LBA-ECO CD-08 COARSE WOOD LITTER RESPIRATION AND DECOMPOSITION, MANAUS, BRAZIL

2008 ◽  
Author(s):  
J. Q. CHAMBERS, ◽  
L. V. FERREIRA, ◽  
N. HIGUCHI, ◽  
J. M. MELACK, ◽  
A. D. NOBRE, ◽  
...  
Keyword(s):  
Litter Respiration

scholarly journals Influence of Long-Term Thinning on the Biomass Carbon and Soil Respiration in a Larch (Larix gmelinii) Forest in Northeastern China

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Huimei Wang ◽  
Wei Liu ◽  
Wenjie Wang ◽  
Yuangang Zu
Keyword(s):  
Soil Respiration ◽  
Temperature Sensitivity ◽  
Forest Ecosystems ◽  
Mineral Soil ◽  
Biomass Accumulation ◽  
Northeastern China ◽  
Microbial Composition ◽  
Litter Respiration ◽  
Few Data

Thinning management is used to improve timber production, but only a few data are available on how it influences ecosystem C sink capacity. This study aims to clarify the effects of thinning on C sinks of larch plantations, the most widespread forests in Northeastern China. Both C influx from biomass production and C efflux from each soil respiration component and its temperature sensitivity were determined for scaling-up ecosystem C sink estimation: microbial composition is measured for clarifying mechanism for respiratory changes from thinning treatment. Thinning management induced 6.23 mol C m−2 yr−1increase in biomass C, while the decrease in heterotrophic respiration (Rh) at the thinned sites (0.9 mol C m−2 yr−1) has enhanced 14% of this biomass C increase. This decrease inRhwas a sum of the 42% decrease (4.1 mol C m−2 yr−1) in litter respiration and 3.2 mol C m−2 yr−1more CO2efflux from mineral soil in thinned sites compared with unthinned control. Increases in temperature, temperature sensitivity, alteration of litters, and microbial composition may be responsible for the contrary changes inRhfrom mineral soil and litter respiration, respectively. These findings manifested that thinning management of larch plantations could enhance biomass accumulation and decrease respiratory efflux from soil, which resulted in the effectiveness improvement in sequestrating C in forest ecosystems.

An Analysis of Litter Respiration at Different Temperatures

1976 ◽  
Vol 25 (2) ◽  
pp. 139
Author(s):  
J. N. R. Jeffers ◽  
Doreen M. Howard ◽  
P. J. A. Howard
Keyword(s):  
Litter Respiration ◽  
Different Temperatures

Decoupling litter respiration from whole-soil respiration along an elevation gradient in a Rocky Mountain mixed-conifer forest

2014 ◽  
Vol 44 (5) ◽  
pp. 432-440 ◽  
Author(s):  
Erin M. Berryman ◽  
John D. Marshall ◽  
Kathleen Kavanagh
Keyword(s):  
Soil Respiration ◽  
Elevation Gradient ◽  
Rocky Mountain ◽  
Mean Annual Temperature ◽  
Conifer Forest ◽  
Atmospheric Humidity ◽  
Positive Interaction ◽  
Mixed Conifer Forest ◽  
Litter Respiration ◽  
Northern Idaho

Litter respiration (RL) represents a significant portion of whole-soil respiration (RS) in forests, yet climatic correlations with RL have seldom been examined. Because RL is reduced at low humidities and RS is reduced at low temperatures, these components may show divergent trends with elevation in western North American forests. Using a litter-removal experiment along a forested 750 m elevation gradient in the Rocky Mountains of northern Idaho, USA, we measured RS on soils from which litter had been removed (RNL) and, by difference, RL. Mean RL represented 16% (SE = 2%) of mean RS from July through October of 2007 and 2008. RS was highest at warmer times and sites, and was not suppressed by low soil moisture. In contrast, RL was highest at cooler times, when humidity and gravimetric litter water content were highest. RL was highest at mid-elevations, representing neither the warmest nor wettest sites. Sixty-three percent of variability in site RL was explained by both mean annual temperature (MAT) and mean annual relative humidity (MARH), including a positive interaction effect between MAT and MARH. Our results imply that the equilibration of litter with atmospheric humidity is an important control over litter respiration rates.

Effect of heavy metals and mineral nutrients on forest litter respiration rate

1994 ◽  
Vol 84 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Ryszard Laskowski ◽  
Maciej Maryański ◽  
Maria Niklińska
Keyword(s):  
Heavy Metals ◽  
Respiration Rate ◽  
Forest Litter ◽  
Mineral Nutrients ◽  
Litter Respiration

scholarly journals Decreased carbon limitation of litter respiration in a mortality-affected piñon-juniper woodland

2012 ◽  
Vol 9 (10) ◽  
pp. 14475-14501 ◽  
Author(s):  
E. Berryman ◽  
J. D. Marshall ◽  
T. Rahn ◽  
M. Litvak ◽  
J. Butnor
Keyword(s):  
Soil Respiration ◽  
Temperature Sensitivity ◽  
Water Availability ◽  
Microbial Respiration ◽  
Mineral Soil ◽  
Substrate Availability ◽  
Litter Respiration ◽  
Labile C ◽  
Juniper Woodland ◽  
C Limitation

Abstract. Microbial respiration depends on microclimatic variables and carbon (C) substrate availability, all of which are altered when ecosystems experience major disturbance. Widespread tree mortality, currently affecting piñon-juniper ecosystems in Southwestern North America, may affect C substrate availability in several ways; for example, via litterfall pulses and loss of root exudation. To determine piñon mortality effects on C and water limitation of microbial respiration, we applied field amendments (sucrose and water) to two piñon-juniper sites in central New Mexico, USA: one with a recent (< 1 yr), experimentally-induced mortality event and a nearby site with live canopy. We monitored the respiration response to water and sucrose applications to the litter surface and to the underlying mineral soil surface, testing the following hypotheses: (1) soil respiration in a piñon-juniper woodland is water- and labile C-limited in both the litter layer and mineral soil; (2) water and sucrose applications increase temperature sensitivity of respiration; (3) the mortality-affected site will show a reduction in C limitation in the litter; (4) the mortality-affected site will show an enhancement of C limitation in the mineral soil. Litter respiration at both sites responded to increased water availability, yet surprisingly, mineral soil respiration was not limited by water. Temperature sensitivity was enhanced by some of the sucrose and water treatments. Consistent with hypothesis 3, C limitation of litter respiration was lower at the recent mortality site compared to the intact canopy site. Results following applications to the mineral soil suggest the presence of abiotic effects of increasing water availability, precluding our ability to measure labile C limitation in soil. Widespread piñon mortality may decrease labile C limitation of litter respiration, at least during the first growing season following mortality.

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