Strong influences of stand age and topography on post-fire understory recovery in a Chinese boreal forest
Strong influences of stand age and topography on post-fire understory recovery in a Chinese boreal forest
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林龄和地形对中国北方森林火灾后林下恢复的强烈影响
DOI：
10.1016/j.foreco.2020.118307
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发表时间：
2020-10
影响因子：
3.7
通讯作者：
Han Shijie
中科院分区：
文献类型：
--
作者：
Liu Bo;Biswas Shekhar R.;Yang Jian;Lite Zhihua;He Hong S.;Liang Yu;Lau Matthew K.;Fang Yunting;Han Shijie
火灾后土壤资源数量、异质性以及林下特征随林龄的变化而变化，对火灾后林下恢复产生强烈影响。在本研究中，我们旨在评估火灾干扰后北方森林演替过程中土壤资源（氮含量和异质性）、地形位置（坡向）、上层特征（断面积）和林龄如何影响林下特征（覆盖度、丰富度、均匀度和组成）。我们收集了中国东北北方森林火灾后 4 至 203 年的 76 个林分的植物群落和环境数据。我们分别测试了所考虑的因素对总林下植被、灌木和草本特征的影响。朝南的斜坡和平坦地区的林下总覆盖率高于朝北的斜坡。平坦地区和朝南斜坡的总林下植被、灌木和草本植物的物种丰富度高于朝北斜坡。林下和灌木总盖度随林龄、土壤氮含量和林间断面积的变化呈增加趋势，随土壤氮异质性的变化呈下降趋势，而草本覆盖度在三个地形位置上均呈现相反的趋势。林下丰富度随土壤氮含量呈减少趋势，随土壤氮异质性和林间断面积呈增加趋势。林下总均匀度随土壤氮含量、异质性和林龄呈平缓趋势，随林上断面积呈下降趋势。林下群落组成主要受地形位置、林龄和林间断面积的影响。在林下恢复期间，群落组成从不耐荫物种转变为耐荫物种。我们的研究结果强调了地形和林龄在中国北方森林火灾后林下恢复中的重要性，通过光和土壤养分的可用性来调节。
Soil resource quantity and heterogeneity as well as overstory characteristics change along with stand age after fire disturbance, imposing strong influences on post-fire understory recovery. In this study, we aimed to assess how soil resource (nitrogen quantity and heterogeneity), topographic position (aspect), overstory characteristics (basal area), and stand age affected understory characteristics (cover, richness, evenness, and composition) during boreal forest succession after fire disturbance. We collected plant community and environmental data from 76 stands aged at 4 to 203 years post-fire in the boreal forest of Northeast China. We separately tested the effects of the considered factors on the characteristics of total understory, shrubs, and herbs. Total understory cover was higher at the south-facing slopes and flat locations than at north-facing slopes. Species richness of total understory, shrubs, and herbs was higher at the flat locations and south-facing slopes than at the north-facing slopes. The cover of total understory and shrubs showed increasing trends along with stand age, soil nitrogen quantity, and overstory basal area as well as decreasing trends along with soil nitrogen heterogeneity, while the cover of herbs showed reversed trends across all the three topographic positions. Understory richness showed decreasing trends along with soil nitrogen quantity as well as increasing trends along with soil nitrogen heterogeneity and overstory basal area. Total understory evenness showed flat trends along with soil nitrogen quantity, heterogeneity, and stand age as well as decreasing trends along with overstory basal area. Understory community composition was mainly affected by topographic position, stand age, and overstory basal area. During understory recovery, community composition shifted from shade-intolerant species to shade-tolerant species. Our results highlight the importance of topography and stand age in post-fire understory recovery in boreal forests of China, mediated through availability of light and soil nutrients.
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影响因子：
1.7
作者：
R. Warren
通讯作者：
R. Warren
影响因子：
5.5
作者：
Mark C. Brundrett;R. Dongen;B. Huntley;N. Tay;V. Longman
通讯作者：
Mark C. Brundrett;R. Dongen;B. Huntley;N. Tay;V. Longman
影响因子：
1.8
作者：
Jun Ma;Rencang Bu;Miao Liu;Yu Chang;Fenglin Han;Q. Qin;Yuanman Hu
通讯作者：
Jun Ma;Rencang Bu;Miao Liu;Yu Chang;Fenglin Han;Q. Qin;Yuanman Hu
影响因子：
6.1
作者：
Halpern, Charles B.;Lutz, James A.
通讯作者：
Lutz, James A.
影响因子：
4.8
作者：
C. Hargrave;K. Hambright;L. Weider
通讯作者：
C. Hargrave;K. Hambright;L. Weider