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| Titel |
Spatial and temporal variation in the soil CO2 efflux in a subtropical
broadleaved forest in Okinawa, Japan |
| VerfasserIn |
Kazuho Matsumoto, Kei Terasawa, Shingo Taniguchi, Atsushi Takashima, Ayumi Katayama, Mizue Ohashi |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126001
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| Publikation (Nr.) |
 EGU/EGU2016-5668.pdf |
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| Zusammenfassung |
| Soil CO2 efflux (Rs) is a major component of the carbon emissions from terrestrial
ecosystems. The spatiotemporal variation in Rs and its dependency on biotic and abiotic
factors have been clarified in various ecosystems. It is thought that subtropical ecosystem RS
values are slightly higher than those of temperate ecosystems, but much smaller than those of
tropical ecosystems (Bond-Lamberty & Thomson, 2010), but compared with temperate and
tropical ecosystems there are limited relevant data. This study examined spatial (within
stand-scale) and temporal (hourly to seasonal) variation in Rs in a subtropical evergreen
broad-leaved forest on Okinawa Island, Japan. We measured Rs using a closed dynamic
chamber at 60 locations within a 0.15-ha plot once a month in 2013 and 2014. In
addition, Rs was measured continuously using automated chambers at two locations
within the same plot in 2015. The annual average Rs value (5.5 μmol m−2 s−1)
obtained from the monthly manual measurements was comparable with values reported
for tropical rainforests and larger than those for temperate forests. At our site, Rs
showed clear seasonal variation depending on soil temperature, unlike in tropical
rainforests, which lack seasonality. The spatial variation in Rs was positively correlated
with the ratio of litter cover area per unit soil area, which was larger on the ridge
and smaller on the slope. We propose that the amount of litter, as a material for
heterotrophic respiration, largely characterises the spatial variation in Rs at this site, with
a relatively small contribution from autotrophic respiration by plant roots. The
results clarify that Rs values in subtropical forests in Okinawa have characteristics
between those of temperate forests (seasonality) and tropical rainforests (large Rs). |
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