GSTDTAP  > 资源环境科学
DOI10.1111/ele.13676
Fire frequency, state change and hysteresis in tallgrass prairie
Scott L. Collins; Jesse B. Nippert; John M. Blair; John M. Briggs; Pamela Blackmore; Zak Ratajczak
2021-01-14
发表期刊Ecology Letters
出版年2021
英文摘要

Hysteresis is a fundamental characteristic of alternative stable state theory, yet evidence of hysteresis is rare. In mesic grasslands, fire frequency regulates transition from grass‐ to shrub‐dominated system states. It is uncertain, however, if increasing fire frequency can reverse shrub expansion, or if grass‐shrub dynamics exhibit hysteresis. We implemented annual burning in two infrequently burned grasslands and ceased burning in two grasslands burned annually. With annual fires, grassland composition converged on that of long‐term annually burned vegetation due to rapid recovery of grass cover, although shrubs persisted. When annual burning ceased, shrub cover increased, but community composition did not converge with a long‐term infrequently burned reference site because of stochastic and lagged dispersal by shrubs, reflecting hysteresis. Our results demonstrated that annual burning can slow, but not reverse, shrub encroachment. In addition, reversing fire frequencies resulted in hysteresis because vegetation trajectories from grassland to shrubland differed from those of shrubland to grassland.

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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/311340
专题资源环境科学
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Scott L. Collins,Jesse B. Nippert,John M. Blair,et al. Fire frequency, state change and hysteresis in tallgrass prairie[J]. Ecology Letters,2021.
APA Scott L. Collins,Jesse B. Nippert,John M. Blair,John M. Briggs,Pamela Blackmore,&Zak Ratajczak.(2021).Fire frequency, state change and hysteresis in tallgrass prairie.Ecology Letters.
MLA Scott L. Collins,et al."Fire frequency, state change and hysteresis in tallgrass prairie".Ecology Letters (2021).
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