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- W2000997431 abstract "A common method to determine in situ root respiration is to insert root exclusions to sever roots and then to measure soil carbon dioxide (CO 2 ) efflux in and outside the exclusion. We report the use of relatively small root exclusions (15.2 cm diameter plastic pipe) (SREs), installed and measured within a growing season. We switched from long-used, large root exclusions (2.5 m × 3 m) (LREs) for three reasons. First, temperature artifacts were apparent in LREs, likely because increased soil moisture altered soil thermal balance. Second, LREs in dense stands required a relatively low tree density, which then impacted snowpack depth and insolation. Third, the LREs were much more time-consuming to install than SREs. Using a powered mechanical trencher (ditch witch ® ) decreased LRE installation time, but introduced a large edge-effect apparent in soil profile pCO 2 that would obviate trenched plots smaller than 1600 cm 2 . However, when trenches were dug by hand, the distance from the LRE wall had no effect on soil pCO 2 . In a subsequent experiment, SREs were installed by cleanly cutting the forest floor, and then immediately measured. Within 1-3 weeks the SREs provided similar root respiration estimates to those made with LREs that had been in place for nearly 10 months. SREs placed in and outside LREs provided indistinguishable microbial respiration values from one another and to the LREs. We conclude SREs provide root respiration estimates indistinguishable from other methods, even when installed and measured within the same growing season." @default.
- W2000997431 created "2016-06-24" @default.
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- W2000997431 date "2005-09-01" @default.
- W2000997431 modified "2023-09-27" @default.
- W2000997431 title "Small root exclusion collars provide reasonable estimates of root respiration when measured during the growing season of installation" @default.
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- W2000997431 doi "https://doi.org/10.1139/x05-117" @default.
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