Recovery of understory vegetation biomass and biodiversity in burned larch boreal forests in Northeastern China
Recovery of understory vegetation biomass and biodiversity in burned larch boreal forests in Northeastern China
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DOI：
10.1080/02827581.2015.1072238
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发表时间：
2016-05
影响因子：
1.8
通讯作者：
Jun Ma;Rencang Bu;Miao Liu;Yu Chang;Fenglin Han;Q. Qin;Yuanman Hu
中科院分区：
文献类型：
--
作者：
Jun Ma;Rencang Bu;Miao Liu;Yu Chang;Fenglin Han;Q. Qin;Yuanman Hu
摘要火干扰后森林林下植被生物量和生物多样性的恢复已被广泛研究，然而，这种关系如何变化，以及在不同的火后阶段的决定因素是什么，在北方落叶松林还不清楚。我们调查了81林下地块的落叶松林火灾在1987年（S5），1992年（S4），1996年（S3），2002年（S2），或2007年（S1）的时间序列。采用方差分析方法对火烧后不同阶段生物多样性和生物量的差异进行了检验。采用不同的回归模型拟合生物量与生物多样性之间的关系，并通过推升回归树分析确定影响生物量与生物多样性关系的因素。结果表明，林下植物总生物量从S1的2.51 t ha − 1增加到S3的8.47 t ha − 1，并在S5下降到5 t ha − 1。物种丰富度和物种多样性之间也存在类似的动态变化。在火灾后的大部分时期，生物量和生物多样性之间存在正线性相关关系。坡度和林分密度是影响火烧迹地林下植被次生演替的两个最重要的因子。地理因素和林下竞争决定了植被恢复的方向，火干扰后气候对植被的影响减弱。
ABSTRACT Recovery of biomass and biodiversity of forest understory vegetation after fire disturbance has been widely studied; however, how this relationship changes and what are the determinants at different post-fire stages in larch boreal forests are still unclear. We investigated a chronosequence of 81 understory plots in larch boreal forests that were disturbed by fires in 1987 (S5), 1992 (S4), 1996 (S3), 2002 (S2), or 2007 (S1). Analysis of variance was conducted to test the differences of biodiversity and biomass among various post-fire stages. Different regression models were used to fit the relationship between biomass and biodiversity, while factors influencing this relationship were identified by boosted regression tree analysis. Results showed that total understory biomass increased from 2.51 t ha−1 in S1 to 8.47 t ha−1 in S3 and declined to 5 t ha−1 in S5. Similar dynamics were also found between species richness and species diversity. Positive linear correlations linked biomass and biodiversity throughout most of the post-fire periods. Slope and stand density were the two most important factors influencing the secondary succession of understory vegetation after fire. Geographical factors and overstory competition determine the orientation of vegetation recovery, and the impacts of climate on vegetation are muted after fire disturbances.