scholarly journals Nitrous oxide and methane fluxes from perturbed and unperturbed boreal forest sites in northern Ontario

1996 ◽  
Vol 101 (D17) ◽  
pp. 22767-22774 ◽  
Author(s):  
C. L. Schiller ◽  
D. R. Hastie
Keyword(s):  
Nitrous Oxide ◽  
Boreal Forest ◽  
Northern Ontario ◽  
Forest Sites ◽  
Methane Fluxes

scholarly journals Nitrous oxide and methane fluxes from cattle excrement on C3 pasture and C4-dominated shortgrass steppe

2016 ◽  
Vol 225 ◽  
pp. 104-115 ◽  
Author(s):  
Kristopher L. Nichols ◽  
Stephen J. Del Grosso ◽  
Justin D. Derner ◽  
Ronald F. Follett ◽  
Shawn L. Archibeque ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Shortgrass Steppe ◽  
Methane Fluxes

Nitrous Oxide and Methane Fluxes from Urine and Dung Deposited on Kenyan Pastures

2017 ◽  
Vol 46 (4) ◽  
pp. 921-929 ◽  
Author(s):  
Katherine L. Tully ◽  
Sheila Abwanda ◽  
Margaret Thiong'o ◽  
Paul M. Mutuo ◽  
Todd S. Rosenstock
Keyword(s):  
Nitrous Oxide ◽  
Methane Fluxes

Classification of annual non-stand replacing boreal forest change in Canada using Landsat time series: a case study in northern Ontario

2016 ◽  
Vol 8 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Oumer S. Ahmed ◽  
Michael A. Wulder ◽  
Joanne C. White ◽  
Txomin Hermosilla ◽  
Nicholas C. Coops ◽  
...  
Keyword(s):  
Time Series ◽  
Boreal Forest ◽  
Forest Change ◽  
Northern Ontario

scholarly journals Constraining ecosystem model with Adaptive Metropolis algorithm using boreal forest site eddy covariance measurements

2016 ◽  
Author(s):  
Jarmo Mäkelä ◽  
Jouni Susiluoto ◽  
Tiina Markkanen ◽  
Mika Aurela ◽  
Ivan Mammarella ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Gross Primary Production ◽  
Co2 Concentration ◽  
Moisture Stress ◽  
Ecosystem Model ◽  
Metropolis Algorithm ◽  
Forest Site ◽  
Diurnal Cycles ◽  
Forest Sites ◽  
Eddy Covariance Measurements

Abstract. We examined parameter optimization in JSBACH ecosystem model, applied for two boreal forest sites in Finland. We identified and tested key parameters in soil hydrology and forest water and carbon exchange related formulations and optimized them using the Adaptive Metropolis algorithm for a five year calibration period (2000–2004) followed by a four year validation period (2005–2008). We were able to improve the modelled seasonal, daily and diurnal cycles of gross primary production and evapotranspiration but unable to enhance the models response to dryness. The improvements are mostly accounted for by parameters related to the ratio of leaf internal CO2 concentration to external CO2, relative humidity, transpiration and soil moisture stress.

Summary and Synthesis: Past and Future Changes in the Alaskan Boreal Forest

2006 ◽  
Author(s):  
Marilyn W. Walker ◽  
Mary E. Edwards
Keyword(s):  
Boreal Forest ◽  
Bark Beetles ◽  
Fire Regime ◽  
Black Spruce ◽  
Rapid Change ◽  
White Spruce ◽  
Late Glacial ◽  
Fire Frequency ◽  
Tree Resistance ◽  
Forest Sites

Historically the boreal forest has experienced major changes, and it remains a highly dynamic biome today. During cold phases of Quaternary climate cycles, forests were virtually absent from Alaska, and since the postglacial re-establishment of forests ca 13,000 years ago, there have been periods of both relative stability and rapid change (Chapter 5). Today, the Alaskan boreal forest appears to be on the brink of further significant change in composition and function triggered by recent changes that include climatic warming (Chapter 4). In this chapter, we summarize the major conclusions from earlier chapters as a basis for anticipating future trends. Alaska warmed rapidly at the end of the last glacial period, ca 15,000–13,000 years ago. Broadly speaking, climate was warmest and driest in the late glacial and early Holocene; subsequently, moisture increased, and the climate gradually cooled. These changes were associated with shifts in vegetation dominance from deciduous woodland and shrubland to white spruce and then to black spruce. The establishment of stands of fire-prone black spruce over large areas of the boreal forest 5000–6000 years ago is linked to an apparent increase in fire frequency, despite the climatic trend to cooler and moister conditions. This suggests that long-term features of the Holocene fire regime are more strongly driven by vegetation characteristics than directly by climate (Chapter 5). White spruce forests show decreased growth in response to recent warming, because warming-induced drought stress is more limiting to growth than is temperature per se (Chapters 5, 11). If these environmental controls persist, projections suggest that continued climate warming will lead to zero net annual growth and perhaps the movement of white spruce to cooler upland forest sites before the end of the twenty-first century. At the southern limit of the Alaskan boreal forest, spruce bark beetle outbreaks have decimated extensive areas of spruce forest, because warmer temperatures have reduced tree resistance to bark beetles and shortened the life cycle of the beetle from two years to one, shifting the tree-beetle interaction in favor of the insect (Chapter 9).

scholarly journals Pinus sylvestris as a missing source of nitrous oxide and methane in boreal forest

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Katerina Machacova ◽  
Jaana Bäck ◽  
Anni Vanhatalo ◽  
Elisa Halmeenmäki ◽  
Pasi Kolari ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Pinus Sylvestris ◽  
Boreal Forest

The effects of fire and stand age on seedling establishment of Pulsatilla patens in a pine-dominated boreal forest

2005 ◽  
Vol 83 (6) ◽  
pp. 688-693 ◽  
Author(s):  
Rein Kalamees ◽  
Kersti Püssa ◽  
Ilkka Vanha-Majamaa ◽  
Kristjan Zobel
Keyword(s):  
Boreal Forest ◽  
Stand Age ◽  
Light Conditions ◽  
Clear Cut ◽  
Forest Sites ◽  
Tree Layer ◽  
Negative Effect ◽  
Scots Pine Forest ◽  
Pulsatilla Patens ◽  
Successional Age

Successful management of disturbance-related endangered plant species requires thorough knowledge concerning their recruitment ecology. Pulsatilla patens (L.) Mill. is found in northern European forests that in the past have been subjected to a periodic wildfire regime and, thus, is supposedly adapted to corresponding changes in forest light conditions and thickness of the moss and litter layers. We tested whether this is true in a field experiment where seeds of P. patens were sown in experimentally burned and control boreal Scots pine forest sites of different successional age (clear-cut, 30 years old, 45 years old). The germination and early establishment of P. patens was enhanced in the experimentally burned conditions and was more successful in younger successional stages. On the other hand, in sites with a tree layer, the germination of P. patens was better in relatively darker areas, suggesting that the negative effect of successional age is probably not a result of changing light conditions, but rather a result of thicker moss and litter layers in the later successional stages.Key words: boreal forest, germination, forest fire, litter layer, Pulsatilla patens, seed sowing.

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