[ACG56-P03] Examination of potential effects of nitrogen supply on nitrogen content and decomposition characteristics of eelgrass (Zostera marina)
Keywords:seagrass meadow, eelgrass (Zostera marina), portable nitrogen measurement device
In this study, we focused on the eelgrass (Zostera marina) widely distributed in the coastal area of Japan, and examined the followings, potential effects of the nitrogen supply in the coastal area on the function as “blue carbon”.
1) Nitrogen content of eelgrass leaves at several locations with potentially different nitrogen supply
The relationship between nitrogen content in sediments and nutrients in the water column in the eelgrass beds were measured along the coast in the temperate zone and in the subarctic zone and compared with the nitrogen content of the eelgrass leaf.
2) Possibility of measuring nitrogen content in eelgrass leaf using portable nitrogen meter
The measured values of multiple portable nitrogen meters for land herbs were compared with the chlorophyll content and actual nitrogen content of the eelgrass Z. marina. Conditions that enable us to effectively estimate the nitrogen content of eelgrass are discussed.
3) Relationship between nitrogen content and the amount of structural and repellent substances in the eelgrass leaves
The amount of structural substances and repellent substances of eelgrass plants were evaluated using chemical (KOH, NaClO2, and NaOH) treatments and Folin-ciocalteu method, respectively, and compared with the nitrogen content in each part of the leave.