小兴安岭4种原始红松林群落类型生长季土壤呼吸特征

被引:65
作者
陆彬 [1 ]
王淑华 [2 ]
毛子军 [1 ]
孙涛 [1 ]
贾桂梅 [1 ]
靳世波 [2 ]
孙鹏飞 [2 ]
程春香 [2 ]
机构
[1] 东北林业大学森林植物生态学教育部重点实验室
[2] 五营林业气象试验站
基金
黑龙江省自然科学基金;
关键词
土壤呼吸; 根呼吸; 凋落物呼吸; 微生物呼吸; 土壤温度; 原始红松林;
D O I
10.20103/j.stxb.2010.15.013
中图分类号
S714 [森林土壤学];
学科分类号
090301 [土壤学];
摘要
为阐明小兴安岭地带性植被原始红松林土壤呼吸各组分的碳排放速率及其对土壤水热变化的响应规律,采用挖壕法和红外气体分析法测定土壤表面CO2通量(Rs),确定4种原始红松林群落类型生长季的土壤总呼吸(Rt)中土壤微生物呼吸(Rh),根系呼吸(Rr)和凋落物呼吸(Rl)的贡献量动态变化及其影响因子。结果表明:生长季内,4种原始红松林群落类型的Rt、Rh、Rr具有明显的季节性变化,7-9月份较高,6月份和10月份较低。Rh对Rt的贡献量最高,平均在58.8%;Rr对Rt的贡献量次之,平均为26.5%;Rl对Rt的贡献量相对较小,平均为12.5%。生长季土壤呼吸速率与5cm深土壤温度相关性极显著(P<0.01)。Rr和Rh的Q10值分别为2.88和2.23。表明根呼吸对土壤温度的敏感性高于微生物呼吸。生长季平均土壤呼吸速率的依次为:椴树红松林(6.38μmol·m-·2s-1)>云冷杉红松林(6.32μmol·m-·2s-1)>枫桦红松林(5.95μmol·m-·2s-1)>蒙古栎红松林(2.86μmol·m-·2s-1)。4种原始叶红松林群落类型间的Rh和Rr也存在一定差异。
引用
收藏
页码:4065 / 4074
页数:10
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