本文由宁波市林业局项目2013L08和浙江省森林生态系统碳循环与固碳减排重点实验室开放项目FCLAB2015008资助 This work was supported by the Project of Ningbo Forestry Bureau,China 2013L08 and the Open Project of Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration,China FCLAB2015008.