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|Title:||Seasonal and Interannual Patterns of Carbon and Water Fluxes of a Poplar Plantation under Peculiar Eco-climatic Conditions|
|Authors:||MIGLIAVACCA Mirco; MERONI Michele; MANCA Giovanni; MATTEUCCI Giorgio; MONTAGNANI Leonardo; GRASSI Giacomo; ZENONE Terenzio; TEOBALDELLI Maurizio; GODED BALLARIN Ignacio; COLOMBO Roberto; SEUFERT Guenther|
|Citation:||AGRICULTURAL AND FOREST METEOROLOGY vol. 149 no. 9 p. 1460-1476|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in Journals|
|Abstract:||This paper reports 3 years of measurements (2002-2004) of the net ecosystem exchange (NEE) over a poplar plantation (Populus x canadensis Moench, Clone I-214), located in Northern Italy, using the eddy covariance technique. The study evaluates both the seasonal and interannual variability of the NEE, gross primary production (GPP), ecosystem respiration (RECO) and evapotranspiration (ET) over 3 growing seasons and analyzes the main factors controlling the carbon and water balance under different meteorological and environmental conditions experienced by the plantation. In particular, during 2003 the climatic conditions were exceptionally severe with the highest mean temperatures and the lowest precipitations observed on the study area in the last 50 years. In addition, during the late summer 2004 the plantation was affected by a natural disturbance (disease) caused by the fall webworm¿s larvae (Hyphantria cunea). The analysis of the light curve parameters and stomatal conductance confirmed that the reduction of CO2 uptake during summer 2003 was controlled to either stomatal or non-stomatal limitations induced by high temperatures and high atmospheric evaporative demand rather than a water stress induced by the lower SWC of the upper soil layer. Light curve residuals analysis showed a strong control of high temperatures rather than the atmospheric vapour pressure deficit, therefore we hypothized that the reduction of the CO2 uptakes were mainly due to non-stomatal limitations (i.e. high temperatures closed to the threshold of damage of polar leaves). The interannual variability of the NEE and in the ratio RECO/GPP was found higher than that reported in other studies on deciduous forests, this finding may indicate that fast growing plantation are very sensible to climatic variability, extreme events, stress conditions and disease, which increase both in intensity and frequency is very likely under a climate change scenario.|
|JRC Institute:||Institute for Environment and Sustainability|
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