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Interactive effects of temperature and nutrients on mangrove seedling growth and implications for establishment

机译:温度和养分对红树林幼苗生长的相互作用及其对建立的影响

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The establishment and wellbeing of seedlings governs the spread and survival of mangrove forests. Eutrophication and global warming are major challenges endangering mangrove ecosystem integrity. How these stressors affect seedling growth is not well understood. In a mesocosm experiment we grew mangrove seedlings in temperature-controlled chambers and investigated single and combined effects of temperature (23 and 33 degrees C), organic matter and dissolved nutrients on seedling trait morphology. Seedling survival was lowest in organic matter treatments. Combined effects of temperature and nutrients caused significant differences in root morphology with fewer but longer and thicker 3rd order roots, fewer 2nd and no 1st order roots in nutrient-enriched (23 degrees C) compared to non-enriched treatments (33 degrees C). Our results indicate these seedlings are less resilient to withstand their dynamic environment, in which they must settle and establish, due to lower root complexity. Mangrove ecosystems are negatively affected by global and local stresses; if new seedlings, which support forest recovery, are also affected then this amplifies stresses.
机译:幼苗的生长和健康决定着红树林的扩散和生存。富营养化和全球变暖是危害红树林生态系统完整性的主要挑战。这些应激源如何影响幼苗的生长尚不清楚。在中观试验中,我们在温度受控的室内种植红树林幼苗,并研究了温度(23和33摄氏度),有机质和可溶性营养素对幼苗性状形态的单一和综合影响。在有机物处理中,幼苗存活率最低。温度和养分的综合作用导致了根系形态的显着差异,与未强化处理(33摄氏度)相比,富含养分(23摄氏度)的三阶根更少但更长,更粗,二阶和无一阶根更少。我们的结果表明,由于较低的根部复杂性,这些幼苗在承受其动态环境的过程中抵抗力较弱,因此必须在其中定居和建立。红树林生态系统受到全球和局部压力的不利影响;如果支持森林恢复的新树苗也受到影响,则会加剧压力。

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