Soil moisture regime and canopy closure structure subalpine understory development during the first three decades following fire
نویسندگان
چکیده
Subalpine coniferous forests are adapted to cycles of fire and successional development, but increasing frequency severity altering historical stand structure, composition, plant diversity. For instance, conifer regeneration has become increasingly variable as a result prolonged aridity following fire, the potential cascading effects on understory community development remain virtually unexplored. We used natural experiment investigate relationships among succession, soil moisture regime, tree canopy over 30 years 1988 fires in Greater Yellowstone Ecosystem, U.S.A. In 1990, at each two study areas, plots were established different site types defined by burn status (burned or unburned) regime (mesic xeric), determined using biophysical indicators. asked: (1) Are differences associated with composition (species richness, diversity, functional group representation) during first three decades after fire? (2) Does relationship between change time subcanopy (height >137 cm) densities increase? confirmed our original designations situ measurements moisture. Over decade species richness diversity lower xeric-burned than mesic-burned plots. Nearly south-aspect area, where low, seral understories diverged regime. There, graminoid cover was 23-fold higher, forb 3-fold lower, contrast, mixed aspect markedly higher. did not vary converging successionally becoming more similar unburned forest communities. Our results suggest that site-specific regimes structure early trajectory post-fire recovery, diminishes canopies develop time. However, under warming climate, may compound aridity, particularly xeric sites, resulting decreases cover, increases for altered dynamics.
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ژورنال
عنوان ژورنال: Forest Ecology and Management
سال: 2021
ISSN: ['0378-1127', '1872-7042']
DOI: https://doi.org/10.1016/j.foreco.2020.118783