Fine-root respiration in a loblolly pine (Pinus taeda L.) forest exposed to elevated CO2 and N fertilization
Drake, JE; Stoy, PC; Jackson, RB; Delucia, EH
HERO ID
2470299
Reference Type
Journal Article
Year
2008
Language
English
PMID
| HERO ID | 2470299 |
|---|---|
| In Press | No |
| Year | 2008 |
| Title | Fine-root respiration in a loblolly pine (Pinus taeda L.) forest exposed to elevated CO2 and N fertilization |
| Authors | Drake, JE; Stoy, PC; Jackson, RB; Delucia, EH |
| Journal | Plant, Cell and Environment |
| Volume | 31 |
| Issue | 11 |
| Page Numbers | 1663-1672 |
| Abstract | Forest ecosystems release large amounts of carbon to the atmosphere from fine-root respiration (R(r)), but the control of this flux and its temperature sensitivity (Q(10)) are poorly understood. We attempted to: (1) identify the factors limiting this flux using additions of glucose and an electron transport uncoupler (carbonyl cyanide m-chlorophenylhydrazone); and (2) improve yearly estimates of R(r) by directly measuring its Q(10)in situ using temperature-controlled cuvettes buried around intact, attached roots. The proximal limits of R(r) of loblolly pine (Pinus taeda L.) trees exposed to free-air CO(2) enrichment (FACE) and N fertilization were seasonally variable; enzyme capacity limited R(r) in the winter, and a combination of substrate supply and adenylate availability limited R(r) in summer months. The limiting factors of R(r) were not affected by elevated CO(2) or N fertilization. Elevated CO(2) increased annual stand-level R(r) by 34% whereas the combination of elevated CO(2) and N fertilization reduced R(r) by 40%. Measurements of in situ R(r) with high temporal resolution detected diel patterns that were correlated with canopy photosynthesis with a lag of 1 d or less as measured by eddy covariance, indicating a dynamic link between canopy photosynthesis and root respiration. These results suggest that R(r) is coupled to daily canopy photosynthesis and increases with carbon allocation below ground. |
| Doi | 10.1111/j.1365-3040.2008.01869.x |
| Pmid | 18684240 |
| Wosid | WOS:000259817700012 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | carbon cycle; Duke FACE; FACTS-1; global climate change; net ecosystem exchange; soil respiration |