Plant nitrogen uptake drives responses of productivity to nitrogen and water addition in a grassland.
Plant nitrogen uptake drives responses of productivity to nitrogen and water addition in a grassland.
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植物氮吸收驱动生产力对草原氮和水添加的响应
DOI：
10.1038/srep04817
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发表时间：
2014-04-28
影响因子：
4.6
通讯作者：
Han XG
中科院分区：
文献类型：
--
作者：
Lü XT;Dijkstra FA;Kong DL;Wang ZW;Han XG
大气氮沉降的增加和降水模式的改变对半干旱草原生态系统功能产生了深远的影响。这两个因素之间的相互作用在很大程度上仍然是未知的。在北方半干旱草地上进行了氮素和水分添加的田间试验。我们研究了在两个不同的水文生长季节的地上净初级生产力（ANPP）和植物氮的利用。氮添加对ANPP没有影响，这可能是由于增加植物氮吸收和降低植物氮利用效率（NUE）之间的抵消。水分的增加显著提高了植物的ANPP，这在很大程度上是由于提高了植物地上部氮的吸收。氮和水的添加量显着交互作用，影响ANPP，植物N吸收和N浓度在社区水平。我们的观察强调了植物氮素吸收和利用的重要作用，在介导的影响，氮和水除了对ANPP。
Increased atmospheric nitrogen (N) deposition and altered precipitation regimes have profound impacts on ecosystem functioning in semiarid grasslands. The interactions between those two factors remain largely unknown. A field experiment with N and water additions was conducted in a semiarid grassland in northern China. We examined the responses of aboveground net primary production (ANPP) and plant N use during two contrasting hydrological growing seasons. Nitrogen addition had no impact on ANPP, which may be accounted for by the offset between enhanced plant N uptake and decreased plant nitrogen use efficiency (NUE). Water addition significantly enhanced ANPP, which was largely due to enhanced plant aboveground N uptake. Nitrogen and water additions significantly interacted to affect ANPP, plant N uptake and N concentrations at the community level. Our observations highlight the important role of plant N uptake and use in mediating the effects of N and water addition on ANPP.
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影响因子：
5.2
作者：
Li, Ang;Guo, Dali;Liu, Hongyan
通讯作者：
Liu, Hongyan
影响因子：
56.9
作者：
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Schlesinger, WH
影响因子：
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Rewald, Boris;Ephrath, Jhonathan E.;Rachmilevitch, Shimon
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Rachmilevitch, Shimon
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通讯作者：
Oren, Ram
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作者：
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通讯作者：
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