Abstract
The eddy correlation method was used to measure the net ecosystem exchange of carbon dioxide continuously from April 1990 to December 1991 in a deciduous forest in central Massachusetts. The annual net uptake was 3.7 +/- 0.7 metric tons of carbon per hectare per year. Ecosystem respiration, calculated from the relation between nighttime exchange and soil temperature, was 7.4 metric tons of carbon per hectare per year, implying gross ecosystem production of 11.1 metric tons of carbon per hectare per year. The observed rate of accumulation of carbon reflects recovery from agricultural development in the 1800s. Carbon uptake rates were notably larger than those assumed for temperate forests in global carbon studies. Carbon storage in temperate forests can play an important role in determining future concentrations of atmospheric carbon dioxide.
Highlights
Theeddycorrelationmethodwas used to measurethe netecosystem exchange of carbon dioxidecontinuouslyfromApril1990 to December 1991 in a deciduousforest in central Massachusetts.The annualnet uptakewas 3.7 ? 0.7 metrictons of carbonper hectare peryear
Mean rates for carbon uptake by aggrading temperate forests have been estimated as 2.5 metric tons per hectare per year for 50 years after disturbance, near zero at longer times [3]
Models for global ratesof carbonuptakeassumedthat temperate forestsaccrete carbon linearlywith time duringsuccession[3], with equilibrium carbonstocksestimatedon the basisof allometricrelations derived from a small numberof destructiveharvests(9-i 1) and with limited informationon belowground components [10]
Summary
Theeddycorrelationmethodwas used to measurethe netecosystem exchange of carbon dioxidecontinuouslyfromApril1990 to December 1991 in a deciduousforest in central Massachusetts.The annualnet uptakewas 3.7 ? 0.7 metrictons of carbonper hectare peryear. Boehler et al [2] found that iron melts at substantially lower pressures than did Williams et al [4]. Jeanloz [1] did not find any reaction in his studies at least to a pressure of 40 GPa. The melting data of Shen et a!.
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