期刊
FOREST ECOLOGY AND MANAGEMENT
卷 491, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.foreco.2021.119143
关键词
Coarse woody debris; Decay; Carbon; Decomposition; Bark; Dead wood; Lignin
类别
资金
- Russian Foundation for Basic Research [19-04-01282]
By studying a 66-year decomposition process in an old-growth mixed boreal forest, researchers found that the dynamics of carbon, nitrogen, cellulose, and lignin in downed logs were influenced by the availability of nitrogen, which positively impacted wood bulk density loss and cellulose degradation. The study highlights the importance of considering tree species specific traits in decomposition studies in old-growth boreal forests.
Quantifying forest carbon (C) and nitrogen (N) turnover rates requires better understanding of the mechanisms of decomposition of coarse woody debris (CWD). We examined the dynamics of bulk density, C, N, cellulose and lignin in downed logs, taking into account initial interspecific trait differences in bark and wood, in a 66-yearlong decomposition chronosequence in an old-growth mixed boreal forest. Wood and bark density decreased with increasing decay class and time since tree death. The C concentration per mass did not change or slightly decreased. Nitrogen increased in wood faster than in bark. In aspen wood, it increased two times more intensively than in wood of conifers. The C/N ratio and the cellulose content decreased, whereas the lignin content increased, decreased or remained stable in wood depending on tree species and calculation basis. Spruce wood was characterized by the greatest cellulose degradation rates. The N availability positively influenced wood bulk density loss and cellulose degradation in wood of all tree species, as well as the C loss in conifer bark. The total C amount in bark and wood of individual downed logs decreased. The total N amount decreased in bark and increased in wood with different rates depending on tree species identity. The results indicate the importance of accounting for the CWD tissue tree species specific traits in decomposition studies. In old-growth boreal forests, downed logs contribute significantly to long-term C and N sequestration.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据