5. Conclusions
This research analyses the common algae and moss biological soil crusts
in the typical farming-pastoral ecotone. Using wind tunnel tests, the
effects of wind speed and coverage on wind erosion and particulate
matter emissions were studied and the relationship between particulate
matter emission and wind erosion was analyzed. From the perspective of
wind erosion, the influence of wind speed and coverage is similar.
However, from the perspective of particulate matter emissions, the
influence of coverage is always higher than wind speed, which is
determined by the structure and nature of the biological soil crust
itself. The proportion of particulate matter emitted from biological
soil crusts in the amount of wind erosion has a significant behavior.
Although the overall particulate matter emissions increase with
increasing wind speed, the proportion of particulate matter emissions in
the wind erosion is inversely proportional to the wind speed and
coverage due to the corresponding changes in the amount of wind erosion.
According to the trend of the proportion with wind speed, the particle
emission capacity of moss crust is directly proportional to the particle
size and inversely proportional to the coverage. The particle emission
capacity of algae crust is proportional to the particle size, but its
relationship with coverage is not regular. The results of this study can
be relevant for the control of wind erosion and particulate matter
emissions.