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首页> 美国卫生研究院文献>Annals of Botany >Sensitivity of the xerophytic moss Syntrichia caninervis to prolonged simulated nitrogen deposition
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Sensitivity of the xerophytic moss Syntrichia caninervis to prolonged simulated nitrogen deposition

机译：旱生苔藓Syntrichia caninervis对长时间模拟氮沉降的敏感性

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>Background and Aims Biological soil crusts, comprising assemblages of cyanobacteria, fungi, lichens and mosses, are common in dryland areas and are important elements in these ecosystems. Increasing N deposition has led to great changes in community structure and function in desert ecosystems worldwide. However, it is unclear how moss crusts respond to increased atmospheric N deposition, especially in terms of growth and physiological parameters. The aim of this study was to understand how Syntrichia caninervis, a dominant species in moss crusts in many northern hemisphere desert ecosystems, responds to added N.>Methods The population and shoot growth, and physiological responses of S. caninervis to six different doses of simulated N deposition (0, 0·3, 0·5, 1·0, 1·5 and 3·0 g N m–2 year–1) were studied over a 3 year period.>Key Results Low amounts of added N increased shoot length and leaf size, whereas high doses reduced almost all growth parameters. Moss shoot density increased, but population biomass decreased with high N. Low N augmented chlorophyll b, total chlorophyll content and soluble protein concentrations, but not chlorophyll a or chlorophyll fluorescence. High N was detrimental to all these indices. Soluble sugar concentration declined with increased N, but proline concentration was not affected significantly. Antioxidant enzyme activities generally decreased with low N additions and increased with high doses of simulated N deposition.>Conclusions Low amounts of added N (0–0·5 g N m–2 year–1) may enhance moss growth and vitality, while higher amounts have detrimental effects.
机译：>背景和目的：生物土壤结皮，包括蓝细菌，真菌，地衣和苔藓，在干旱地区很常见，并且是这些生态系统中的重要元素。越来越多的氮沉积导致世界范围内沙漠生态系统的群落结构和功能发生了巨大变化。然而，目前尚不清楚苔藓结皮如何应对增加的大气氮沉积，特别是在生长和生理参数方面。本研究的目的是了解北半球许多沙漠生态系统中苔藓结壳中的优势种犬齿综合症如何对添加的氮作出反应。>方法 caninervis对六种不同剂量的模拟N沉积（0、0·3、0·5、1·0、1·5和3·0μgN m –2 year –1 < / sup>）进行了为期3年的研究。>主要结果：少量添加的氮会增加茎长和叶片大小，而高剂量会降低几乎所有的生长参数。苔藓芽密度增加，但种群生物量随高氮而降低。低氮增加叶绿素b，总叶绿素含量和可溶性蛋白浓度，但不增加叶绿素a或叶绿素荧光。高氮不利于所有这些指数。可溶性糖浓度随氮含量的增加而下降，但脯氨酸浓度并未受到明显影响。添加低氮会降低抗氧化酶的活性，而随着高剂量模拟氮的沉积会增加抗氧化酶的活性。>结论添加低氮（0–0·5 g N m –2 year –1 ）可能会增强苔藓的生长和活力，而数量增加则会产生不利影响。

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