Journal of Northeast Forestry University
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Phenological observations onLarix principis-rupprechtii Mayr. in primary seed orchard
Journal of Northeast Forestry University - Tập 12 Số 3 - Trang 201-204 - 2001
Seasonal dynamics of foliar δ13C and nutrient concentration of Chinese chastetree and spine jujube in foothill rock outcrop habitat of the southern Taihang Mountains, Central China
Journal of Northeast Forestry University - Tập 30 - Trang 45-56 - 2018
In this study, in situ investigation was conducted on Chinese chastetree (Vitex
negundo var. heterophylla) and spine jujube (Ziziphus jujuba var. spinosa)
during early, developed, and closing succession stages. Monthly data were
recorded for foliar δ13C values and foliar N, P, and K concentrations from May
to October. Foliar δ13C values declined with time and differences by succession
stage varied...
Effects of plant roots on soil preferential pathways and soil matrix in forest ecosystems
Journal of Northeast Forestry University - Tập 26 - Trang 397-404 - 2015
To characterize effects of plant roots on preferential flow (PF), we measured
root length density (RLD) and root biomass (RB) in Jiufeng National Forest Park,
Beijing, China. Comparisons were made for RLD and RB between soil preferential
pathways and soil matrices. RLD and RB declined with the increasing soil depth
(0–10, 10–20, 20–30, 30–40, 40–50, 50–60 cm) in all experimental plots. RLD was
gre...
Effect of sensor quantity on measurement accuracy of log inner defects by using stress wave
Journal of Northeast Forestry University - Tập 18 - Trang 221-225 - 2007
Wood nondestructive testing (NDT) is one of the high efficient methods in
utilizing wood. This paper explained the principle of log defect testing by
using stress wave, and analyzed the effects of sensor quantity on defect testing
results by using stress wave in terms of image fitting degree and error rate.
The results showed that for logs with diameter ranging from 20 to 40 cm, at
least 12 sensor...
Self-thinning lines and allometric relation in Chinese fir (Cunninghamia lanceolata) stands
Journal of Northeast Forestry University - Tập 26 - Trang 281-290 - 2015
We calculated a self-thinning exponent of 1.05 for tree mass using the 3/2 power
equation in 93 Cunninghamia lanceolata plots. According to Weller’s allometric
model, the self-thinning exponent for tree mass was calculated as 1.28 from the
allometric exponents θ and δ. The both self-thinning exponents were
significantly lower than 3/2. The self-thinning exponent of organs was estimated
to be 1.42 ...
Patterns and determinants of plant richness by elevation in a mountain ecosystem in South Korea: area, mid-domain effect, climate and productivity
Journal of Northeast Forestry University - Tập 26 - Trang 905-917 - 2015
We examined patterns of plant species richness on an elevation gradient and
evaluated the effects of climatic variables including mean annual temperature
and precipitation, area, the mid-domain effect and productivity on species
richness along two transects on Mt. Seorak, South Korea. A total of 235 plant
species of 72 families and 161 genera were recorded from 130 plots along the two
transects. T...
Dependences of longleaf pine (Pinus palustris) natural reproduction on environments above ground
Journal of Northeast Forestry University - Tập 25 - Trang 565-570 - 2014
We studied relations between natural seedling reproduction and above ground
environment in a longleaf pine ecosystem. Forty-eight 0.05 ha circular plots
were sampled under single-tree selection, grouptree selection and control stands
in three main longleaf pine areas in south Alabama, USA. We measured six
above-ground environment factors, viz. canopy closure, stand density, basal
area, average tre...
Branching and growth of plantings in fifth year of a seedling seed orchard of Masson pine (Pinus massoniana Lamb.)
Journal of Northeast Forestry University - Tập 13 - Trang 28-32 - 2002
The features of branching and growth studied included height, diameter at breast
height (DBH), total number of branches, annual height growth, annual branch
elongation in the year of elongating, annual branch number for four consecutive
years, diameter of branches of different ages, and diameter of stem where
branch-whorl originates. For features of total growth and overall branching, no
significa...
Regeneration of pitch pine (Pinus rigida) stands inhibited by fire suppression in Albany Pine Bush Preserve, New York
Journal of Northeast Forestry University - Tập 30 - Trang 233-242 - 2018
The Pine Barrens in New York State are dominated by pitch pine (Pinus ridgida)
and scrub oaks (Quercus ilicifolia and Q. prinoides). With fire suppression over
the last 90 years or so, P. rigida regeneration has become sparse, even in areas
set aside to preserve this type of vegetation. We evaluated the effects of fire
and an alternative disturbance (mechanical removal of vegetation) for increasin...
A preliminary study on forest edge effect and application
Journal of Northeast Forestry University - - 1991
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