Disturbance: a double‐edged sword for restoration in a changing climate
Disturbance: a double‐edged sword for restoration in a changing climate
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干扰：气候变化中恢复的双刃剑
DOI：
10.1111/rec.13675
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发表时间：
2022
影响因子：
3.2
通讯作者：
L. Hallett
中科院分区：
文献类型：
--
作者：
A. Brambila;Paul B. Reed;S. Bridgham;B. Roy;Bart R. Johnson;Laurel E. Pfeifer‐Meister;L. Hallett
生态恢复往往依赖干扰作为建立目标植物群落的工具，但干扰可能是一把双刃剑，有时会引发入侵和意想不到的结果。在这里，我们测试了旨在提高恢复播种成功的火灾干扰，与气候和初始植被条件相结合，如何改变太平洋西北草原的多年生和一年生草本植物优势地位和整体群落多样性。我们沿着从俄勒冈州南部到华盛顿州中西部的纬度气候梯度的三个地点，在成对的、重复的烧毁-未烧毁的地块上播种了原生和引进的多年生牧草和原生杂草。每个地点过去的恢复和气候操纵增加了不同地块之间开始条件的差异。焚烧促进了现存杂草和多年生草本植物在所有地点的扩张。焚烧还提高了北部和中部原生多年生牧草和原生杂草的播种成功率，以及在所有三个地点引种多年生牧草的成功。一年生草本植物的优势更多地是由纬度驱动的，而不是燃烧，一年生草本植物在南部保持优势，多年生植物在北部保持优势。与此同时，所有遗址周围未恢复的草原仍然以多年生草本植物为主，这表明最初的地块清理可能允许南部遗址每年的草地入侵。当与干扰结合在一起时，进一步变暖可能会增加一年一度的草优势的风险，这是一种潜在的持久状态。
Ecological restoration often relies on disturbance as a tool for establishing target plant communities, but disturbance can be a double‐edged sword, at times initiating invasion and unintended outcomes. Here we test how fire disturbance, designed to enhance restoration seeding success, combines with climate and initial vegetation conditions to shift perennial versus annual grass dominance and overall community diversity in Pacific Northwest grasslands. We seeded both native and introduced perennial grasses and native forbs in paired, replicated burned‐unburned plots in three sites along a latitudinal climate gradient from southern Oregon to central‐western Washington. Past restoration and climate manipulations at each site had increased the variation of starting conditions between plots. Burning promoted the expansion of extant forbs and perennial grasses across all sites. Burning also enhanced the seeding success of native perennial grass and native forbs at the northern and central site, and the success of introduced perennial grasses across all three sites. Annual grass dominance was driven more by latitude than burning, with annuals maintaining their dominance in the south and perennials in the north. At the same time, unrestored grasslands surrounding all sites remained dominated by perennial grasses, suggesting that initial plot clearing may have allowed for annual grass invasion in the southern site. When paired with disturbance, further warming may increase the risk of annual grass dominance, a potentially persistent state.
气候操纵对北部范围内和之外的植物种群动态的影响不同
影响因子：
5.5
作者：
Reed, Paul B.;Peterson, Megan L.;Pfeifer‐Meister, Laurel E.;Morris, William F.;Doak, Daniel F.;Roy, Bitty A.;Johnson, Bart R.;Bailes, Graham T.;Nelson, Aaron A.;Bridgham, Scott D.
通讯作者：
Bridgham, Scott D.