scholarly journals Biophysical controls on rhizospheric and heterotrophic components of soil respiration in a boreal black spruce stand

2008 ◽  
Vol 28 (2) ◽  
pp. 161-171 ◽  
Author(s):  
D. Gaumont-Guay ◽  
T. A. Black ◽  
A. G. Barr ◽  
R. S. Jassal ◽  
Z. Nesic
Keyword(s):  
Soil Respiration ◽  
Black Spruce ◽  
Biophysical Controls

Soil and root respiration in mature Alaskan black spruce forests that vary in soil organic matter decomposition rates

2005 ◽  
Vol 35 (1) ◽  
pp. 161-174 ◽  
Author(s):  
Jason G Vogel ◽  
David W Valentine ◽  
Roger W Ruess
Keyword(s):  
Soil Respiration ◽  
Root Respiration ◽  
Forest Type ◽  
Black Spruce ◽  
Decomposition Rates ◽  
Spruce Forests ◽  
Moisture Deficit ◽  
Soil Temperatures ◽  
Boreal Ecosystem ◽  
Site Identification

Climate warming at high latitudes is expected to increase root and microbial respiration and thus cause an increase in soil respiration. We measured the root and microbial components of soil respiration near Fairbanks, Alaska, in 2000 and 2001, in three black spruce (Picea mariana (Mill) B.S.P.) forests. We hypothesized faster decomposition correlates with greater amounts of both root and microbial contributions to soil respiration. Contrary to our prediction, the site with the coolest summer soil temperatures and slowest decomposition (site identification "high-np") had significantly (p < 0.05) greater growing season soil respiration (485 g C·m–2·year–1) than the two other sites (372 and 332 g C·m–2·year–1). Spruce C allocation to root respiration was significantly greater, and fine-root N concentration was 10% and 12% greater (p < 0.05) at high-np than at the other two sites. High-np spruce foliage was also more enriched in 13C and depleted in 15N, suggesting either lower available moisture or slower N turnover. Either factor could drive greater C allocation to roots; however, a literature review suggests moisture deficit corresponds to greater C allocation to roots in black spruce forests across the boreal ecosystem. Controls on spruce C allocation need to be resolved before making the generalization that soil respiration will increase with warming in this forest type.

The role of soil drainage class in carbon dioxide exchange and decomposition in boreal black spruce (Picea mariana) forest stands

2010 ◽  
Vol 40 (11) ◽  
pp. 2123-2134 ◽  
Author(s):  
Kimberly P. Wickland ◽  
Jason C. Neff ◽  
Jennifer W. Harden
Keyword(s):  
Carbon Dioxide ◽  
Soil Respiration ◽  
Picea Mariana ◽  
Black Spruce ◽  
Soil Drainage ◽  
Forest Stands ◽  
Drainage Class ◽  
Surface Decomposition ◽  
Soc Stocks

Black spruce (Picea mariana (Mill.) B.S.P.) forest stands range from well drained to poorly drained, typically contain large amounts of soil organic carbon (SOC), and are often underlain by permafrost. To better understand the role of soil drainage class in carbon dioxide (CO2) exchange and decomposition, we measured soil respiration and net CO2 fluxes, litter decomposition and litterfall rates, and SOC stocks above permafrost in three Alaska black spruce forest stands characterized as well drained (WD), moderately drained (MD), and poorly drained (PD). Soil respiration and net CO2 fluxes were not significantly different among sites, although the relation between soil respiration rate and temperature varied with site (Q10: WD > MD > PD). Annual estimated soil respiration, litter decomposition, and groundcover photosynthesis were greatest at PD. These results suggest that soil temperature and moisture conditions in shallow organic horizon soils at PD were more favorable for decomposition compared with the better drained sites. SOC stocks, however, increase from WD to MD to PD such that surface decomposition and C storage are diametric. Greater groundcover vegetation productivity, protection of deep SOC by permafrost and anoxic conditions, and differences in fire return interval and (or) severity at PD counteract the relatively high near-surface decomposition rates, resulting in high net C accumulation.

Harvesting and slash piling affects soil respiration, soil temperature, and soil moisture regimes in Newfoundland boreal forests

2009 ◽  
Vol 89 (3) ◽  
pp. 343-355 ◽  
Author(s):  
M. T. Moroni ◽  
P. Q. Carter ◽  
D. A.J. Ryan
Keyword(s):  
Soil Moisture ◽  
Soil Respiration ◽  
Soil Temperature ◽  
Black Spruce ◽  
Abies Balsamea ◽  
Forest Harvesting ◽  
Balsam Fir ◽  
Minor Role ◽  
Respiration Rates ◽  
A Minor

The effect of harvesting and slash piling on soil respiration, temperature and moisture was examined in a balsam fir (Abies balsamea) and a black spruce (Picea marinara) forest located in western Newfoundland, Canada, 2 mo to 2.5 yr following harvesting. Within 4 mo of harvesting, soil temperature, moisture, and soil respiration rates were affected by harvesting and slash piling. Clearcut areas without slash (CC-S) had significantly lower soil respiration rates than uncut forests (F). However, clearcut areas with slash cover (CC+S) had significantly higher soil respiration rates than CC-S. When harvested areas with and without slash were combined, harvesting decreased soil respiration in the black spruce forest but had no effect on soil respiration in the balsam fir forest. Harvesting increased soil temperatures at 10 cm, however CC+S temperatures were cooler than CC-S temperatures. Harvested areas tended to dry faster than F, although soil moisture levels at >3.5 cm were not significantly depleted. However, there was evidence of soil drying at <3.5 cm. Soil temperature (at 10 cm) at the time of measurement was most strongly correlated to rates of soil respiration. Temporal variability and treatment effects (harvesting and slash piling) played a minor role in explaining soil respiration rates when variations in soil respiration were adjusted for 10-cm soil temperature,. Soil moisture levels (3.5-9.5 cm depth), which did not vary widely, also played a minor role in explaining soil respiration rates.Key words: Clearcut, Abies balsamea, Picea marinara, carbon dioxide, greenhouse gas

Succession-driven changes in soil respiration following fire in black spruce stands of interior Alaska

2006 ◽  
Vol 80 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Katherine P. O’Neill ◽  
Daniel D. Richter ◽  
Eric S. Kasischke
Keyword(s):  
Soil Respiration ◽  
Black Spruce ◽  
Interior Alaska ◽  
Spruce Stands

Antitranspirant action of abscisic acid and ten synthetic analogs in black spruce

1990 ◽  
Vol 80 (3) ◽  
pp. 365-370 ◽  
Author(s):  
Terence J. Blake ◽  
Weixing Tan ◽  
Suzanne R. Abrams
Keyword(s):  
Abscisic Acid ◽  
Black Spruce ◽  
Synthetic Analogs

LBA-ECO CD-04 SOIL RESPIRATION, KM 83 TOWER SITE, TAPAJOS NATIONAL FOREST, BRAZIL

2011 ◽  
Author(s):  
M.L. GOULDEN, ◽  
H.R. DA ROCHA, ◽  
S.D. MILLER, ◽  
H.C. DE FREITAS,
Keyword(s):  
Soil Respiration ◽  
National Forest
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