Negative relationships between the nutrient and carbohydrate content of the seagrass Thalassia testudinum (original) (raw)
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Carbon storage by seagrass community.pdf
We analyzed stored carbon in the Above Ground Biomass (AGB) and Below Ground Biomass (BGB) of three seagrass species in Koswari, Kariyachalli and Vilanguchalli during March, 2014 at Gulf of Mannar. Soil Organic Carbon (SOC) was also monitored simultaneously to evaluate the amount of stored carbon in the underlying soil of the intertidal mud flat in the study area. In the selected quadrate, the order of abundance of the seagrass species was Cymodocea serrulata > Thalassia hemprichii > Halophila ovalis. Pronounced variation was observed between AGB and BGB in all the three species. The ratio of AGB and BGB ranged from 1:1.25-1:1.30. The Above Ground Carbon (AGC) and Below Ground Carbon (BGC) also exhibited significant variation with highest value in Cymodocea serrulata followed by Thalassia hemprichii and Halophila ovalis.
Marine Ecology Progress Series
The availability of nitrogen in sediment phytodetritus to seagrass was investigated in 5 tropical species (Thalassia hemprichii, Halodule uninervis, H, pinifolia, Halophila ovalis/ovata and Syringodium isoetifolium) from Indonesia. N-15-labeled phytodetritus was injected into the sediment and the appearance of N-15 in the roots, the rhizomes and the leaves of the plants were measured after 1, 2, 4 and 8 d. The transfer of N-15 from sediment phytodetritus to the plant tissues was very rapid (within 1 d) and continued over the 8 d period, indicating an efficient retention of the phytodetritus and a net mineralization of nitrogen rather than an immobilisation by bacteria. Relative enrichment of roots versus leaves indicated that N-15 was taken up by the roots and then transferred to the leaves. The combined efficiency of seagrass canopy-induced trapping and retention of sestonic particles and root-uptake, results in the acquisition of nutrients released upon mineralization of particula...