scholarly journals Effects of local biotic neighbors and habitat heterogeneity on seedling survival in a spruce-fir valley forest, northeastern China

2017 ◽  
Vol 7 (13) ◽  
pp. 4582-4591 ◽  
Author(s):  
Xucai Pu ◽  
Yu Zhu ◽  
Guangze Jin
Keyword(s):  
Habitat Heterogeneity ◽  
Seedling Survival ◽  
Northeastern China

Effects of local biotic neighbors and habitat heterogeneity on tree and shrub seedling survival in an old-growth temperate forest

Oecologia ◽  
2012 ◽  
Vol 170 (3) ◽  
pp. 755-765 ◽  
Author(s):  
Xuejiao Bai ◽  
Simon A. Queenborough ◽  
Xugao Wang ◽  
Jian Zhang ◽  
Buhang Li ◽  
...  
Keyword(s):  
Habitat Heterogeneity ◽  
Temperate Forest ◽  
Seedling Survival ◽  
Old Growth

scholarly journals Spatial patterns and associations of tree species at different developmental stages in a montane secondary temperate forest of northeastern China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11517
Author(s):  
Jia Liu ◽  
Xuejiao Bai ◽  
You Yin ◽  
Wenguang Wang ◽  
Zhiqiang Li ◽  
...  
Keyword(s):  
Spatial Patterns ◽  
Tree Species ◽  
Habitat Heterogeneity ◽  
Temperate Forest ◽  
Developmental Stages ◽  
Northeastern China ◽  
Point Pattern Analysis ◽  
Point Pattern ◽  
Secondary Forests ◽  
Neighborhood Competition

Background Secondary forests have become the major forest type worldwide. Research on spatial patterns and associations of tree species at different developmental stages may be informative in understanding the structure and dynamic processes of secondary forests. Methods In this study, we used point pattern analysis to analyze the spatial patterns and associations of tree species at seedling, sapling and adult stages in a 4ha plot in the montane secondary temperate forest of northeastern China. Results We found that species showed similar patterns at seedling, sapling and adult stages, and aggregation was the dominant pattern. The spatial patterns of tree species were mainly affected by habitat heterogeneity. In addition, the strength of positive or negative associated pattern among tree species would decrease with developmental stages, which attributed to neighborhood competition and plant size increasing. Conclusions Our results indicated that the spatial patterns and associations of tree species at seedling and sapling stages partly reflected that at adult stage; habitat heterogeneity and neighborhood competition jointly contributed to species coexistence in this secondary forest.

scholarly journals Density dependence and habitat heterogeneity regulate seedling survival in a North American temperate forest

2021 ◽  
Vol 480 ◽  
pp. 118722
Author(s):  
Lukas Magee ◽  
Amy Wolf ◽  
Robert Howe ◽  
Jonathan Schubbe ◽  
Kari Hagenow ◽  
...  
Keyword(s):  
Density Dependence ◽  
North American ◽  
Habitat Heterogeneity ◽  
Temperate Forest ◽  
Seedling Survival

Inhibition by Glaucocalyxin A of Aggregation of Rabbit Platelets Induced by ADP, Arachidonic Acid and Platelet-Activating Factor, and Inhibition of [3H]-PAF Binding

1992 ◽  
Vol 67 (04) ◽  
pp. 458-460 ◽  
Author(s):  
Zhang Bin ◽  
Long Kun
Keyword(s):  
Arachidonic Acid ◽  
Platelet Aggregation ◽  
Platelet Activating Factor ◽  
Northeastern China ◽  
Ethereal Extract ◽  
Ic50 Value ◽  
Rabbit Platelets ◽  
Ic50 Values ◽  
Induced Aggregation

SummaryGlaucocalyxin A is a new diterpenoid isolated from the ethereal extract of the leaves of Rabdosia japonica (Burm f) Hara var glaucocalyx (Maxim) Hara (Labiatae) collected in the northeastern China. When it was incubated with washed rabbit platelets, glaucocalyxin A inhibited ADP- or arachidonic acid-induced platelet aggregation with IC50 values of 4.4 μmol/1, 14.1 μmol/1 respectively. Glaucocalyxin A also inhibited PAF-induced aggregation of rabbit platelets which were refractory to ADP and arachidonic acid with an IC50 value of 13.7 μmol/1. Analysis of [3H]-PAF binding showed that glaucocalyxin A prevented [3H]-PAF binding to intact washed rabbit platelets with an IC50 value of 8.16 μmol/1, which was consistent with its inhibition of PAF-induced platelet aggregation.

Middle and Late Jurassic Radiolarians from Nadanhada Terrane of Eastern Heilongjiang Province, Northeastern China

2019 ◽  
Vol 23 (4) ◽  
pp. 291 ◽  
Author(s):  
Gang Li ◽  
Atsushi Matsuoka ◽  
Qun Yang ◽  
Jingeng Sha
Keyword(s):  
Late Jurassic ◽  
Northeastern China ◽  
Heilongjiang Province
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