Fire and grazing are interactive disturbance processes that are important to the structure
and function of grassland ecosystems including the soils. There have been numerous
studies of nitrogen (N) availability in grasslands that have reported different effects
following grazing and fire. However, these studies have largely neglected the interaction
between fire and grazing. When comparing patches within a patch burn system it was
found that N availability was highest on the most recently burned and grazed patches
relative to the previously burned and grazed patches (Figure 5). Nitrogen availability
was also compared to an annually burned and grazed pasture, with N availability being
greater on the patch burn sites (Figure 5). This greater N availability assists with
creating great plant diversity across the patch burned landscape and providing nutritious
forage for livestock and wildlife.
Figure 5. There is greater available nitrogen from patch burning than from grazing and annually
burning the entire pasture (from Anderson et al. 2006).