The dynamics of benthic nutrient pools and fluxes in tropical mangrove forests
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ID: 293350
1996
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Abstract
Variations in benthic nutrient pools and rates of dissolved nutrient exchange between the forest floor and tidal waters were examined over a 5-yr period in mixed Rhizophora forests lining Coral Creek on Hinchinbrook Island in Queensland, Australia. Seasonal and spatial changes in redox status, porewater and solid-phase nutrients, and in exchange rates were not consistent and did not correlate with temperature. Below-ground roots, on average, accounted for ∼79%, 37% and 26% of bulk sediment TOC, total N and total P pools, respectively. Porewater nutrient concentrations were dominated by Si(OH) 4 + and DON with consistently low levels of NO 2 - + NO 3 - . At most sampling periods, porewater NH 4 + and PO 4 3- concentrations were higher in creek bank sediments than in mangrove sediments indicating uptake by trees. These sediments have low adsorption capacity (K = 0.17-0.47) for NH 4 + , but a moderate capacity (K = 0.8-4.8) for PO 4 3- adsorption. Most measured benthic fluxes of dissolved nitrogen and phosphorus showed uptake by sediments, prop roots and timber lying on the forest floor. Relative (per ha) estimates indicate that low-intertidal Rhizophora forests import ∼2220 mmol N ha -1 d -1 and ∼496 mmol P ha -1 d -1 , with sediments accounting for nearly all uptake while Si is exported (∼2475 mmol ha -1 d -1 . Mid-intertidal forests import ∼1385, 93 and 4720 mmol ha -1 d -1 of N, P and Si, respectively ; sediments, prop roots and timber respectively account for 36%, 62% and 2% of the N import. Mid-intertidal sediments account for all net P uptake, but prop roots and sediments account for 60% and 40% of total Si uptake. On an absolute basis, low-intertidal forests (78 ha total area) in Coral Creek import ∼881 kgN yr -1 , 436 kgP yr -1 and export 1963 kgSi yr -1 , and the mid-intertidal forests (338 ha total area) import ∼2392 kgN yr -1 , 356 kgP yr -1 and 16300 kgSi yr -1 . The sum of these estimates equates to ∼95% of the net annual import of total dissolved N and ∼66% of the net annual import of total dissolved P into the Coral Creek tidal basin from adjacent coastal waters. By difference, ∼14337 kgSi yr -1 is imported into the system. This indicates that mangrove forests are a very efficient sink of dissolved nitrogen, phosphorus and silicon in this tidally-driven coastal ecosystem. This import may be driven by the consistently high rates of microbial and plant growth and productivity within the forests.
| Reference Key |
openalex_W1978990622
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|---|---|
| Authors | Daniel M. Alongi |
| Journal | journal of marine research |
| Year | 1996 |
| DOI |
10.1357/0022240963213475
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| URL | |
| Keywords | Keywords not found |
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