https://scholars.lib.ntu.edu.tw/handle/123456789/435484
標題: | Water salinity effects on growth and nitrogen assimilation rate of mangrove (Kandelia candel) seedlings | 作者: | YO-JIN SHIAU | 關鍵字: | 15 N isotope | Ammonium | Mangrove | Nitrate | Salinity | Uptake | 公開日期: | 2016 | 出版社: | ELSEVIER SCIENCE BV | 卷: | 137 | 起(迄)頁: | 50 | 來源出版物: | Aquatic Botany | 摘要: | © 2016 Elsevier B.V. Mangrove is one of the dominant plants in tropical and sub-tropical estuarine ecosystems. The understanding of growth and nitrogen (N) assimilation rates of mangrove at different water salinities can be beneficial for evaluating the response of mangroves to increased anthropogenic N loading into these systems. We investigated the effect of salinity on growth and N assimilation of Kandelia candel (L) Druce under the phytotron conditions at alternating temperatures of 25 °C (day) and 20 °C (night) with 16-h light at ∼300 μmol photons m−2 s−1. The experiment included four salinity treatments (0, 8.8, 17.5 and 35 psu) and two N sources (NO3−and NH4+). With increasing salinity, mangrove shoot and root biomass decreased, but its hypocotyl biomass increased. Thus, the total biomass yield of mangrove remained unchanged in different salinity treatments. Nevertheless, N assimilation rate measured by the15N stable isotope technique was significantly reduced from about 2.2 mg N g−1biomass hr−1under control conditions (0 psu) to 0.9 mg N g−1biomass hr−1under 35 psu. Mangrove favored nitrate than ammonium at low salinity (0 psu), but preferred NH4+to NO3−at higher salinity (17.5 and 35 psu). |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/435484 | ISSN: | 03043770 | DOI: | 10.1016/j.aquabot.2016.11.008 28454735 |
顯示於: | 生物環境系統工程學系 |
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