单 位：
中国科学院东北地理与农业生态研究所;中国科学院山西煤炭化学研究所
关键词：
三江平原湿地;小叶章;大气CO2浓度升高;氮添加;物候期;生物量
摘 要：
利用开顶箱薰气室,设置正常大气CO2浓度(350μmol.mol-1)、高CO2浓度(700μmol.mol-1)2个CO2水平和不施氮(0 g N.m-2)、中氮(5 g N.m-2)和高氮(15 g N.m-2)3个氮素水平,研究CO2浓度升高和氮肥施用对三江平原草甸小叶章生长的影响.结果表明:随着CO2浓度升高,小叶章物候期提前,其中抽穗期提前1~2 d,成熟期提前3 d;不施氮、中氮和高氮水平下,CO2浓度升高使小叶章的分蘖分别增加8.2%(P<0.05)、8.4%(P<0.05)和5.5%(P>0.05);在小叶章生长初期,CO2浓度升高对其生物量的增加有促进作用,拔节期和抽穗期小叶章地上生物量分别增加12.4%和20.9%(P<0.05);生长后期则对小叶章地下生物量的促进作用增大,腊熟期和成熟期的地下生物量分别增加20.5%和20.9%(P<0.05).小叶章生物量对高浓度CO2的响应与供氮水平有关,供氮充足条件下,高浓度CO2对生物量的促进效应更大.
译 名：
Effects of elevated atmospheric CO_2 concentration and nitrogen addition on the growth of Calamagrostis angustifolia in Sanjiang Plain freshwater marsh
作 者：
ZHAO Guang-ying1,2,LIU Jing-shuang1,WANG Yang1(1Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,China;2Department of Geography Science,Harbin Normal University,Harbin 150025,China)
关键词：
Sanjiang Plain freshwater marsh;Calamagrostis angustifolia;elevated atmospheric CO2 concentration;nitrogen addition;phenophase;biomass
摘 要：
By using open top chamber,an experiment with two levels of atmospheric CO2 concentration(350 and 700 μmol·mol-1) and three levels of nitrogen supply(0,5,and 15 g N·m-2) was conducted to investigate the effects of elevated atmospheric CO2 and nitrogen supply on the growth of Calamagrostis angustifolia in the freshwater marsh of Sanjiang Plain.Under elevated atmospheric CO2 concentration,the phenophase of C.angustifolia advanced.Jointing stage was advanced by 1-2 d,and maturity stage was advanced by 3 d.Elevated atmospheric CO2 promoted the tillering of C.angustifolia,with the increment of tiller number under 0,5,and 15 g·m-2 of nitrogen supply being 8.2%(P<0.05),8.4%(P<0.05),and 5.5%(P>0.05),respectively.Elevated atmospheric CO2 also promoted the aboveground biomass at jointing and heading stages,the increment being 12.4% and 20.9%(P<0.05),respectively,and increased the belowground biomass at later growth stages,with the increment at dough stage and maturity stage being 20.5% and 20.9%(P<0.05),respectively.The responses of C.angustifolia biomass to elevated atmospheric CO2 concentration depended on nitrogen supply level.Under sufficient nitrogen supply,the promotion effect of elevated atmospheric CO2 concentration on the biomass of C.angustifolia was higher.
