Soil Respiration in Mini-Beech Stands under Elevated CO2

1997 ◽  
pp. 179-185 ◽  
Author(s):  
Valérie le Dantec ◽  
Eric Dufrêne ◽  
Bernard Saugier
Keyword(s):  
Soil Respiration ◽  
Elevated Co2

scholarly journals Responses of soil respiration to elevated carbon dioxide and nitrogen addition in young subtropical forest ecosystems in China

2010 ◽  
Vol 7 (1) ◽  
pp. 315-328 ◽  
Author(s):  
Q. Deng ◽  
G. Zhou ◽  
J. Liu ◽  
S. Liu ◽  
H. Duan ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Elevated Co2 ◽  
Forest Ecosystems ◽  
N Deposition ◽  
Subtropical Forest ◽  
N Addition ◽  
Above Ground Biomass ◽  
Respiration Rates ◽  
Ambient Co2 ◽  
Ambient N Deposition

Abstract. Global climate change in the real world always exhibits simultaneous changes in multiple factors. Prediction of ecosystem responses to multi-factor global changes in a future world strongly relies on our understanding of their interactions. However, it is still unclear how nitrogen (N) deposition and elevated atmospheric carbon dioxide concentration [CO2] would interactively influence forest floor soil respiration in subtropical China. We assessed the main and interactive effects of elevated [CO2] and N addition on soil respiration by growing tree seedlings in ten large open-top chambers under CO2 (ambient CO2 and 700 μmol mol−1) and nitrogen (ambient and 100 kg N ha−1 yr−1) treatments. Soil respiration, soil temperature and soil moisture were measured for 30 months, as well as above-ground biomass, root biomass and soil organic matter (SOM). Results showed that soil respiration displayed strong seasonal patterns with higher values observed in the wet season (April–September) and lower values in the dry season (October–March) in all treatments. Significant exponential relationships between soil respiration rates and soil temperatures, as well as significant linear relationships between soil respiration rates and soil moistures (below 15%) were found. Both CO2 and N treatments significantly affected soil respiration, and there was significant interaction between elevated [CO2] and N addition (p<0.001, p=0.003, and p=0.006, respectively). We also observed that the stimulatory effect of individual elevated [CO2] (about 29% increased) was maintained throughout the experimental period. The positive effect of N addition was found only in 2006 (8.17% increased), and then had been weakened over time. Their combined effect on soil respiration (about 50% increased) was greater than the impact of either one alone. Mean value of annual soil respiration was 5.32 ± 0.08, 4.54 ± 0.10, 3.56 ± 0.03 and 3.53 ± 0.03 kg CO2 m−2 yr−1 in the chambers exposed to elevated [CO2] and high N deposition (CN), elevated [CO2] and ambient N deposition (CC), ambient [CO2] and high N deposition (NN), and ambient [CO2] and ambient N deposition (CK as a control), respectively. Greater above-ground biomass and root biomass was obtained in the CN, CC and NN treatments, and higher soil organic matter was observed only in the CN treatment. In conclusion, the combined effect of elevated [CO2] and N addition on soil respiration was apparent interaction. They should be evaluated in combination in subtropical forest ecosystems in China where the atmospheric CO2 and N deposition have been increasing simultaneously and remarkably.

scholarly journals Soil Respiration in Relation to Photosynthesis of Quercus mongolica Trees at Elevated CO2

PLoS ONE ◽  
2010 ◽  
Vol 5 (12) ◽  
pp. e15134 ◽  
Author(s):  
Yumei Zhou ◽  
Mai-He Li ◽  
Xu-Bing Cheng ◽  
Cun-Guo Wang ◽  
A-Nan Fan ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Elevated Co2 ◽  
Quercus Mongolica

scholarly journals Effects of Elevated CO2 Concentration and Nitrogen Addition on Soil Respiration in a Cd-Contaminated Experimental Forest Microcosm

Forests ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 260
Author(s):  
Bo Yao ◽  
Qiwu Hu ◽  
Guihua Zhang ◽  
Yafeng Yi ◽  
Meijuan Xiao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Soil Respiration ◽  
Soil Carbon ◽  
Elevated Co2 ◽  
Root Biomass ◽  
Fine Root ◽  
Hydrolytic Enzymes ◽  
N Deposition ◽  
Fine Root Biomass ◽  
N Addition

Forests near rapidly industrialized and urbanized regions are often exposed to elevated CO2, increased N deposition, and heavy metal pollution. To date, the effects of elevated CO2 and/or increased N deposition on soil respiration (Rs) under heavy metal contamination are unclear. In this study, we firstly investigated Rs in Cd-contaminated model forests with CO2 enrichment and N addition in subtropical China. Results showed that Rs in all treatments exhibited similar clear seasonal patterns, with soil temperature being a dominant control. Cadmium addition significantly decreased cumulative soil CO2 efflux by 19% compared to the control. The inhibition of Rs caused by Cd addition was increased by N addition (decreased by 34%) was partially offset by elevated CO2 (decreased by 15%), and was not significantly altered by the combined N addition and rising CO2. Soil pH, microbial biomass carbon, carbon-degrading hydrolytic enzymes, and fine root biomass were also significantly altered by the treatments. A structural equation model revealed that the responses of Rs to Cd stress, elevated CO2, and N addition were mainly mediated by soil carbon-degrading hydrolytic enzymes and fine root biomass. Overall, our findings indicate that N deposition may exacerbate the negative effect of Cd on Rs in Cd-contaminated forests and benefit soil carbon sequestration in the future at increasing atmospheric CO2 levels.

Responses of soil respiration to elevated CO2, air warming, and changing soil water availability in a model old-field grassland

2007 ◽  
Vol 13 (11) ◽  
pp. 2411-2424 ◽  
Author(s):  
SHIQIANG WAN ◽  
RICHARD J. NORBY ◽  
JOANNE LEDFORD ◽  
JAKE F. WELTZIN
Keyword(s):  
Soil Respiration ◽  
Soil Water ◽  
Elevated Co2 ◽  
Water Availability ◽  
Soil Water Availability ◽  
Old Field

Elevated CO2 stimulates grassland soil respiration by increasing carbon inputs rather than by enhancing soil moisture

2011 ◽  
Vol 17 (12) ◽  
pp. 3546-3563 ◽  
Author(s):  
E. Carol Adair ◽  
Peter B. Reich ◽  
Jared J. Trost ◽  
Sarah E. Hobbie
Keyword(s):  
Soil Moisture ◽  
Soil Respiration ◽  
Elevated Co2 ◽  
Grassland Soil

scholarly journals Positive feedback of elevated CO<sub>2</sub> on soil respiration in late autumn and winter

2014 ◽  
Vol 11 (6) ◽  
pp. 8749-8787 ◽  
Author(s):  
L. Keidel ◽  
C. Kammann ◽  
L. Grünhage ◽  
G. Moser ◽  
C. Müller
Keyword(s):  
Soil Respiration ◽  
Elevated Co2 ◽  
Management Practices ◽  
Co2 Enrichment ◽  
Terrestrial Ecosystems ◽  
Winter Period ◽  
Elevated Atmospheric Co2 ◽  
Late Autumn ◽  
Below Ground ◽  
Autumn And Winter

Abstract. Soil respiration of terrestrial ecosystems, a major component in the global carbon cycle is affected by elevated atmospheric CO2 concentrations. However, seasonal differences of feedback effects of elevated CO2 have rarely been studied. At the Giessen Free-Air CO2 Enrichment (GiFACE) site, the effects of +20% above ambient CO2 concentration (corresponds to conditions reached 2035–2045) have been investigated since 1998 in a temperate grassland ecosystem. We defined five distinct annual periods, with respect to management practices and phenological cycles. For a period of three years (2008–2010), weekly measurements of soil respiration were carried out with a survey chamber on vegetation-free subplots. The results revealed a pronounced and repeated increase of soil respiration during late autumn and winter dormancy. Increased CO2 losses during the autumn period (September–October) were 15.7% higher and during the winter period (November–March) were 17.4% higher compared to respiration from control plots. However, during spring time and summer, which are characterized by strong above- and below-ground plant growth, no significant change in soil respiration was observed at the FACE site under elevated CO2. This suggests (i) that soil respiration measurements, carried out only during the vegetative growth period under elevated CO2 may underestimate the true soil-respiratory CO2 loss (i.e. overestimate the C sequestered) and (ii) that additional C assimilated by plants during the growing period and transferred below-ground will quickly be lost via enhanced heterotrophic respiration outside the main vegetation period.

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