What question did this study set out to answer?

To quantify total ecosystem respiration and partition carbon dioxide efflux among heterotrophic, root, stem, and foliage components in a young ponderosa pine plantation.

March 1, 2001Tree PhysiologyOpen Access

Ecosystem respiration in a young ponderosa pine plantation in the Sierra Nevada Mountains, California

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Authors

MXM. XuChinese Academy of Agricultural Sciences TDTerry A. DeBiaseUniversity of California, Berkeley YQYe QiFujian Normal University

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Implication

Field modeling study demonstrates soil efflux dominates ecosystem respiration in young ponderosa pine stands, suggesting air and soil temperatures reliably predict carbon loss.

Key Points

To quantify total ecosystem respiration and partition carbon dioxide efflux among heterotrophic, root, stem, and foliage components in a young ponderosa pine plantation.
Measured component-specific respiration at selected sampling locations in a Pinus ponderosa plantation in California from June to October 1998.
Scaled localized flux measurements to the stand scale using relationships based on microclimate variables and vegetation characteristics.
Modeled ecosystem respiration against daily mean air and soil temperatures using exponential curves and multiple linear regression.
Mean daily ecosystem respiration was 5.7 +/- 1.3 mumol m-2 s-1, partitioned into soil-surface CO2 efflux (67%), foliage respiration (23%), and stem and branch respiration (10%).
Root respiration accounted for 47% of soil-surface CO2 efflux, while current-year needles contributed 40% of tree needle respiration and shrub leaves contributed 24% of foliage respiration.
Ecosystem respiration correlated exponentially with air temperature (r2 = 0.85) and soil temperature (r2 = 0.87), with combined linear regression explaining 91% of total flux variation.

Cite This Study

Xu et al. (2001) studied this question.

synapsesocial.com/papers/6a845bb1d7bfb55d35730d52 https://doi.org/10.1093/treephys/21.5.309

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Implication

Field modeling study demonstrates soil efflux dominates ecosystem respiration in young ponderosa pine stands, suggesting air and soil temperatures reliably predict carbon loss.

Ecosystem respiration in a young ponderosa pine plantation in the Sierra Nevada Mountains, California

Discussion

Member takes

Implication

Key Points

Cite This Study

Ecosystem respiration in a young ponderosa pine plantation in the Sierra Nevada Mountains, California

Discussion

Member takes

Implication

Key Points

Cite This Study

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