\nstudy focuses on biomass and biomass structure in Pinus kesiya stands that include biomass of forest trees, biomass
\nof ground vegetation and litter layer by plantation ages and site quality
\nconditions. The study results show that total biomass of plantation on site
\nclass I is about 348 tons\/ha; on site class II is 258 tons\/ha; on site class
\nIII is 171 tons\/ha; on class IV is 120 tons\/ha; and on site class V is tons\/ha.
\nBiomass structure of forest trees of the stands is estimated of 86% (range from
\n82 \u2013 94%) of total stand biomass; biomass of ground vegetation is 3,9 % (from
\n1,3 \u2013 7,7%) of total stand biomass; and biomass of litter layer is 10,5% (from
\n4,6 \u2013 16,6%) of total stand biomass.<\/p>\n
Keyword:<\/strong>
\nBiomass, Pinus kesiya, Lam Dong.<\/p>\n <\/p>\n
SILVICULTURAL
\nCHARACTERISTICS OF POPULATION AND REGENERATION ABILITY\u00a0 OF Cinnamomum
\nobtusifolium IN XUAN SON NATIONAL PARK, PHU THO PROVINCE<\/strong><\/p>\n\u00a0<\/strong><\/p>\nNguyen
\nVan Tien<\/strong><\/p>\nForests
\nProtection Department<\/em><\/p>\nNguyen
\nHuy Son<\/strong><\/p>\nForestry
\nScience Institute of Vietnam\u00a0\u00a0\u00a0<\/em><\/p>\nSUMMARY<\/strong><\/p>\nCinnamomum obtusifolium is a big and evergreen broadleaved tree species.
\nThere are 21-25 tree species occupied the dominant storey in IIb forest in Xuan Son National Park,
\nPhu Tho Province, of which
\n4 to 6 species are the most dominant, icluding: C. obtusifolium, Castanopsis phuthoensis,
\nCinnadenia paniculata,
\nSyzygium wightianum, Pometia
\npinnata, Engelhardtia
\nchrysolepis… with the IV index varies from 8.48-21.97%.
\nThe density of the forest is from
\n340-390 trees\/ha. Among these species, C. obtusifolium contributes about 60-75
\ntrees\/ha. The regenerated seedling composition of the
\nforest consists of from 21-22 species and the density is about 14,080-15,360 individuals\/ha. In
\nparticular, the seedling density of C. obtusifolium is from 1,040 – 2,640 individuals\/ha,
\nthe certain number of potential regeneration trees reaches 640-880 individuals\/ha.
\nC. obtusifolium is one of the four species with the IV(%)
\nhighest index, including: C. obtusifolium,
\nCastanopsis phuthoensis, Cinnadenia paniculata, Syzygium wightianum. The
\nnumber of regenerated seedling of C. obtusifolium is highest at the canopy cover of 0.25-0.30,
\nfollowing by the canopy cover from 0.40- 0.45, and the lowest under the canopy
\ncover \u2265 0.65. The number of potential regenerated seedlings decreases steadily
\nfrom low canopy cover to high ones (0.25-0.30; 0.40-0.45 and \u2265 0.65).<\/p>\n
Keywords:
\n<\/strong>Cinnamomum obtusifolium,\u00a0 natural regeneration, species composition.<\/p>\n <\/p>\n
PARAMETERS ESTIMATING METHODS OF CHUMACHER
\nGROWTH FUNCTION<\/strong><\/p>\n\u00a0<\/strong><\/p>\nNguyen Van Them<\/strong><\/p>\nNong Lam
\nUniversity<\/em><\/p>\nSUMMARY<\/p>\n
This paper
\nintroduces the differences from the analysis results and predicts the growing
\nprocess of individual tree using Schumacher function by the influence of three
\nparameters estimating methods of Schumacher function and the selection of stop
\ncriteria or evaluating suitable level criteria of the model. To do this, the
\nauthor related the tree-trunk volume data of Pinus keysia Royle ex Gordon 60 years old with \u00a0Schumacher function, in which the parameters was
\nestimated by two methods: linear regression and non-linear regression. In each
\nmethod, the most estimating suitable function of model was selected based on 5
\ncriteria as follows: (1) Maximum determinant coefficient (R-squared), (2)
\nMinimum standard error of the estimate (SEmin), (3) Minimum mean
\nabsolute error (MAEmin), (4) Minimum mean absolute percent error
\n(MAPEmin), (5) Residual sum of squares (SSRmin). The
\nresearch results show that: (1) If using residual sum of squares (SSRmin)
\nmethod to estimate the parameters of Schumacher function, the fixed parameter m
\ngive more precise results than the fixed parameter c. (2) The parameters of
\nSchumacher function estimated by non-linear correlation regression are attained
\nhigher degree of confident than Residual Sum of Squares (SSRmin)
\nmethod. (3) If selecting parameters estimating of Schumacher function method
\nand different stop criteria, the most estimating suitable function is also
\ndistinct.<\/p>\n
Keywords:<\/strong> Method of minimum standard error, method of trial and
\nerror, parameter estimation, Schumacher function, stop criteria.<\/p>\n","protected":false},"excerpt":{"rendered":"<\/p>\n
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Total number of medicinal plant species found
\nduring the surveys conducted in Muong Te district, Lai Chau province is 213
\nspecies of 169 genera and 83 families. Among these species, there are 206
\nspecies (96,71%) of Magnoliophyta, 6 species (2,82%) of Polypodiophyta and 1
\nspecies (0.47%) of Lycopodiophyta.<\/span><\/p>\n<\/p>\n
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