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首页> 外文期刊>Polar biology >Nitrogen Supply Effects On Leaf Dynamics And Nutrient Input Into The Soil Of Plant Species In A Sub-arctic Tundra Ecosystem
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Nitrogen Supply Effects On Leaf Dynamics And Nutrient Input Into The Soil Of Plant Species In A Sub-arctic Tundra Ecosystem

机译：氮的供应对亚北极苔原生态系统叶片动力学和植物物种土壤养分输入的影响

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Global warming will lead to increased nitrogen supply in tundra ecosystems. How increased N supply affected leaf production, leaf turnover and dead leaf N input into the soil of Empetrum nigrum and Andromeda polifolia (evergreens), Eriophorum vaginatum (graminoid) and Betula nana (deciduous) in a sub-arctic tundra in northern Sweden between 2003 and 2007 was experimentally investigated. There was considerable interspecific variation in the response of leaf production to N addition, varying from negative, no response to a positive response. Nitrogen addition effects on leaf turnover also showed considerable variation among species, varying from no effect to increased leaf turnover (up to 27% in Eriophorum). Nitrogen addition resulted in a four to fivefold increase in N content in the dead leaves of both evergreens and a 65% increase in Eriophorum. Surprisingly, there was no increase in Betula. The response of dead leaf P contents to N addition was rather species specific. There was no response in Empetrum, whereas there were significant increases in Andromeda (+214%) and Eriophorum (+32%), and a decrease of 47% in Betula. As an overall result of the changes in leaf production, leaf turnover and dead leaf N and P contents, nitrogen addition increased in all species except Betula the amount of N and, for Andromeda and Eriophorum the amount of P transferred to the soil due to leaf litter inputs. However, the way in which this was achieved differed substantially among species due to interspecific differences in the response of the component processes (leaf production, leaf turnover, dead leaf nutrient content).
机译：全球变暖将导致苔原生态系统的氮供应增加。氮供应如何影响2003年瑞典北部亚寒带苔藓上的叶片产量，叶片周转率和死叶片氮输入到Empetrum nigrum和Andromeda polifolia（常绿），Eriophorum阴道瘤（胶体）和Betula nana（落叶）的土壤中和2007年进行了实验研究。叶片生产对氮添加的响应存在相当大的种间差异，从阴性变化到无响应。氮添加对叶片周转的影响也显示出物种间的显着差异，从无影响到叶周转的增加（在鸢尾中高达27％）。氮的添加使两种常绿植物的枯叶中的N含量增加了4到5倍，而Eriophorum的含量增加了65％。令人惊讶的是，桦木没有增加。死叶P含量对N添加的响应是特定于物种的。 Empetrum没有反应，而仙女座（+ 214％）和and（+ 32％）显着增加，而桦木（Betula）则减少了47％。作为叶片产量，叶片更新和枯死叶片中N和P含量变化的总体结果，除桦木中所有物种的氮添加量都增加了，而对于仙女座和E，由于叶而转移到土壤中的P量增加了垃圾输入。但是，由于组成过程的种间差异（叶片产量，叶片周转率，枯死叶片养分含量），种间差异的实现方式差异很大。

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