Changes in water-soluble nitrogen and organic carbon in the post-fire litter layer of Dahurian larch forests
Changes in water-soluble nitrogen and organic carbon in the post-fire litter layer of Dahurian larch forests
复制标题
达胡里落叶松林火后凋落物层水溶性氮和有机碳的变化
DOI：
10.1007/s11104-021-04934-9
复制
发表时间：
2021
期刊：
影响因子：
4.9
通讯作者：
Han Dongdong
中科院分区：
文献类型：
--
作者：
Weng Yuetai;Yang Guang;Wang Lixuan;Quan Xiankui;Di Xueying;Yu Hongzhou;Han Dongdong
北方森林占陆地碳储量的三分之一。野火是这一碳库的一个重要扰动，特别影响到凋落物层。在森林大火之后，由于火烧后植被演替和非生物因子的变化，凋落物层可能具有变化的化学性质和分解动态。沿着火烧史梯度分布的北方森林Oi层和Oe层凋落物层中WSOC和WSN的含量分别为高于Oe层。浓度显着改变火灾，并表现出不同的生态演替的反应。火灾发生时间与Oi层和Oe层WSOC呈显著正相关。有趣的是，基于距离的冗余分析和结构方程模型分析表明，火灾后的时间因素也强烈影响凋落物水溶性物质（WSM）的属性。生物因子与Oe层凋落物WSM的相关性比Oi层更强。虽然生物因素的贡献小于非生物因素的WSM属性，他们仍然发挥了重要作用，在凋落物WSM在burnedarea.ConclusionsOur研究结果表明，操纵生物因素可以是一个重要的管理策略，凋落物WSM恢复，这可以帮助整体生态恢复面临着越来越大的危险，在全球气候变化的野火烧毁森林。
Background and aimBoreal forests account for one third of terrestrial carbon stock. Wildfires are an important perturbation of this carbon pool, affecting in particular the litter layer. After forest fires, the litter layers may possess shifting chemical property and decomposition dynamics due to the changes in post-fire vegetations succession and abiotic factors.MethodsWe measured water-soluble organic carbon (WSOC) and water-soluble nitrogen (WSN) in the litter layers of Oi and Oe horizons in boreal forests along a gradient of fire history in northeastern China.ResultsWe found that WSOC and WSN concentrations in the Oi layer were higher than those in the Oe layer. The concentrations were markedly altered by fires and showed different responses to the ecological succession. The time since fire had significant positive correlations with WSOC in Oi and Oe layers. Interestingly, the distance-based redundancy analysis and the structural equation model analysis indicated that factors additional to the time since fire also strongly influenced the litter water-soluble matter (WSM) properties. Biotic factors were more strongly correlated with the litter WSM properties in the Oe layer than in the Oi layer. Although biotic factors contributed less than abiotic factors to the WSM properties, they still play significant roles in litter WSM in burned area.ConclusionsOur results show that manipulating biotic factors can be an important management strategy for litter WSM restoration, which can assist the overall ecological restoration in burned forests faced with the increasing danger of wildfires in the changing global climate.