Spatio-temporal dynamics of seedling communities are determined by seed input and habitat filtering in a subtropical montane forest
Spatio-temporal dynamics of seedling communities are determined by seed input and habitat filtering in a subtropical montane forest
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亚热带山地森林中幼苗群落的时空动态由种子输入和生境过滤决定
DOI：
10.1016/j.foreco.2019.117475
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发表时间：
2019-10
影响因子：
3.7
通讯作者：
Jiang Mingxi
中科院分区：
文献类型：
--
作者：
Xu Yaozhan;Wan Dan;Xiao Zhiqiang;Wu Hao;Jiang Mingxi
幼苗群落物种丰富度和分布的时空变化对维持物种多样性具有重要作用，可以预测森林群落未来的变化。在2012-2017年的6年期间，我们监测了八大公山（BDGS）25公顷森林动态样地中405个1 m2幼苗样地内12，830株幼苗的动态。我们提出了在过去的六年中，15个优势幼苗物种的相对丰度的变化，评估物种丰富度，物种周转，幼苗密度，物种重排（相对丰度的平均秩转移; MRS）和社区相似性的时间变化在三个地形定义的栖息地（山脊，斜坡和山谷），并探讨幼苗群落的动态机制。此外，我们探讨了物种的生态指标值（EIV）和功能组的物种获得和损失在研究期间的差异。在三个生境类型，有巨大的15个优势幼苗物种的重新排序，一些桅杆幼苗事件被清楚地确定。物种丰富度和幼苗密度在整个普查年度持续下降，除了2012-2013年物种丰富度增加。三种生境类型的物种周转率随时间波动，总体而言，物种迁移率高于物种迁入率。低土壤C：N比，光可用性和VDCN（垂直距离以上的通道网络），但较高的土壤pH值和TWI（地形湿度指数），山谷有较低的物种丰富度和茎密度，和较高的物种周转和物种重排比斜坡和山脊。在整个群落范围内，物种组成发生了重大的方向性变化的山脊和斜坡。新的殖民物种通常是更耐荫，水分和温度要求的灌木物种和低pH值，但高肥力的土壤中生长。在BDGS样地中，物种丰富度和幼苗密度在前两年波动，然后随着时间的推移而下降，这反映了生境过滤和种子输入调节物种组成的时间动态，但相对重要性在研究年份之间存在差异。在该亚热带森林中，物种组成表现出明显的方向性变化。在山脊和坡地，灌木种类的增加幅度大于其他层种。值得注意的是，需水量更大的物种的优势增加，可能会增加全球气候变化（如干旱）下的死亡风险。
Spatial and temporal variation in species abundances and distributions of the seedling community, which plays a pivotal role in maintaining species diversity, can help predict future changes in forest communities. We monitored the dynamics of 12,830 seedlings within 405 1-m2seedling plots in the Badagongshan (BDGS) 25-ha forest dynamic plot over a 6-year period (2012–2017). We presented changes in the relative abundance for 15 dominant seedling species during the last six years, assessed temporal changes in species richness, species turnover, seedling density, species reordering (mean rank shift of the relative abundance; MRS) and community similarity within three topographically defined habitats (ridge, slope and valley), and explored the mechanisms underlying dynamics of seedling communities. Furthermore, we explored differences in species’ ecological indicator values (EIVs) and functional groups for species gained and lost during the study period. Across three habitat types, there were enormous reordering of the 15 dominant seedling species; a few mast-seedling events were clearly identified. Both species richness and seedling density continually declined over the entire census year, except for an increase of species richness during 2012–2013. Species turnover fluctuated temporally in three habitat types; overall, species emigration rate was higher than species immigration rate in three habitats. Valleys with lower soil C:N ratio, light availability and VDCN (vertical distance above the channel network), but higher soil pH and TWI (topographic wetness index), had lower species richness and stem density, and higher species turnover and species reordering than slopes and ridges. At the community-wide scale, significant directional changes in species composition occurred on ridges and slopes. Newly colonizing species were typically more shade- tolerant, water- and temperature- demanding shrub species and grown on soil with low pH but high fertility. In the BDGS plot, species richness and seedling density fluctuated in the first two years and then decreased over time, which reflects that both habitat filtering and seed input regulated temporal dynamics of species composition, but the relative importance varied among studied years. In this subtropical forest, species composition showed obvious directional changes. Shrub species increased more than species of other strata in ridge and slope areas. It is worth noting that an increased dominance of species that are more water-demanding could increase the risk of mortality under global climate change (e.g. drought).
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DOI：
10.1101/062133
发表时间：
2016-07
期刊：
bioRxiv
影响因子：
--
作者：
M. Vellend;M. Dornelas;L. Baeten;R. Beauséjour;Carissa D. Brown;P. De Frenne;S. Elmendorf;N. Gotelli;Faye Moyes;I. Myers-Smith;A. Magurran;B. McGill;Hideyasu Shimadzu;C. Sievers
通讯作者：
M. Vellend;M. Dornelas;L. Baeten;R. Beauséjour;Carissa D. Brown;P. De Frenne;S. Elmendorf;N. Gotelli;Faye Moyes;I. Myers-Smith;A. Magurran;B. McGill;Hideyasu Shimadzu;C. Sievers
影响因子：
5.5
作者：
Natalia Norden;J. Chave;P. Belbenoit;Adeline Caubère;P. Châtelet;P. Forget;B. Riera;J. Viers;C. Thébaud
通讯作者：
Natalia Norden;J. Chave;P. Belbenoit;Adeline Caubère;P. Châtelet;P. Forget;B. Riera;J. Viers;C. Thébaud
影响因子：
2.7
作者：
Joseph S. Wright
通讯作者：
Joseph S. Wright
影响因子：
5.5
作者：
Ferry, Bruno;Morneau, Francois;Freycon, Vincent
通讯作者：
Freycon, Vincent
影响因子：
4.8
作者：
Collins, Scott L.;Suding, Katharine N.;Clark, Christopher M.
通讯作者：
Clark, Christopher M.