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首页> 外文期刊>Plant and Soil >The resilience of nitrogen fixation in feather moss (Pleurozium schreberi)-cyanobacteria associations after a drying and rewetting cycle
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The resilience of nitrogen fixation in feather moss (Pleurozium schreberi)-cyanobacteria associations after a drying and rewetting cycle

机译：干燥和再润湿循环后，羽毛苔藓（Pleurozium schreberi）-蓝细菌协会中固氮的复原力

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Nitrogen (N-2) fixation in feather moss-cyanobacteria associations is a major source of N for boreal ecosystems. However, mosses experience significant shifts in their moisture status due to daily and yearly fluctuations in sunlight, temperature and precipitation. While the effects of drying and rewetting on nutrient leaching and photosynthesis in mosses have been studied, no attempt has been made to assess the consequences for N-2 fixation in feather mosses. We conducted an experiment in which we dried (3 day at 28 A degrees C; < 9 % of field moisture) and rewetted samples of the feather moss Pleurozium schreberi (Brid.) Mitt. that is colonized by N-2-fixing-cyanobacteria to assess the influence on N-2 fixation. Further, we tested how long it takes for N-2 fixation to recover from a drying-rewetting cycle. In addition, we assessed how N-2 fixation changes with incubation time with acetylene (2-65 h). A drying period of 3 days almost completely eliminated N-2 fixation (< 0.2 mu mol m(-2) h(-1)) in the moss. However, rates slowly recovered after rewetting, reaching N-2 fixation levels of moist (non-water stressed) moss 5 days after rewetting. Nitrogen fixation increased significantly with incubation time with acetylene (0 mu mol m(-2) h(-1) at 2 h vs. 26 mu mol m(-2) h(-1) at 65 h incubation). Although N-2 fixation recommenced upon rewetting, the recovery was slow. Thus, recurrent drying and rewetting cycles could reduce total N-2 fixation in moss-cyanobacteria associations over time, leading to reduced total N input to the system.
机译：羽毛苔藓-蓝细菌协会中的氮（N-2）固定是北方生态系统氮的主要来源。但是，由于日光，温度和降水的逐年和逐年波动，苔藓的水分状态发生了显着变化。虽然已经研究了干燥和再润湿对苔藓中养分浸出和光合作用的影响，但尚未尝试评估N-2固定在羽毛苔藓中的后果。我们进行了一个实验，在该实验中我们进行了干燥（在28 A的温度下进行3天; <9％的田间湿度）并重新润湿了羽毛苔白灵菇（Brid。）Mitt的样品。被N-2-固定蓝细菌定殖，以评估其对N-2固定的影响。此外，我们测试了N-2固定从干燥再润湿循环中恢复需要多长时间。此外，我们评估了乙炔（2-65 h）孵育时间后N-2固定如何变化。 3天的干燥时间几乎完全消除了苔藓中的N-2固定（<0.2μmol m（-2）h（-1））。然而，重新润湿后速率缓慢恢复，重新润湿后5天达到潮湿（非水分胁迫）苔藓的N-2固定水平。氮固定随着乙炔的孵育时间显着增加（在2 h时为0μmol m（-2）h（-1）与在65 h时为26μmol m（-2）h（-1））。尽管重新润湿后建议重新使用N-2固定剂，但恢复速度很慢。因此，随着时间的流逝，反复的干燥和再润湿循环可能会减少苔藓-蓝细菌缔合中的总N-2固定，从而导致向系统输入的总N减少。

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