行政院國家科學委員會專題研究計畫成果報告:氣候變遷對生態系光合作用的影響
Date Issued
2005
2005-07-31
Date
2005
2005-07-31
Author(s)
DOI
932111M002011
Abstract
Increases in atmospheric CO2 concentration not only affects climate variables such as
precipitation, water vapor concentration, and air temperature, but also affects intrinsic
ecosystem physiological properties such as the maximum carboxylation capacity and
stomatal conductance. De-convolving these two effects remains uncertain in
biosphere-atmosphere water and carbon cycling. Using a simplified analytical net
ecosystem CO2 exchange (NEE) model, tested with recently collected flux measurements
in a humid grassland ecosystem in Ireland, we assess how much projected climate shifts
affect net canopy photosynthesis (A) without physiological adjustments and contrast those
findings with physiological adjustments already reported for several grassland ecosystems.
Our analysis suggests that the intrinsic grassland ecosystem physiological adjustment of A
is about forty five times more important than the resulting climatic forcing shifts from the
IS92a scenario (and a double of atmospheric CO2 concentration). Implications to
afforestation policy and future experimental efforts to quantify the carbon sink from humid
grassland ecosystems are also discussed.
Subjects
photosynthesis
climate perturbation
net ecosystem exchange
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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