Carbon sinks in mangroves and their implications to carbon budget of tropical coastal ecosystems
Nearly 50% of terrigenous materials delivered to the world's oceans are delivered through just twenty-one major river systems. The tropical regions of the biosphere are the most biogeochemically active coastal regions and represent potentially important sinks of C in the biosphere. Rates of net primary productivity and biomass accumulation depend on a combination of global factors such as latitude and local factors such as hydrology. Global estimates of export from coastal wetlands is about 0.08 Pg C/yr compared to input of 0.36 Pg C/yr from rivers to coastal ecosystems. Total allochthonous input of 0.44 Pg C/yr is lower than in situ production of 6.65 Pg C/yr. The trophic condition of coastal ecosystems depends on the fate of this total supply of 7.09 Pg C/yr as either contributing to system respiration, or becoming permanently stored in sediments. Accumulation of carbon in coastal sediments is only 0.41 Pg C/yr; about 6% of the total input. The NEP of coastal wetlands also contribute to the C sink of coastal margins, but the source of this C is part of the terrestrial C exchange with the atmosphere. Accumulation of C in wood and sediments of coastal wetlands is 0.205 Pg C/yr, half the estimate for sequestering of C in coastal sediments. Burial of C in shelf sediments is probably underestimated, particularly in tropical river-dominated coastal margins. Better estimates of these two C sinks in the tropics, coastal wetlands and shelf sediments, is needed to better understand the contribution of coastal ecosystems to the global carbon budget.
| Main Authors: | , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Published: |
Países Bajos Kluwer Academic Publishers
1992
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| Subjects: | BIOMASA, CARBONO, ALMACENAMIENTO, FOTOSINTESIS, MANGLES, AREA COSTERA, ECOSISTEMA, CURSOS DE AGUA, MEDICION, MODELOS, PRODUCCION DE MADERA, ECUACIONES ALOMETRICAS, BIOMASA AEREA, FIJACION DE CARBONO, |
| Online Access: | https://link.springer.com/article/10.1007/BF00477106 |
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