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| Titel |
Sediment properties and CO2 efflux from intact and cleared temperate mangrove forests |
| VerfasserIn |
R. H. Bulmer, C. J. Lundquist, L. Schwendenmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 20 ; Nr. 12, no. 20 (2015-10-28), S.6169-6180 |
| Datensatznummer |
250118143
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| Publikation (Nr.) |
 copernicus.org/bg-12-6169-2015.pdf |
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| Zusammenfassung |
Temperate mangrove forests in New Zealand have increased in area over recent
decades. Expansion of temperate mangroves in New Zealand is associated with
perceived loss of other estuarine habitats, and decreased recreational and
amenity values, resulting in clearing of mangrove forests. In the tropics,
changes in sediment characteristics and carbon efflux have been reported
following mangrove clearance. This is the first study in temperate mangrove
(Avicennia marina) forests investigating the impact of clearing on sediment CO2 efflux
and associated biotic and abiotic factors.
Sediment CO2 efflux rates from intact (168.5 ± 45.8 mmol m−2 d−1) and cleared (133.9 ± 37.2 mmol m−2 d−1) mangrove
forests in New Zealand are comparable to rates measured in tropical mangrove
forests. We did not find a significant difference in sediment CO2
efflux rates between intact and cleared temperate mangrove forests.
Pre-shading the sediment for more than 30 min prior to dark chamber
measurements was found to have no significant effect on sediment CO2
efflux. This suggests that the continuation of photosynthetic CO2
uptake by biofilm communities was not occurring after placement of dark
chambers. Rather, above-ground mangrove biomass, sediment temperature and
chlorophyll a concentration were the main factors explaining the variability
in sediment CO2 efflux in intact mangrove forests. The main factors
influencing sediment CO2 efflux in cleared mangrove forest sites were
sediment organic carbon concentration, nitrogen concentration and sediment
grain size. Our results show that greater consideration should be given
regarding the rate of carbon released from mangrove forest following
clearance and the relative contribution to global carbon emissions. |
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