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首页> 外文期刊>Plant and Soil >Response of leaf, sheath and stem nutrient resorption to 7 years of N addition in freshwater wetland of Northeast China
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Response of leaf, sheath and stem nutrient resorption to 7 years of N addition in freshwater wetland of Northeast China

机译：东北淡水湿地叶片，茎鞘和茎秆养分吸收对氮素添加7年的响应

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Increased N availability induced by agricultural fertilization applications and atmospheric N deposition may affect plant nutrient resorption in temperate wetlands. However, the relationship between nutrient resorption and N availability is still unclear, and most studies have focused on leaf nutrient resorption only. The aim of our study was to examine the response of leaf and non-leaf organ nutrient resorption to N enrichment in a temperate freshwater wetland. We conducted a 7-year N addition experiment to investigate the effects of increased N loading on leaf, sheath and stem nutrient (N and P) resorption of two dominant species (Deyeuxia angustifolia and Glyceria spiculosa) in a freshwater marsh in the Sanjiang Plain, Northeast China. Our results showed that, for both leaf and non-leaf organs (sheath and stem), N addition decreased N resorption proficiency and hence increased litter N concentration. Moreover, the magnitude of N addition effect on N resorption proficiency varied with fertilization rates for D. angustifolia sheaths and stems, and G. spiculosa leaves. However, increased N loading produced inconsistent impacts on N and P resorption efficiencies and P resorption proficiency, and the effects only varied with species and plant organs. In addition, N enrichment increased litter mass and altered litter allocation among leaf, sheath and stem. Our results highlight that leaf and non-leaf organs respond differentially to N addition regarding N and P resorption efficiencies and P resorption proficiency, and also suggest that N enrichment in temperate freshwater wetlands would alter plant internal nutrient cycles and increase litter quality and quantity, and thus substantially influence ecosystem carbon and nutrient cycles.
机译：农业施肥和大气氮沉降引起的氮素利用率增加，可能会影响温带湿地植物的养分吸收。但是，养分吸收与氮素利用率之间的关系仍然不清楚，并且大多数研究仅集中于叶片养分吸收。我们研究的目的是研究温带淡水湿地中叶片和非叶器官养分吸收对氮富集的响应。我们进行了为期7年的氮素添加实验，研究了氮素含量增加对三江平原淡水沼泽中两种优势种（小叶小眼藻和绞股蓝）的叶片，鞘和茎营养素（氮和磷）吸收的影响，中国东北。我们的结果表明，无论是叶器官还是非叶器官（鞘和茎），氮的添加都会降低氮的吸收能力，从而增加凋落物的氮浓度。此外，氮的添加量对氮吸收能力的影响程度会随杜鹃花鞘和茎和G. spiculosa叶施肥速率的变化而变化。然而，增加的氮负荷对氮和磷的吸收效率和磷的吸收能力产生不一致的影响，并且该影响仅随物种和植物器官而变化。此外，氮的富集增加了凋落物质量并改变了叶子，鞘和茎之间的凋落物分配。我们的结果强调，在氮和磷的吸收效率和磷的吸收效率方面，叶和非叶器官对氮的添加反应不同，并且还表明温带淡水湿地中氮的富集将改变植物内部养分循环并增加凋落物的质量和数量，并且因此大大影响了生态系统的碳和养分循环。

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