Journal of Northeast Forestry University
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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......
Estimation of premature forests in Georgia (USA) using U.S. Forest Service FIA data and Landsat imagery
Journal of Northeast Forestry University - Tập 28 - Trang 1249-1260 - 2017
We used geographic information system applications and statistical analyses to classify young, premature forest areas in southeastern Georgia using combined data from Landsat TM 5 satellite imagery and ground inventory data. We defined premature stands as forests with trees up to 15 years old. We estimated the premature forest areas using three methods: maximum likelihood classification (MLC), reg......
Study on relationships among seedling quality and survival rate, stocking percentage and growth
Journal of Northeast Forestry University - Tập 5 - Trang 37-45 - 1994
Effects of various seedling classes and root cutting treatments on the survival rate, stocking percentage and the growth of height and collar diameter in young stands of korean pine (Pinus koraiensis), mongolian scots pine (Pinus sylvestris var.mangolica),Dahurian larch (Larix gmelini), korean spruce (Picea koraiensis), anur cork tree(Phellodendron amurensis), manchurian ash (Fradinus mandshurica)......
Microenvironmental effects on growth response of Pinus massoniana to climate at its northern boundary in the Tongbai Mountains, Central China
Journal of Northeast Forestry University - Tập 35 - Trang 1-14 - 2023
The Tongbai Mountains is an ecologically sensitive region and the northern boundary of Pinus massoniana Lamb. To analyze the effect of different microenvironments on tree growth response to climate factors, we developed standard chronologies for earlywood width (EWW), latewood width (LWW), and total ring width (TRW) of P. massoniana at two sampling sites on slopes with different orientations, then......
Landscape pattern and fragmentation of natural secondary forests in the eastern mountainous region, northeast China: A case study of Mao'ershan forests in Heilongjiang Province
Journal of Northeast Forestry University - Tập 16 - Trang 35-38 - 2005
Mao'ershan region is a representative natural secondary forested region in the eastern mountainous region, northeast of China. Under the support of ARC/INFO and GIS technology, the landscape shape and fragment indices of Mao'ershan experimental plantation were studied by combining the forest type map (1∶10000), which was drawn from the aerial photographs (1999), field investigation (1999) and soil......
Identification of four larch species seeds with peroxidase isoenzymes
Journal of Northeast Forestry University - Tập 3 - Trang 41-46 - 1992
The POD isozymograms of shelled seeds and embryos could be used to distinguish seeds of four species ofLarix. The period of sampling isozymes was critical and the two periods B and C in radical lengths of germinating seeds were shown to be optimal for sampling. Based on the number of common zones, the degree of similarity of isozymograms and double axises system ordinations, the relationship of fo......
The preliminary study on juvenile-mature correlation ofPinus koraiensis
Journal of Northeast Forestry University - - 1997
Structure and floristic composition of old-growth wet evergreen forests of Nelliampathy Hills, Southern Western Ghats
Journal of Northeast Forestry University - Tập 24 - Trang 37-46 - 2013
We analyze the structure and composition of old-growth wet evergreen forest of Nelliampathy hills, the chain of hills lying immediately south of Palghat Gap, in the southern Western Ghats of India. We sampled 30 plots of 0.1 ha each (50 m × 20 m) at six locations enumerating all plants ⩾ 10 cm girth at breast height. We pooled the data and computed various structural parameters. There were 152 spe......
Species frequency of communities along northern slope of Changbai Mountain, Northeast China
Journal of Northeast Forestry University - Tập 11 - Trang 187-190 - 2000
The species distribution frequency of communities from 700 m to 1900 m along northern slope of Changbai Mountain was studied by using Raunkiaer's frequency analysis methods in summer of 1999. The variation on composition and structure of communities with the increase of elevation was displayed from the point of view of frequency. The results showed that for all the species of community including t......
Response of Pinus koraiensis seedling growth to different light conditions based on the assessment of photosynthesis in current and one-year-old needles
Journal of Northeast Forestry University - Tập 25 - Trang 53-62 - 2014
As one of the three major five-leaved pines in the northern hemisphere, Pinus koraiensis is the most important dominant tree species in the natural mixed-broadleaved Korean pine forests. However, the regeneration of P. koraiensis under the canopy of secondary forest stands is poor because of the light limitation. This study was conducted to understand how P. koraiensis seedlings adapt to different......
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