  This paper studied the relationship between the decomposition rate of fungi
and temperature, humidity, fungus elongation, moisture tolerance and fungus
density in a given volume in the presence of a variety of fungi, and
established a series of models to describe the decomposition of fungi in
different states. Since the volume of soil was given in this case, the latter
two characteristics could be attributed to the influence of the number of
fungal population on the decomposition rate. Based on the Logistic model, the
relationship between the number of population and time was established, and
finally the number of fungi in the steady state was obtained The interaction
between different species of fungi was analyzed by Lotka-Volterra model, and
the decomposition rate of various fungal combinations in different environments
was obtained. After studying the one and two cases, we can extrapher from one
to the other, and the community consisting of n fungal populations will be
similar to the community consisting of n+1 fungal populations. After the study,
we substituted the collected data into the model and found that the fungal
community composed of two kinds of fungi had a lower decomposition rate of
ground decomposition or wooden fiber than that of a single kind of fungus for
the same kind of substance. We found that the fungus in warm and humid
environment of decomposition rate is highest, the change of the atmospheric
cause some fungal population growth rate decreases, there are also some will
increase, which is associated with the nature of fungi.We analyzed the
influence of environmental factors, namely temperature and humidity, on the
model.
