scholarly journals Seasonal Dynamics of Stem Radial Increment of Pinus taiwanensis Hayata and Its Response to Environmental Factors in the Lushan Mountains, Southeastern China

Forests ◽  
2018 ◽  
Vol 9 (7) ◽  
pp. 387 ◽  
Author(s):  
Xinsheng Liu ◽  
Yuqin Nie ◽  
Feng Wen
Keyword(s):  
Environmental Factors ◽  
Seasonal Dynamics ◽  
Radial Increment ◽  
Southeastern China ◽  
Stem Radial Increment

Seasonally varying relationship between stem respiration, increment and carbon allocation of Norway spruce trees

2020 ◽  
Vol 40 (7) ◽  
pp. 943-955
Author(s):  
Eva Darenova ◽  
Petr Horáček ◽  
Jan Krejza ◽  
Radek Pokorný ◽  
Marian Pavelka
Keyword(s):  
Cell Wall ◽  
Norway Spruce ◽  
Carbon Allocation ◽  
Stem Growth ◽  
Wall Thickening ◽  
Radial Increment ◽  
Stem Respiration ◽  
Energy Demands ◽  
The Relationship ◽  
Stem Radial Increment

Abstract Stem respiration is an important component of an ecosystem’s carbon budget. Beside environmental factors, it depends highly on tree energy demands for stem growth. Determination of the relationship between stem growth and stem respiration would help to reveal the response of stem respiration to changing climate, which is expected to substantially affect tree growth. Common measurement of stem radial increment does not record all aspects of stem growth processes, especially those connected with cell wall thickening; therefore, the relationship between stem respiration and stem radial increment may vary depending on the wood cell growth differentiation phase. This study presents results from measurements of stem respiration and increment carried out for seven growing seasons in a young Norway spruce forest. Moreover, rates of carbon allocation to stems were modeled for these years. Stem respiration was divided into maintenance (Rm) and growth respiration (Rg) based upon the mature tissue method. There was a close relationship between Rg and daily stem radial increment (dSRI), and this relationship differed before and after dSRI seasonal maximum, which was around 19 June. Before this date, Rg increased exponentially with dSRI, while after this date logarithmically. This is a result of later maxima of Rg and its slower decrease when compared with dSRI, which is connected with energy demands for cell wall thickening. Rg reached a maxima at the end of June or in July. The maximum of carbon allocation to stem peaked in late summer, when Rg mostly tended to decrease. The overall contribution of Rg to stem CO2 efflux amounted to 46.9% for the growing period from May to September and 38.2% for the year as a whole. This study shows that further deeper analysis of in situ stem growth and stem respiration dynamics is greatly needed, especially with a focus on wood formation on a cell level.

Stem radial increment of forest and savanna ecotypes of a Neotropical tree: relationships with climate, phenology, and water potential

Trees ◽  
2012 ◽  
Vol 26 (4) ◽  
pp. 1137-1144 ◽  
Author(s):  
Marcos Miranda Toledo ◽  
Elder Antônio Sousa Paiva ◽  
Maria Bernadete Lovato ◽  
José Pires de Lemos Filho
Keyword(s):  
Water Potential ◽  
Radial Increment ◽  
Neotropical Tree ◽  
Stem Radial Increment

Effect of stand density on radial growth of branches of Scots pine in southern and central Finland

1999 ◽  
Vol 29 (8) ◽  
pp. 1216-1224 ◽  
Author(s):  
Harri Mäkinen
Keyword(s):  
Scots Pine ◽  
Growth Dynamics ◽  
Stand Density ◽  
Diameter Ratio ◽  
Radial Increment ◽  
Annual Rings ◽  
Independent Variables ◽  
Branch Growth ◽  
Canopy Position ◽  
Stem Radial Increment

Branch growth dynamics in Scots pine (Pinus sylvestris L.) were studied in 19 thinning experiments in southern and central Finland. Data were collected from 229 trees growing on sites of different fertility with different stand density, age, and canopy position. Radial increments were measured from discs from the base of the thickest branch on every fifth living whorl. Branch growth declined gradually from the upper part of the crown towards the crown base. Near the crown base, the effect of stand density was most apparent and branches remained alive without forming annual rings. After the thinnings, branch growth did not increase, but wider spacing delayed the reduction in branch growth and increased branch longevity. Correlation of branch increment between trees was greater in the upper whorls than in the lower crown. Correlation of the radial increment between whorls of different ages was greater between whorls near each other than between whorls from the upper and lower crown. Variation of the annual increments was similar in the stem and branches. A model was developed for predicting branch increment at different heights in the crown. The best independent variables for indicating branch increment were stem radial increment, height/diameter ratio, and branch age.

scholarly journals Seasonal Pattern of Prevalence and Excretion of Eggs of Baylisascaris transfuga in the Brown Bear (Ursus arctos)

Animals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2428
Author(s):  
Ladislav Molnár ◽  
Alžbeta Königová ◽  
Peter Major ◽  
Zuzana Vasilková ◽  
Martina Tomková ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Seasonal Dynamics ◽  
Ursus Arctos ◽  
Seasonal Pattern ◽  
Brown Bear ◽  
Seasonal Prevalence ◽  
Mean Intensity ◽  
Mean Temperature ◽  
The Mean ◽  
Baylisascaris Transfuga

The seasonal dynamics of the prevalence, abundance, and mean intensity of egg excretion by the nematode parasite Baylisascaris transfuga in the European brown bear (Ursus arctos) were monitored relative to environmental factors (mean temperature, humidity, and temperature) over three years. The prevalence, abundance, and mean intensity of egg excretion tended to increase from spring to autumn throughout the monitoring period. The seasonal prevalence (84.2–90.6%), abundance (470.2–545.3 eggs per gramme (EPG) of faeces), mean intensity of excretion (558.3–602.1 EPG), and number of eggs (1150 EPG) were highest in autumn. The prevalence of eggs (up to 48.5%), abundance (37.8–60.6 EPG), and mean intensity of excretion (94.4–125.0 EPG) were high in winter, despite the period of hibernation. The seasonal dynamics of B. transfuga abundance in bears, the mean temperature between spring and autumn, and the seasonal trend of increase in intensity of egg excretion with temperature from winter to summer were interrelated. Abundance differed significantly between winter and autumn, spring and autumn, and summer and autumn (p < 0.0001) in all years and between spring and summer in 2016 (p < 0.005), 2017 (p < 0.05). B. transfuga abundance differed significantly between the seasons over the three years only in spring (p ≤ 0.0001).

Seasonal dynamics of soil CO2 effluxes with responses to environmental factors in lower subtropical forests of China

2006 ◽  
Vol 49 (S2) ◽  
pp. 139-149 ◽  
Author(s):  
Deqiang Zhang ◽  
Xiaomin Sun ◽  
Guoyi Zhou ◽  
Junhua Yan ◽  
Yuesi Wang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Seasonal Dynamics ◽  
Soil Co2 ◽  
Subtropical Forests

Seasonal Dynamics of Phytoplankton and Environmental Factors around the Chagwi-do off the West Coast of Jeju Island, Korea

2007 ◽  
Vol 42 (2) ◽  
pp. 117-127 ◽  
Author(s):  
Abu Affan ◽  
Joon-Baek Lee ◽  
Jun -Teck Kim ◽  
Young -Chan Choi ◽  
Jong -Man Kim ◽  
...  
Keyword(s):  
Environmental Factors ◽  
West Coast ◽  
Seasonal Dynamics ◽  
Jeju Island ◽  
The West
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