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中文摘要：
选择三江平原沼泽湿地典型草甸植被小叶章（Calamagrostis angustifolia），在淹水和非淹水2个土壤水分条件下，分别以NH4N03水溶液的形式均匀撒入0,6，12，24g/（m^2·a）（以N元素量计），进行了野外培养实验．结果表明，小叶章的株高和地上部分生物量均随着氮输入的增多而增大，且土壤处于非淹水状态时差异达到显著水平；小叶章植株的分蘖能力则均表现为先增加后降低，在氮输入量为12g／（m^2·a）时最大，随后减小氮输入后，叶片的叶绿素含量与净光合速率表现出一致的变化趋势，土壤处于非淹水状态时随着氮输入的增加依次增大；而土壤淹水时则随着氮输入的增加先增大后减小；当氮输入量为24g／（m^2·a）时表现出了抑制作用．
英文摘要：
Under the condition of un-flooded and flooded soil moistures, using dissolved NH4NO3 water liquor type, casted evenly 0, 6, 12, 24 g/（m^2·a） （calculated as N element amount）, selecting Sanjiang Plain marsh wetland typical meadow, Calamagrostis angustifolia field cultivated experiment was carried out. The height and above-ground biomass of Calamagrostis angustifolia all increased with the increasing N-import, when the soil was at un-flooded state, the differences reached marked level. Its tiller ability all displayed increased firstly and decreased after, and the greatest at 12 g/（m^2·a） of N-import amount. After N-import the contents of chlorophyll and photosynthetic rates showed similar change trend. When the soil was at un-flooded state, it increased with the increasing of N-import, while at soil flooded state, it increased first and decreased after, when N-import amount at 24g/（m^2·a） showed inhibiting action.
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