Phenology and its role in carbon dioxide exchange processes in northern peatlands

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Phenology and its role in carbon dioxide exchange processes in northern peatlands. / Kross, Angela S. E.; Roulet, Nigel T.; Moore, Tim R.; Lafleur, Peter M.; Humphreys, Elyn R.; Seaquist, Jonathan; Flanagan, Lawrence B.; Aurela, Mika.

In: Journal of Geophysical Research - Biogeosciences, Vol. 119, No. 7, 2014, p. 1370-1384.

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Harvard

Kross, ASE, Roulet, NT, Moore, TR, Lafleur, PM, Humphreys, ER, Seaquist, J, Flanagan, LB & Aurela, M 2014, 'Phenology and its role in carbon dioxide exchange processes in northern peatlands', Journal of Geophysical Research - Biogeosciences, vol. 119, no. 7, pp. 1370-1384. https://doi.org/10.1002/2014JG002666

APA

Kross, A. S. E., Roulet, N. T., Moore, T. R., Lafleur, P. M., Humphreys, E. R., Seaquist, J., Flanagan, L. B., & Aurela, M. (2014). Phenology and its role in carbon dioxide exchange processes in northern peatlands. Journal of Geophysical Research - Biogeosciences, 119(7), 1370-1384. https://doi.org/10.1002/2014JG002666

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MLA

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Author

Kross, Angela S. E. ; Roulet, Nigel T. ; Moore, Tim R. ; Lafleur, Peter M. ; Humphreys, Elyn R. ; Seaquist, Jonathan ; Flanagan, Lawrence B. ; Aurela, Mika. / Phenology and its role in carbon dioxide exchange processes in northern peatlands. In: Journal of Geophysical Research - Biogeosciences. 2014 ; Vol. 119, No. 7. pp. 1370-1384.

RIS

TY - JOUR

T1 - Phenology and its role in carbon dioxide exchange processes in northern peatlands

AU - Kross, Angela S. E.

AU - Roulet, Nigel T.

AU - Moore, Tim R.

AU - Lafleur, Peter M.

AU - Humphreys, Elyn R.

AU - Seaquist, Jonathan

AU - Flanagan, Lawrence B.

AU - Aurela, Mika

PY - 2014

Y1 - 2014

N2 - Ecosystem phenology plays an important role in carbon exchange processes and can be derived from continuous records of carbon dioxide (CO2) exchange data. In this study we examined the potential use of phenological indices for characterizing cumulative annual CO2 exchange in four contrasting northern peatland ecosystems. We used the approach of Jonsson and Eklundh (2004) to derive a set of phenological indices based on the daily time series of gross primary production (GPP), ecosystem respiration (R-e), and net ecosystem production (NEP) measured in the four peatland sites. The main objectives of this study were (a) to examine the variation in phenological indices across sites and (b) to determine the relationships among phenological indices, environmental conditions, and cumulative annual CO2 exchange. The phenological index used to define the "start of the growing season" showed good potential for differentiation among sites based on their average annual site GPP. Sites with earlier growing seasons had the highest average annual site GPP. The "peak CO2 exchange rate" phenological index performed best in reflecting variations among sites and for estimating annual values of GPP, R-e, and NEP (Pearson correlation coefficients ranged between 0.77 and 0.99, p<0.05 for all.). The phenological indices and annual GPP, R-e, and NEP were sensitive to winter (January-March) and summer (July-September) temperature and precipitation, but correlations, though significant, were weak.

AB - Ecosystem phenology plays an important role in carbon exchange processes and can be derived from continuous records of carbon dioxide (CO2) exchange data. In this study we examined the potential use of phenological indices for characterizing cumulative annual CO2 exchange in four contrasting northern peatland ecosystems. We used the approach of Jonsson and Eklundh (2004) to derive a set of phenological indices based on the daily time series of gross primary production (GPP), ecosystem respiration (R-e), and net ecosystem production (NEP) measured in the four peatland sites. The main objectives of this study were (a) to examine the variation in phenological indices across sites and (b) to determine the relationships among phenological indices, environmental conditions, and cumulative annual CO2 exchange. The phenological index used to define the "start of the growing season" showed good potential for differentiation among sites based on their average annual site GPP. Sites with earlier growing seasons had the highest average annual site GPP. The "peak CO2 exchange rate" phenological index performed best in reflecting variations among sites and for estimating annual values of GPP, R-e, and NEP (Pearson correlation coefficients ranged between 0.77 and 0.99, p<0.05 for all.). The phenological indices and annual GPP, R-e, and NEP were sensitive to winter (January-March) and summer (July-September) temperature and precipitation, but correlations, though significant, were weak.

U2 - 10.1002/2014JG002666

DO - 10.1002/2014JG002666

M3 - Article

VL - 119

SP - 1370

EP - 1384

JO - Journal of Geophysical Research - Biogeosciences

JF - Journal of Geophysical Research - Biogeosciences

SN - 2169-8953

IS - 7

ER -