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NH4NO3水溶液的形式均匀撒入0,6,12,24g/(m2·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/(m2·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/(m2·a)时表现出了抑制作用.
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.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2007年第4期513-517,共5页
China Environmental Science
基金
国家自然科学基金资助项目(40471124
40431001)
中国科学院重要方向性项目(kzcx2-yw-309)
关键词
湿地植物
氮输入
土壤水分
生长
光合速率
wetland plants
N import
soil moisture
grow
photosynthetic rate
作者简介
刘德燕（1981-），女，山东青州人，中国科学院东北地理与农业生态研究所博士研究生，研究方向为环境变化与物质循环．发表论文2篇．
责任作者．研究员．songcc@neigae．ac．cn
