Effects of experimental warming on the carbon and nitrogen contents of Calamagrostis angustifolia

Abstract

Abstract: To determine the effects of warming on carbon and nitrogen contents of Calamagrostis angustifolia, a warming experiment was conducted under flooded and non-flooded conditions in a typical C. angustifolia meadow wetland of Sanjiang Plain, Northeast China. Warming cables were used to simulate soil warming. During the growing season, aboveground and belowground biomass of C. angustifolia increased by 67.24% and 48.83% under warming treatment, and by 45.21% and 78.13%, respectively under the interaction of warming and flooding. Experimental warming significantly enhanced carbon and nitrogen accumulations of C. angustifolia, and reduced C/N of the aboveground and belowground parts. Under warming treatment, carbon and nitrogen accumulation increased by 48.90% and 104.2%, while C/N of the aboveground and belowground parts decreased by 8.44% and 5.26%, respectively. Moreover, carbon and nitrogen accumulation of aboveground parts showed a significant increase under the interaction of warming and flooding. 1-3℃ soil warming significantly increased the biomass and carbon and nitrogen accumulation of C. angustifolia, thus affecting the carbon sequestration in freshwater marsh ecosystems.

CLC Number:

DOU Jing-xin, LIU Jing-shuang, WANG Yang, ZHAO Guang-ying. Effects of experimental warming on the carbon and nitrogen contents of Calamagrostis angustifolia[J]. Acta Prataculturae Sinica, 2010, 19(1): 59-66.

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