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- W2163412424 abstract "Soil surface CO2 efflux (Fc) in a 45-year-old northern larch forest was continuously measured, using a multichannel automated chamber system, between June and October, 2001. The results were compared with periodic measurements obtained at the same site with an LI-6400 chamber system and an open-top chamber system, and also with continuous measurements obtained at the same site with a soil CO2 gradient system. The diurnal and seasonal changes in Fc measured by the automated chamber and soil CO2 gradient approaches followed the soil temperature patterns. We found only a weak correlation between Fc and soil moisture, probably because the volumetric soil moisture (30–40% at 95% confidence interval) in this larch forest favors microbial and root activities. Among the four approaches, the LI-6400 chamber yielded a substantially higher Fc value than the other three approaches. The open-top chamber gave higher values of Fc than the automated chamber at efflux rates below 3.0 μmol m−2 s−1 and lower values above this level; however, the results of both these approaches were closely correlated (R2=0.87, n=105). Although Fc measured with the soil CO2 gradient approach was, on average, 45% higher than the results of the automated chamber approach, the correlation between the two techniques was good (R2=0.77, n=2945). The annual soil CO2 efflux estimated by the automated chamber (665 g C m−2) and open-top chamber (720 g C m−2) matched the total annual ecosystem respiration, as estimated by the above-canopy eddy covariance method. However, the LI-6400 chamber and soil CO2 gradient approaches gave higher values for annual soil CO2 efflux than the eddy covariance method." @default.
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- W2163412424 date "2004-05-01" @default.
- W2163412424 modified "2023-10-16" @default.
- W2163412424 title "In situ comparison of four approaches to estimating soil CO2 efflux in a northern larch (Larix kaempferi Sarg.) forest" @default.
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- W2163412424 doi "https://doi.org/10.1016/j.agrformet.2003.10.002" @default.
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