火是森林生态系和牧场生态系统中的一个自然因子。火能破坏生态系统;也能有益于生态系统。火的效应涉及许多因子,其中包括火烧的强度。强度大的火烧会烧死上层乔木,危害表层土壤等等;而强度小的火烧,通常会产生有益的影响。一、火烧的效应火能烧掉活的和死的森林可燃物放出矿质养料。它能影响生物环境。释放的养料 Fire is a natural factor in forest ecosystems and pasture ecosystems. Fire can destroy ecosystems; it can also benefit ecosystems. The effects of fire involve many factors, including the intensity of fire. Strong fire burns the upper tree, endanger the surface soil, etc .; and the less intense fire, usually have a beneficial impact. First, the fire effect Fire can burn live and dead forest combustible release of mineral nutrients. It can affect the biological environment. Free nourishment