Journal of Northeast Forestry University
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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......
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......
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......
A new species of Paraphaenodiscus Girault (Hymenoptera: Encyrtidae) from China
Journal of Northeast Forestry University - Tập 30 - Trang 1115-1118 - 2018
Paraphaenodiscus tricolor sp. nov. is described as new to science from China. A short key to described species from China based on females is given.
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......
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