摘要
采用电缆加热水浴升温的方法，研究了土壤温度升高对湿草甸小叶章碳、氮累积的影响，对比分析了淹水和非淹水条件下土温升高的相对影响程度。经过一个生长季，升温处理小叶章地上和地下部位生物量分别平均较对照增加６７．２４％和４８．８３％，而升温与淹水的交互作用下二者则分别平均增加４５．２１％ 和７８．１３％。土温升高显著提高了小叶章植株的碳、氮累积量，而降低了其地上和地下部位的Ｃ／Ｎ，升温处理植株碳、氮累积量分别较对照平均增加４８．９０％和１０４．２０％，而地上和地下部位Ｃ／Ｎ 则分别平均下降８．４４％和５．２６％，升温与淹水的交互作用显著促进了地上部位的碳、氮累积。结果表明，１～３℃的土温升高显著促进了小叶章的生物量及碳、氮累积，并将对湿地系统的碳固定过程造成影响。
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 car bon sequestration in freshwater marsh ecosystems.
出处
《草业学报》
CSCD
北大核心
2010年第1期59-66,共8页
Acta Prataculturae Sinica
基金
中国科学院知识创新工程重要方向资助项目(KZCX2-YW-309)
国家重点基础研究发展计划项目(2004CB418507)资助
关键词
土温升高
小叶章
碳
氮含量
soil warming
Calamagrostis angustifolia
carbon and nitrogen contents
