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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Comparison of Nitrogen Fixation Activity in Tall and Short Spartina alterniflora Salt Marsh Soils
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Comparison of Nitrogen Fixation Activity in Tall and Short Spartina alterniflora Salt Marsh Soils

机译：高和短互花米草盐沼土壤固氮活性的比较

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摘要

A comparison of the N2 fixers in the tall Spartina alterniflora and short S. alterniflora marsh soils was investigated. Zero-order kinetics and first-order kinetics of acetylene reduction were used to describe the activity of the N2 fixers in marsh soil slurries. It was found that the Vmax values were approximately 10 times greater for the N2 fixers in the tall Spartina than in the short Spartina marsh when raffinose was used as the energy source. In addition, the (Ks + Sn) values were approximately 4 to 15 times lower for the N2 fixers in the tall Spartina than in short Spartina marsh. First-order kinetics of nitrogen fixation for several substrates indicate that the N2 fixers in the tall Spartina marsh were two to seven times more active than those in the short Spartina marsh. Ammonium chloride (25 μg/ml) did not inhibit nitrogen fixation in the tall Spartina marsh, but there was a 50% inhibition in nitrogen fixation in the short Spartina marsh. On the other hand, sodium nitrate inhibited nitrogen fixation almost 100% at 25 μg/ml in both soil environments. Amino nitrogen (25 to 100 μg/ml) had little or no effect on nitrogen fixation. The results indicate that the N2 fixers in the tall Spartina marsh were physiologically more responsive to nutrient addition than those in the short Spartina marsh. This difference in the two populations may be related to the difference in daily tidal influence in the respective areas and thus provide another explanation for the enhanced S. alterniflora production in the creek bank soil system.
机译：比较了互花米草和短互花米草沼泽土壤中的N2固定剂。乙炔还原的零阶动力学和一阶动力学用于描述沼泽土壤浆液中固氮剂的活性。研究发现，当使用棉子糖作为能源时，高Spartina中的N2固定剂的Vmax值比短Spartina沼泽中的N2固定剂大约高10倍。此外，高斯巴蒂纳州的N2固定剂的（Ks + Sn）值比斯巴蒂纳州短沼泽中的N2固定剂低约4至15倍。几种基质固氮的一级动力学表明，高斯巴蒂纳沼泽中的N2固定剂的活性比短斯巴蒂纳沼泽中的固氮活性高2至7倍。氯化铵（25μg/ ml）不会抑制高斯巴蒂纳沼泽中的固氮，但对短斯巴蒂纳沼泽中的固氮有50％的抑制作用。另一方面，在两种土壤环境中，硝酸钠均以25μg/ ml的浓度抑制了近100％的固氮。氨基氮（25至100μg/ ml）对固氮几乎没有影响。结果表明，在较高的Spartina沼泽中，N2固定剂比在较短的Spartina沼泽中对养分的生理响应更高。两个种群的这种差异可能与各个地区的每日潮汐影响的差异有关，从而为增强的 S提供了另一种解释。河岸土壤系统中的互生菌互作。

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