Herbaceous vegetation responses to experimental fire in savannas and forests depend on biome and climate
Herbaceous vegetation responses to experimental fire in savannas and forests depend on biome and climate
复制标题
稀树草原和森林中草本植被对实验火灾的反应取决于生物群落和气候
DOI：
10.1111/ele.14236
复制
发表时间：
2023
期刊：
影响因子：
8.8
通讯作者：
Hobbie, Sarah E.
中科院分区：
文献类型：
--
作者：
Gold, Zachary J.;Pellegrini, Adam F.;Refsland, Tyler K.;Andrioli, Romina J.;Bowles, Marlin L.;Brockway, Dale G.;Burrows, Neil;Franco, Augusto C.;Hallgren, Steve W.;Hobbie, Sarah E.
火-植被反馈可能维持全球稀树草原和森林分布。因此，热带稀树草原和森林生态系统中的植被对火灾的反应应该不同，但草本植被的火灾反应数据尚未在生物群落中综合。在这里，我们研究了草本植物的反应，实验火在30个网站跨越四大洲。在各种指标中，草本植被在火灾发生的地方大量增加，在较潮湿、较凉爽和/或季节性较弱的系统中对火灾的反应更大。与森林相比，热带稀树草原与燃烧与未燃烧地块的草本植被丰度差异大4.8（±0.4）倍。特别是，草覆盖减少与火灾排除在稀树草原，主要是通过减少C4草覆盖，而火灾频率的变化有一个相对较弱的影响，在森林中的草覆盖。这些不同的反应强调了火灾对维持热带稀树草原和森林植被结构的重要性。
Fire–vegetation feedbacks potentially maintain global savanna and forest distributions. Accordingly, vegetation in savanna and forest ecosystems should have differential responses to fire, but fire response data for herbaceous vegetation have yet to be synthesized across biomes. Here, we examined herbaceous vegetation responses to experimental fire at 30 sites spanning four continents. Across a variety of metrics, herbaceous vegetation increased in abundance where fire was applied, with larger responses to fire in wetter and in cooler and/or less seasonal systems. Compared to forests, savannas were associated with a 4.8 (±0.4) times larger difference in herbaceous vegetation abundance for burned versus unburned plots. In particular, grass cover decreased with fire exclusion in savannas, largely via decreases in C4grass cover, whereas changes in fire frequency had a relatively weak effect on grass cover in forests. These differential responses underscore the importance of fire for maintaining the vegetation structure of savannas and forests.