Abstract
Mycorrhizal fungi, which can produce a large portion of total soil respiration, respond strongly to global changes such as elevated CO2, N-deposition, and land-use change. Predictions of future ecosystem C sequestration hinge on respiration budgets, but the mycorrhizal influence on total soil respiration remains unknown. In this study, sunflowers (Helianthus annuus) were subjected to various mycorrhizal treatments, and their root and soil systems were enclosed in chambers that continuously monitored belowground (root + mycorrhizal + heterotrophic) CO2 production during plant growth, death, and decomposition. Rhizocosms with high mycorrhizal colonization exhibited higher soil respiration rates as plants matured, an increase that was in proportion to the mycorrhizal stimulation of plant growth. Living mycorrhizal plants behaved like nonmycorrhizal ones in that total rhizocosm respiration had the same relationship to plant mass and the same temperature sensitivity as nonmycorrhizal plants. Upon removal of the shoots though, mycorrhizal plants exhibited the largest relative reduction in respiration resulting in a unique relationship of soil respiration with plant mass. The mycorrhizal influence on heterotrophic respiration merits as much attention from experimenters and modelers as the mycorrhizal contribution to autotrophic respiration.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 335-344 |
| Number of pages | 10 |
| Journal | Plant and Soil |
| Volume | 277 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Dec 2005 |
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Keywords
- Arbuscular mycorrhiza
- Autotrophic
- Heterotrophic
- Soil respiration
- Sunflower
ASJC Scopus subject areas
- Soil Science
- Agronomy and Crop Science
- Plant Science
Cite this
Mycorrhizal status influences the rate but not the temperature sensitivity of soil respiration. / Langley, J. Adam; Johnson, Nancy; Koch, George W.
In: Plant and Soil, Vol. 277, No. 1-2, 12.2005, p. 335-344.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mycorrhizal status influences the rate but not the temperature sensitivity of soil respiration
AU - Langley, J. Adam
AU - Johnson, Nancy
AU - Koch, George W
PY - 2005/12
Y1 - 2005/12
N2 - Mycorrhizal fungi, which can produce a large portion of total soil respiration, respond strongly to global changes such as elevated CO2, N-deposition, and land-use change. Predictions of future ecosystem C sequestration hinge on respiration budgets, but the mycorrhizal influence on total soil respiration remains unknown. In this study, sunflowers (Helianthus annuus) were subjected to various mycorrhizal treatments, and their root and soil systems were enclosed in chambers that continuously monitored belowground (root + mycorrhizal + heterotrophic) CO2 production during plant growth, death, and decomposition. Rhizocosms with high mycorrhizal colonization exhibited higher soil respiration rates as plants matured, an increase that was in proportion to the mycorrhizal stimulation of plant growth. Living mycorrhizal plants behaved like nonmycorrhizal ones in that total rhizocosm respiration had the same relationship to plant mass and the same temperature sensitivity as nonmycorrhizal plants. Upon removal of the shoots though, mycorrhizal plants exhibited the largest relative reduction in respiration resulting in a unique relationship of soil respiration with plant mass. The mycorrhizal influence on heterotrophic respiration merits as much attention from experimenters and modelers as the mycorrhizal contribution to autotrophic respiration.
AB - Mycorrhizal fungi, which can produce a large portion of total soil respiration, respond strongly to global changes such as elevated CO2, N-deposition, and land-use change. Predictions of future ecosystem C sequestration hinge on respiration budgets, but the mycorrhizal influence on total soil respiration remains unknown. In this study, sunflowers (Helianthus annuus) were subjected to various mycorrhizal treatments, and their root and soil systems were enclosed in chambers that continuously monitored belowground (root + mycorrhizal + heterotrophic) CO2 production during plant growth, death, and decomposition. Rhizocosms with high mycorrhizal colonization exhibited higher soil respiration rates as plants matured, an increase that was in proportion to the mycorrhizal stimulation of plant growth. Living mycorrhizal plants behaved like nonmycorrhizal ones in that total rhizocosm respiration had the same relationship to plant mass and the same temperature sensitivity as nonmycorrhizal plants. Upon removal of the shoots though, mycorrhizal plants exhibited the largest relative reduction in respiration resulting in a unique relationship of soil respiration with plant mass. The mycorrhizal influence on heterotrophic respiration merits as much attention from experimenters and modelers as the mycorrhizal contribution to autotrophic respiration.
KW - Arbuscular mycorrhiza
KW - Autotrophic
KW - Heterotrophic
KW - Soil respiration
KW - Sunflower
UR - http://www.scopus.com/inward/record.url?scp=28444447419&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=28444447419&partnerID=8YFLogxK
U2 - 10.1007/s11104-005-7932-3
DO - 10.1007/s11104-005-7932-3
M3 - Article
VL - 277
SP - 335
EP - 344
JO - Plant and Soil
JF - Plant and Soil
SN - 0032-079X
IS - 1-2
ER -