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首页> 外文期刊>Applied and Environmental Microbiology >Nitrogen Fixation (Acetylene Reduction) Associated with Decaying Leaves of Pond Cypress (Taxodium distichum var. nutans) in a Natural and a Sewage-Enriched Cypress Dome
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Nitrogen Fixation (Acetylene Reduction) Associated with Decaying Leaves of Pond Cypress (Taxodium distichum var. nutans) in a Natural and a Sewage-Enriched Cypress Dome

机译：天然柏油和富含污水的柏柏穹顶中与腐烂的柏柏（Taxodium distichum var.nutans）叶片腐烂相关的固氮（减少乙炔）

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摘要

Surface litter from a natural and a sewage-enriched cypress dome in north-central Florida showed a pronounced seasonal pattern of nitrogenase (acetylene reduction) activity associated with seasonal leaf fall from deciduous trees in the domes. Samples of peat from cores indicated negligible nitrogenase activity below the surface layer. Integrating the monthly rates of nitrogen fixation (based on the theoretical molar ratio of 3:2 for C2H4/NH3) yielded 0.39 and 0.12 g of N/m2 per year fixed in the litter of the natural and sewage-enriched domes, respectively. The nitrogen fixed in the first 3 months after leaf fall in the natural dome represented about 14% of the nitrogen increment in the decomposing cypress leaves, but fixation contributed a negligible amount of nitrogen (<1%) to decomposing litter in the sewage-enriched dome.
机译：来自佛罗里达州中北部的一个天然且富含污水的柏树圆顶的表面凋落物显示出明显的季节性固氮酶（乙炔还原）活动的季节性模式，该活动与圆顶上落叶树的季节性落叶相关。来自核心的泥炭样品表明，在表层以下的固氮酶活性可忽略不计。综合每月固氮率（基于C2H4 / NH3的理论摩尔比为3：2），每年可固定固定在自然圆顶和污水丰富的圆顶垃圾中的N9 / m2分别为0.39和0.12 g。落叶后最初3个月固定在自然穹顶中的氮占腐烂的柏树叶子中氮增量的14％，但固定对分解的凋落物中的氮的贡献可忽略不计（<1％）。污水丰富的圆顶。

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