林伟盛;杨智杰;郭剑芬;刘小飞;熊丽;吴君君;陈朝琪;杨玉盛;

• 1:湿润亚热带山地生态国家重点实验室培育基地福建师范大学地理科学学院

摘要(Abstract)：

采用IRGA法(所用仪器为LI-8100)对福建三明米槠天然更新次生林皆伐火烧后初期土壤呼吸日动态进行研究.结果表明:皆伐火烧后土壤呼吸速率日变化趋势呈单峰型,呼吸速率在11:00～13:00之间达到最大值,而在3:00～7:00达到最小值.火烧地土壤日平均呼吸速率(5.59μmol.m-2.s-1)显著高于对照地(2.27μmol.m-2.s-1)和皆伐后保留采伐剩余物地(2.30μmol.m-2.s-1).皆伐和火烧后土壤呼吸速率日变化幅度增大,尤以火烧地的最为明显(达134.6%),分别比皆伐样地(88.0%)及对照地(53.3%)高54.6%和81.3%.不同处理方式土壤呼吸与温度(5 cm土壤温度、气温)、土壤含水量的关系采用双因素模型(R=aebTWc)拟合结果优于仅考虑温度或土壤含水量的单因素模型.火烧地Q10值明显高于对照地和皆伐地.

关键词(KeyWords)： 米槠;天然更新次生林;皆伐;火烧;土壤呼吸;温度;土壤含水量

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点资助项目(31130013)

作者(Authors): 林伟盛;杨智杰;郭剑芬;刘小飞;熊丽;吴君君;陈朝琪;杨玉盛;

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