Fire-frequency effects on vegetation in north Florida pinelands: Another look at the long-term Stoddard Fire Research Plots at Tall Timbers Research Station

2012 ◽  
Vol 264 ◽  
pp. 197-209 ◽  
Author(s):  
Jeff S. Glitzenstein ◽  
Donna R. Streng ◽  
Ronald E. Masters ◽  
Kevin M. Robertson ◽  
Sharon M. Hermann
Keyword(s):  
Fire Frequency ◽  
Fire Research ◽  
Research Station ◽  
Frequency Effects

Long-term observation of underwater ambient noise at the Ieodo Ocean Research Station in Korea

2015 ◽  
Author(s):  
Byoung-Nam Kim ◽  
Seom-Kyu Jung ◽  
Bok Kyung Choi ◽  
Bong-Chae Km ◽  
JaeSeol Shim
Keyword(s):  
Ambient Noise ◽  
Research Station ◽  
Long Term Observation

scholarly journals Monitoring growth of Uttis (Alnus nepalensis) at a plantation cite at Dhankuta, Nepal

1970 ◽  
Vol 15 (2) ◽  
pp. 19-23
Author(s):  
T. P. Barakoti
Keyword(s):  
Agricultural Research ◽  
Growth Monitoring ◽  
Research Station ◽  
Growth Modelling ◽  
Annual Increment ◽  
Permanent Sample Plots ◽  
Alnus Nepalensis ◽  
Breast Height ◽  
Growing Environment

A long-term growth monitoring experiment on Uttis (Alnus nepalensis) was conducted in the permanent sample plots of the Agricultural Research Station (ARS) Pakhribas, Dhankuta for 10 years (1992-2001). The average annual increment was diameter at breast height 2.14 cm in 8th year, and was 0.13 cm at 16th year of planting. The trees grew 44 cm to 130 cm per year irrespective of the age. The highest growth rate correspondend with higher rainfall during summer (March-April). Estimated biomass of stem and branches increased by 2-2.5 times within the 10 years period. Thinning and felling every year indicated need for timely management of the plantation to provide better growing environment. The data would be useful for growth modelling and proper management of Uttis plantation in Nepal . Key words: Nepalese alder vs Uttis, height, diameter, biomass, Pakhribas. Banko Janakari Vol.15(2) 2005 pp19-23

scholarly journals Field Research and Conservation

2013 ◽  
Vol 36 ◽  
pp. 179-180
Author(s):  
Chuck Collis ◽  
Jennifer Adams
Keyword(s):  
Behavioral Ecology ◽  
National Park ◽  
Biological Process ◽  
Field Research ◽  
Research Station ◽  
Surrounding Area ◽  
Research Experiences ◽  
Political Processes ◽  
Term Field

The Field Research & Conservation class emphasizes long-term field research experiences, examines ecosystem processes, and investigates the evolution of American perspectives about nature. Our time spent at the UW-NPS research station was divided between pursuing behavioral ecology research and exploring Grand Teton National Park and the surrounding area to gain understanding of how the region was shaped, both by geological and biological process as well as political processes that have been shaped by America’s ever-changing conservation ethic.

scholarly journals A single gas chromatograph for accurate atmospheric mixing ratio measurements of CO<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub>O, SF<sub>6</sub> and CO

2009 ◽  
Vol 2 (2) ◽  
pp. 549-559 ◽  
Author(s):  
S. van der Laan ◽  
R. E. M. Neubert ◽  
H. A. J. Meijer
Keyword(s):  
Research Station ◽  
Time Lags ◽  
Gas Chromatograph ◽  
Efficient System ◽  
Term Stability ◽  
Mixing Ratios ◽  
Long Term Stability ◽  
High Measurement ◽  
Cost Efficient

Abstract. We present an adapted gas chromatograph capable of measuring simultaneously and semi-continuously the atmospheric mixing ratios of the greenhouse gases CO2, CH4, N2O and SF6 and the trace gas CO with high precision and long-term stability. The novelty of our design is that all species are measured with only one device, making it a very cost-efficient system. No time lags are introduced between the measured mixing ratios. The system is designed to operate fully autonomously which makes it ideal for measurements at remote and unmanned stations. Only a small amount of sample air is needed, which makes this system also highly suitable for flask air measurements. In principle, only two reference cylinders are needed for daily operation and only one calibration per year against international WMO standards is sufficient to obtain high measurement precision and accuracy. The system described in this paper is in use since May 2006 at our atmospheric measurement site Lutjewad near Groningen, The Netherlands at 6°21´ E, 53°24´N, 1 m a.s.l. Results show the long-term stability of the system. Observed measurement precisions at our remote research station Lutjewad were: ±0.04 ppm for CO2, ±0.8 ppb for CH4, ±0.8 ppb for CO, ±0.3 ppb for N2O, and ±0.1 ppt for SF6. The ambient mixing ratios of all measured species as observed at station Lutjewad for the period of May 2007 to August 2008 are presented as well.

Long‐term fauna and flora records of the experimental forests of the Forest Research Station of Hokkaido University, Japan

2019 ◽  
Vol 34 (3) ◽  
pp. 349-349
Author(s):  
Chisato Terada ◽  
TaeOh Kwon ◽  
Nobuko Kazahari ◽  
Osamu Kishida ◽  
Shunsuke Utsumi
Keyword(s):  
Research Station ◽  
Forest Research

scholarly journals Resilience of the boreal forest in response to Holocene fire-frequency changes assessed by pollen diversity and population dynamics

2010 ◽  
Vol 19 (8) ◽  
pp. 1026 ◽  
Author(s):  
Christopher Carcaillet ◽  
Pierre J. H. Richard ◽  
Yves Bergeron ◽  
Bianca Fréchette ◽  
Adam A. Ali
Keyword(s):  
Boreal Forest ◽  
Boreal Forests ◽  
Frequency Control ◽  
Regional Scale ◽  
Fire Regimes ◽  
Fire Frequency ◽  
Frequency Changes ◽  
Fire Intervals ◽  
In Fire

The hypothesis that changes in fire frequency control the long-term dynamics of boreal forests is tested on the basis of paleodata. Sites with different wildfire histories at the regional scale should exhibit different vegetation trajectories. Mean fire intervals and vegetation reconstructions are based respectively on sedimentary charcoal and pollen from two small lakes, one in the Mixedwood boreal forests and the second in the Coniferous boreal forests. The pollen-inferred vegetation exhibits different trajectories of boreal forest dynamics after afforestation, whereas mean fire intervals have no significant or a delayed impact on the pollen data, either in terms of diversity or trajectories. These boreal forests appear resilient to changes in fire regimes, although subtle modifications can be highlighted. Vegetation compositions have converged during the last 1200 years with the decrease in mean fire intervals, owing to an increasing abundance of boreal species at the southern site (Mixedwood), whereas changes are less pronounced at the northern site (Coniferous). Although wildfire is a natural property of boreal ecosystems, this study does not support the hypothesis that changes in mean fire intervals are the key process controlling long-term vegetation transformation. Fluctuations in mean fire intervals alone do not explain the historical and current distribution of vegetation, but they may have accelerated the climatic process of borealisation, likely resulting from orbital forcing.

scholarly journals The response of cerambycid beetles (Coleoptera: Cerambycidae) to long-term fire frequency regimes in subtropical eucalypt forest

2019 ◽  
Vol 44 (4) ◽  
pp. 609-620 ◽  
Author(s):  
Martyn Eliott ◽  
Simon Lawson ◽  
Andrew Hayes ◽  
Valerie Debuse ◽  
Alan York ◽  
...  
Keyword(s):  
Fire Frequency ◽  
Eucalypt Forest ◽  
Cerambycid Beetles

scholarly journals Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica – Part 1: long-term trends

2020 ◽  
Vol 20 (11) ◽  
pp. 6379-6394 ◽  
Author(s):  
W. John R. French ◽  
Frank J. Mulligan ◽  
Andrew R. Klekociuk
Keyword(s):  
Solar Cycle ◽  
Rotational Temperature ◽  
Winter Season ◽  
Pressure Level ◽  
Recent Analysis ◽  
Research Station ◽  
Mesopause Region ◽  
Term Trend ◽  
Long Term Trend

Abstract. The long-term trend, solar cycle response, and residual variability in 24 years of hydroxyl nightglow rotational temperatures above Davis research station, Antarctica (68∘ S, 78∘ E) are reported. Hydroxyl rotational temperatures are a layer-weighted proxy for kinetic temperatures near 87 km altitude and have been used for many decades to monitor trends in the mesopause region in response to increasing greenhouse gas emissions. Routine observations of the OH(6-2) band P-branch emission lines using a scanning spectrometer at Davis station have been made continuously over each winter season since 1995. Significant outcomes of this most recent analysis update are the following: (a) a record-low winter-average temperature of 198.3 K is obtained for 2018 (1.7 K below previous low in 2009); (b) a long-term cooling trend of -1.2±0.51 K per decade persists, coupled with a solar cycle response of 4.3±1.02 K per 100 solar flux units; and (c) we find evidence in the residual winter mean temperatures of an oscillation on a quasi-quadrennial (QQO) timescale which is investigated in detail in Part 2 of this work. Our observations and trend analyses are compared with satellite measurements from Aura/MLS version v4.2 level-2 data over the last 14 years, and we find close agreement (a best fit to temperature anomalies) with the 0.00464 hPa pressure level values. The solar cycle response (3.4±2.3 K per 100 sfu), long-term trend (-1.3±1.2 K per decade), and underlying QQO residuals in Aura/MLS are consistent with the Davis observations. Consequently, we extend the Aura/MLS trend analysis to provide a global view of solar response and long-term trend for Southern and Northern Hemisphere winter seasons at the 0.00464 hPa pressure level to compare with other observers and models.

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