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首页> 外文期刊>Marine ecology progress series >Changes in growth, internode distance and nutrient concentrations of the seagrass Halophila ovalis with exposure to sediment sulphide
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Changes in growth, internode distance and nutrient concentrations of the seagrass Halophila ovalis with exposure to sediment sulphide

机译：暴露于硫化物沉积下的椭圆形海草嗜盐菌的生长，节间距离和养分浓度的变化

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摘要

Sulphide concentrations in estuarine sediments are likely to increase with increased organic matter fluxes (eutrophication) and increased temperatures (global warming). The short-term effects of sulphide on the growth, nutrition and morphology of the seagrass Halophila ovalis (R.Br.) Hook. f. were investigated in situ. Sediments within a H. ovalis meadow were enriched with Na_2S equivalent to 0, 1.1 and 4.2 g m~(-2). Sulphide diffusion tubes were estimated to increase sulphide concentrations by 1 to 4 mmol l~(-1), concentrations typical of elevated sulphide measured in natural systems. Biomass, internode distance and growth rate (mg apex~(-1) day~(-1)) were determined, and plant material was analysed for soluble carbohydrate, carbon, nitrogen and phosphorus. Sulphide exposure caused significant reduction in growth (63 %), average leaf weight (30 %) and internode distance (15%). Above-ground tissue phosphorus concentration and internode distance were significant predictors of growth (R~2 = 0.63, p < 0.01). These results demonstrate the plasticity of H. ovalis in response to a short-term sulphide pulse, and may have implications for recovery from transient sulphide stress.
机译：随着有机质通量（富营养化）和温度升高（全球变暖）的增加，河口沉积物中的硫化物浓度可能会增加。硫化物对海草椭圆形嗜盐菌（R.Br.）钩的生长，营养和形态的短期影响。 F。进行了现场调查。椭圆形草草甸的沉积物中富含Na_2S，相当于0、1.1和4.2 g m〜（-2）。据估计，硫化物扩散管可使硫化物浓度增加1-4 mmol l（-1），这是自然系统中测得的典型硫化物升高浓度。测定生物量，节间距离和生长速率（mg顶点〜（-1）天〜（-1）），并分析植物材料中的可溶性碳水化合物，碳，氮和磷。暴露于硫化物可显着降低生长（63％），平均叶片重量（30％）和节间距离（15％）。地上组织中的磷浓度和节间距离是生长的重要预测因子（R〜2 = 0.63，p <0.01）。这些结果表明卵形H.可塑性响应短期硫化物脉冲，并可能对瞬时硫化物应力的恢复有影响。

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