DIVERSITY of MEDICINAL PLANTS IN MUONG TE DISTRICT, LAI CHAU PROVINE
Hoang Thanh Son, Nguyen Hoang Nghia, Pham Quang Tuyen, Trinh Ngoc Bon
Forest
Sciene Institute of Vietnam
Summary
Total number of medicinal plant species
found during the surveys conducted in Muong Te district, Lai Chau province is
213 species of 169 genera and 83 families. Among these species, there are 206
species (96,71%) of Magnoliophyta, 6 species (2,82%) of Polypodiophyta and 1
species (0.47%) of Lycopodiophyta. The 8 richest families include 78 species
(36.62% of total species in the surveyed area) and 51 genera (30.2% of total
genera). They are Euphorbiaceae (24 species), Verbenaceae (13), Asteraceae
(11), Moraceae (8), Fabaceae (6), Araceae (6), Rubiaceae (5), and Araliaceae
(5). Medicinal plants in Muong Te are found in main four life-forms; herb
plants have 58 species (27.23%), wooden plants have 57 species (26.76%), shrubs
have 56 species (26.29%) and climbing plants have 42 species (19.72%). The
whole plant or parts of plants of these species have been used as medicine such
as the whole plant: 71 species (40.85%), leaves: 33.33%, roots: 25.82%, bark:
10.33%, and fruits: 8.92%. Plants have also been used to treat different kinds
of diseases. There are 36 species (16.9%) related to treatment of digestion
system; 23 species (10.8%) to treatment of women problems; 21 species to
treatment of bones. There are 5 species found in the area to be listed in Red
Book of Vietnam, 2007.
Keywords: Medicinal plant
diversity, Muong Te, Lai Chau
ALLOMETRIC EQUATIONS FOR BIOMASS ESTIMATION
OF INDIVIDUAL TREE OF PINUS KESIYA IN HOANG SU PHI DISTRIC, HA GIANG PROVINCE
Vu Tan Phuong
Forest
Sciene Institute of Vietnam
SUMMARY
To support the implementation of forest
carbon stock of Pinus kesyia plantation,
the study on development of allometric equations, BEF and root shoot ratio for
biomass estimation was carried out as the base for quantifying carbon stock of
the plantations. The study site is Hoang Su Phi district, Ha Giang province.
Destructive method was used to measure fresh biomass and drying method was
employed for dried mass analysis. The sample trees were selected representing
for site condition, growth and age of the stand. The analysis was made based on
26 sample trees with age from 5 to 26 years old. The results show that biomass
of different organs of trees (stem, branch, leave, root, total biomass, above
ground biomass) has a close correlation with DBH (0,9 ≤ r < 1). The BEF
value is 0,737±0,155 and the R/S value is 0,177 ± 0,025.
Keyword: carbon, biomass, Pinus keysia,
Hoang Su Phi
Assesment the growth of Acacia
SPECIES AT the demonstration model of the forest development project in Thua
Thien Hue
province
Hoang Vang Thang, Nguyen Toan Thang, Phan Minh Quang
Forest Sciene Institute of Vietnam
SUMMARY
Two years after planted, all Acacia mangium and Acacia hybrids (A. mangium x
A.auriculiformis, from cutting propagation and tissue culture) at the
silviculture demonstration models in Phong Dien, Huong Tra and Phu Loc
districts, Thua Thien Hue province reach up to 95 percentage of the survival
rate. In general, their growth is relatively good as after two years, the
average growth of Acacia hybrids from tissue culture is 6,6cm in diameter and
7,3m in height, while average growth of Acacia hybrids from cutting propagation
is 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
years applied pruning, the impact of the practise is not significant, as only
25% individuals have different growht with the control model (no pruning) on
diameter and height, but 75% are not diffrent .
Keyword: Acacia, growth, demonstration models, Thua Thien Hue
province.
BIOMASS STRUCTURE OF PINUS KESIYA PLANTATION IN LAM
DONG PROVINCE
Vu Tan Phuong, Vo Dai Hai
Forest Sciene Institute of Vietnam
SUMMARY
In
recent years, the role of forest in carbon sequestration and mitigation of
green house gases emission has been receiving special interests of
international communities and Vietnam.
Studies on biomass and carbon sequestration are becoming urgent tasks for green
house gases inventory and carbon trading. This study was carried out in Lam
Dong province where Pinus kesiya plantation areas are widely distributed. The
study focuses on biomass and biomass structure in Pinus kesiya stands that include biomass of forest trees, biomass
of ground vegetation and litter layer by plantation ages and site quality
conditions. The study results show that total biomass of plantation on site
class I is about 348 tons/ha; on site class II is 258 tons/ha; on site class
III is 171 tons/ha; on class IV is 120 tons/ha; and on site class V is tons/ha.
Biomass structure of forest trees of the stands is estimated of 86% (range from
82 – 94%) of total stand biomass; biomass of ground vegetation is 3,9 % (from
1,3 – 7,7%) of total stand biomass; and biomass of litter layer is 10,5% (from
4,6 – 16,6%) of total stand biomass.
Keyword:
Biomass, Pinus kesiya, Lam Dong.
SILVICULTURAL
CHARACTERISTICS OF POPULATION AND REGENERATION ABILITY OF Cinnamomum
obtusifolium IN XUAN SON NATIONAL PARK, PHU THO PROVINCE
Nguyen
Van Tien
Forests
Protection Department
Nguyen
Huy Son
Forestry
Science Institute of Vietnam
SUMMARY
Cinnamomum obtusifolium is a big and evergreen broadleaved tree species.
There are 21-25 tree species occupied the dominant storey in IIb forest in Xuan Son National Park,
Phu Tho Province, of which
4 to 6 species are the most dominant, icluding: C. obtusifolium, Castanopsis phuthoensis,
Cinnadenia paniculata,
Syzygium wightianum, Pometia
pinnata, Engelhardtia
chrysolepis… with the IV index varies from 8.48-21.97%.
The density of the forest is from
340-390 trees/ha. Among these species, C. obtusifolium contributes about 60-75
trees/ha. The regenerated seedling composition of the
forest consists of from 21-22 species and the density is about 14,080-15,360 individuals/ha. In
particular, the seedling density of C. obtusifolium is from 1,040 – 2,640 individuals/ha,
the certain number of potential regeneration trees reaches 640-880 individuals/ha.
C. obtusifolium is one of the four species with the IV(%)
highest index, including: C. obtusifolium,
Castanopsis phuthoensis, Cinnadenia paniculata, Syzygium wightianum. The
number of regenerated seedling of C. obtusifolium is highest at the canopy cover of 0.25-0.30,
following by the canopy cover from 0.40- 0.45, and the lowest under the canopy
cover ≥ 0.65. The number of potential regenerated seedlings decreases steadily
from low canopy cover to high ones (0.25-0.30; 0.40-0.45 and ≥ 0.65).
Keywords:
Cinnamomum obtusifolium, natural regeneration, species composition.
PARAMETERS ESTIMATING METHODS OF CHUMACHER
GROWTH FUNCTION
Nguyen Van Them
Nong Lam
University
SUMMARY
This paper
introduces the differences from the analysis results and predicts the growing
process of individual tree using Schumacher function by the influence of three
parameters estimating methods of Schumacher function and the selection of stop
criteria or evaluating suitable level criteria of the model. To do this, the
author related the tree-trunk volume data of Pinus keysia Royle ex Gordon 60 years old with Schumacher function, in which the parameters was
estimated by two methods: linear regression and non-linear regression. In each
method, the most estimating suitable function of model was selected based on 5
criteria as follows: (1) Maximum determinant coefficient (R-squared), (2)
Minimum standard error of the estimate (SEmin), (3) Minimum mean
absolute error (MAEmin), (4) Minimum mean absolute percent error
(MAPEmin), (5) Residual sum of squares (SSRmin). The
research results show that: (1) If using residual sum of squares (SSRmin)
method to estimate the parameters of Schumacher function, the fixed parameter m
give more precise results than the fixed parameter c. (2) The parameters of
Schumacher function estimated by non-linear correlation regression are attained
higher degree of confident than Residual Sum of Squares (SSRmin)
method. (3) If selecting parameters estimating of Schumacher function method
and different stop criteria, the most estimating suitable function is also
distinct.
Keywords: Method of minimum standard error, method of trial and
error, parameter estimation, Schumacher function, stop criteria.
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