摘要
利用开顶箱薰气室(Open-Top Chamber),设置正常大气CO2浓度(Ambient CO2)和高CO2浓度(Elevated CO2,700μmol·mol-1)2个水平和不施氮(NN,0 g N·m-2)、常氮(MN,5 g N·m-2)和高氮(HN,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(Calamagrostis angustifo-lia)生物量分配的影响.结果表明,CO2浓度升高对小叶章生物量的影响因生长期而异,对地上生物量的促进作用在拔节和抽穗期较大,对地下生物量的促进作用在生长后期增大.高CO2浓度使小叶章叶占地上生物量比例在生长初期增大,生长后期增幅逐渐降低.高CO2浓度提高了小叶章的光合速率,而叶作为主要的光合器官,为适应环境条件下变化,小叶章自身生理特性调整了光合器官的比例,以满足在新环境下自身生长发育的需求.
An experiment was carried out with treatments different in nitrogen supply （0, 5 and 15 g .m-a） and CO2 level （350 and 700 p^mol ~ mo1-1） on the OTCs （open top chamber） equipment to investigate the biomasss allocation of Calamagrostis angustiiolia ireshwater marsh m 3anjlang l＇lam, nesutts showed that for the aboveground biomass, the promotion of elevated CO2 was found to be more obvious during the jointing and heading biomass to Calamagros elevated C02 tis angustifolia stages under all the nitrogen treatments. While, the response of belowground was more obvious in the later growth stage. The Leaf biomass allocation of increased rapidly due to elevated CO2 concentration, while the increase amplitude reduced during the later stage. The photosynthesis of Calamagrostis angustifolia was promoted, and as the main organ, the leaf of Calamagrostis angustifolia adjusted its physiological structure for adapting environmental change.
出处
《哈尔滨师范大学自然科学学报》
CAS
2012年第4期71-74,共4页
Natural Science Journal of Harbin Normal University
基金
黑龙江省教育厅科学技术研究项目(12511165)
