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中文摘要：
以沼泽湿地典型草甸植被小叶章（Calamagrostis angustifolia）为研究对象，在三江平原进行了野外培养实验，探讨了4个不同氮素输入水平（0（NO）、6（N6）、12（N12）、24（N24）g·m^-2·a^-1）下沼泽湿地植物生长与光合特性的响应特征，并从光合固“碳”的角度分析了小叶章沼泽湿地的固“碳”潜势结果表明，外源氮输入明显促进了小叶章的株高、叶面积及植株数，显著增加了碳的生物量积累，到植物生长季结束，N6、N12和N24三个施氮水平下，小叶章地上部分生物量分别比对照增加了58.79％、133.11％和190.55％，同时，小叶章叶片全氮含量、叶绿素、可溶性蛋白和游离氨基酸含量也显著增加，净光合速率明显提高，分别比对照增加了20.70％、26.69％和53.54％,从光合固“碳”的角度来看，外源氮输入能够促使沼泽湿地植物通过光合作用固定更多CO_2。
英文摘要：
To explore the growth, photosynthetic characteristics and carbon sequestration potential of wetland plants exposed to increased supply of nitrogen （N） in freshwater marshes of Sanjiang Plain, we supplied dissolved NH_4 NO_3 （0（NO） ,6 （N6）, 12（N12） ,24（N24）g·m^-2·a^-1） to the seedlings of Calamagrostis angustifolia in a field cultivation experiment. The results showed that the height, leaf area and plant number （per pot） increased markedly with N levels. As a result, their above-ground dry weight increased significantly, N6 ,N12 and N24 were about 58.79% ,133.11% and 190.55% higher than the control at the end of the growing season. Meanwhile, the foliar N, chlorophyll, soluble protein and free amino acids contents also increased, and the net photosynthetic rates in the N treatments （N6 ,N12 and N24） were 20.70% ,26.69% and 53.54% higher than in the control. These results indicated that the increase of N supply is accompanied by a greater capacity for carbon assimilation. Thus, we conclude that exogenous nitrogen import would enhance more CO_2 sequestration in regard to sequestering carbon through photosynthesis in freshwater marshes.
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