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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nutrient dynamics in two seagrass species, Posidonia coriacea and Zostera tasmanica, on Success Bank, Western Australia
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Nutrient dynamics in two seagrass species, Posidonia coriacea and Zostera tasmanica, on Success Bank, Western Australia

机译：西澳大利亚州成功银行的两种海草物种Posidonia coriacea和Zostera tasmanica的营养动态

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摘要

Nutrient concentrations and seasonal differences in atomic ratios (N:P) in plant tissue of Posidonia coriacea Kuo and Cambridge and Zostera tasmanica Aschers (formerly Heterozostera tasmanica (Syst Bot 27 (2002) 468) were measured from multiple locations on Success Bank, southwestern Australia, and used to infer nutritional constraints on seagrass vegetative growth, particularly by phosphorus. Posidonia plant tissue at the west site had higher nitrogen than the east site in both summer and winter. Nitrogen concentrations increased in winter, particularly in sheath tissue, but there was little change in root nitrogen concentrations between sites or seasons. Nitrogen concentrations of leaf tissue were all less than median seagrass values reported by Duarte (Mar Ecol Prog Ser 67 (1990) 201). The seasonality in nutrient concentrations in plant tissues suggests greater nutritional constraints in summer, during periods of high growth. Vegetative growth of Posidonia coriacea was more nutrient limited than that of Zostera tasmanica. Translocation of nutrients along rhizomes to the apex may ensure that growing points are not nutrient limited and that growth can be maintained, and was more apparent in Z. tasmanica than P. coriacea. Sexual reproduction placed large demands on P. coriacea through the high investment of nutrients into fruit, resulting in reduced nutritional constraints on successful seedling recruitment by initially providing seedlings with nutrients.
机译：在澳大利亚西南部成功银行的多个地点测量了波塞冬病原菌，剑桥和塔斯曼尼卡·阿斯彻斯（以前称为Heterozostera tasmanica（Syst Bot 27（2002）468））植物组织中的营养浓度和原子比的季节性差异（N：P）。 ，并且可以用来推断营养对海草营养生长的限制，尤其是磷的限制；夏季和冬季，西部站点的波西多尼亚植物组织中的氮含量均高于东部站点；冬季，尤其是鞘组织中的氮含量有所增加。站点或季节之间的根系氮浓度变化不大，叶片组织的氮浓度均小于Duarte报告的海草中位值（Mar Ecol Prog Ser 67（1990）201）。在夏季，处于高生长时期，Corsiacea的营养生长更加营养比塔斯马尼亚的Zostera有限。营养物质沿根状茎向根尖的转移可以确保生长点不受营养物质的限制，并且可以保持生长，并且在塔斯马尼亚Z.中比than草更明显。有性繁殖通过对果树进行大量养分投入而对桔梗假单胞菌提出了很高的要求，通过最初为幼苗提供养分，从而减少了对成功招募幼苗的营养限制。

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