Item talk:Q257956

From geokb

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   "name": "Understanding grass invasion, fire severity, and Acacia koa regeneration for forest restoration in Hawai\u02bbi Volcanoes National Park",
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     "name": "Land",
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   "abstract": "With invasive grasses increasing wildfire occurrence worldwide, a better understanding of the relationships between native plants, fire, and invasive grass is needed to help restoration plans facilitate ecosystem resilience. Invasive grasses are particularly problematic for altering fire regimes in the tropics, yet in Hawai\u02bbi, restoration sites are often planted with monocultures of the native tree\u00a0Acacia koa,\u00a0which can promote grass growth via nitrogen fixation. This, combined with the difficulty of estimating pre-fire grass cover under thick canopies, complicates attempts to restore Hawaiian ecosystems. We studied the 2018 Keauhou Ranch Fire in Hawai\u02bbi to investigate three questions: (1) at what level of precision can pre-fire grass cover be accurately estimated from oblique aerial photos? (2) how are post-fire\u00a0A. koa\u00a0regeneration densities affected by fire severity? and (3) how are post-fire\u00a0A. koa\u00a0regeneration densities affected by pre-fire grass cover and its interaction with fire severity? We collected burn severity and post-fire regeneration data from 30 transects stratified across mid-elevation woodland, montane woodland, and montane shrubland communities. We evaluated visual estimates of pre-fire grass cover from oblique aerial imagery with quantitative in situ data from 60 unburned transects of the same cover types. Pre-fire estimates of grass cover categories were 67% accurate in montane woodland (n\u00a0= 9) and 100% accurate in montane shrubland (n\u00a0= 11), but only 20% accurate in mid-elevation woodland (n\u00a0= 10). In montane woodlands with low pre-fire tree densities,\u00a0A. koa\u00a0regeneration densities were higher with increased fire severity, but this trend reversed when pre-fire tree densities were high. We detected no effect of pre-fire grass cover, nor its interaction with fire severity, on\u00a0A. koa\u00a0regeneration density. This indicates that restoration through the planting of\u00a0A. koa\u00a0may be successful in promoting fire-resilient\u00a0A. koa\u00a0forest, although there are potential issues to consider regarding the effects that\u00a0A. koa\u2019s grass promotion may have on other species within the ecosystem.\u00a0",
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