| Autor: |
Tanu, Ferdouse Zaman, Yasuhiro Asakura, Satoshi Takahashi, Ko Hinokidani, Hakim, Azizul, Yasuhiro Nakanishi |
| Předmět: |
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| Zdroj: |
EnvironmentAsia; Jan2024, Vol. 17 Issue 1, p29-40, 12p |
| Abstrakt: |
Complex ecological setups of mangroves under various environmental factors and landuse form unique ecosystems in tropical and subtropical coasts around the world. This study aimed to investigate the imprints of different levels of land-use ratio on reactive nitrogen (N), reactive phosphorus (P) and stable N isotope ratio (δ15N) of mangrove leaves on Ishigaki Island (Is.), Japan. Results showed that dissolved inorganic N (DIN), dissolved organic N (DON), soluble reactive phosphorous (SRP) of surface water, and mangrove leaf δ15N are significantly influenced by the land-use ratio, mainly the forest area of the watersheds. The mangrove leaf δ15N values ranging from 0 to 13‰ indicated different level of human interaction with the ecosystems after land-derived N absorption by mangroves. The circumstance was illustrated through the significant positive correlation of mangrove leaf δ15N with surface water DIN, and the negative correlation with the forest area ratio (%). However, a major contribution of DON to the total dissolved N (TDN) of surface water reflected that the concentrations of both DIN and DON might be regulated by the respective land-use in the watersheds, further controlling the mangrove leaf δ15N values. The findings are important for taking relative measures for conservation and management of the mangroves on Ishigaki Island, Japan. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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