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草业学报  2010 

土温升高对湿草甸小叶章植株碳、氮含量的影响

, PP. 59-66

Keywords: 土温升高,小叶章,碳、氮含量

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Abstract:

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。

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