Zhao Guang-Ying, Liu Jing-Shuang, Wang Yang
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
Ying Yong Sheng Tai Xue Bao. 2011 Jun;22(6):1653-8.
By using open top chamber, an experiment with two levels of atmospheric CO2 concentration (350 and 700 micromol x mol(-1)) and three levels of nitrogen supply (0, 5, and 15 g N x 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 x 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.
通过使用开顶式气室，进行了一项实验，设置了两个大气CO₂浓度水平（350和700微摩尔×摩尔⁻¹）以及三个氮供应水平（0、5和15克氮×米⁻²），以研究大气CO₂浓度升高和氮供应对三江平原淡水沼泽小叶章生长的影响。在大气CO₂浓度升高的情况下，小叶章的物候期提前。拔节期提前了1 - 2天，成熟期提前了3天。大气CO₂浓度升高促进了小叶章的分蘖，在0、5和15克×米⁻²氮供应水平下，分蘖数的增加分别为8.2%（P < 0.05）、8.4%（P < 0.05）和5.5%（P > 0.05）。大气CO₂浓度升高还促进了拔节期和抽穗期的地上生物量，增加幅度分别为12.4%和20.9%（P < 0.05），并增加了后期生长阶段的地下生物量，在乳熟期和成熟期的增加幅度分别为20.5%和20.9%（P < 0.05）。小叶章生物量对大气CO₂浓度升高的响应取决于氮供应水平。在充足的氮供应下，大气CO₂浓度升高对小叶章生物量的促进作用更高。
