Biological soil crust plays an important ecological function in desert ecosystems,but different types
of biological soil crust have great differences in ecological functions due to their different compositions and pro‐
portions of organisms. This article is intended for the development of stable moss and algae crust in Mu Us Sandy
Land,through field survey monitoring and indoor index determination,in-depth analysis of the influence scale
of two types of biological crust on soil water content,wind erosion,nutrient content,and establishing a compre‐
hensive evaluation model quantitatively contrasts the ecological function differences between the two. The results
show that:(1)the soil water content of the two types of the biological soil crust increases first and then decreas‐
es fluctuating with the increase of soil depth. There is a significant (P<0.05)difference in soil water content be‐
tween the two biological soil crusts,which indicates that the soil water content of moss crust is greater than that
of algae crust in the depth range of 0-80 cm,and the opposite is true in the depth range between 90-100 cm;
(2)compared with bare land,the soil wind erosion under the influence of moss crust and algae crust decreased
by 156.0% and 136.6%,respectively,but there is no significant difference between them;(3)the soil nutrient
content under the influence of the two types of crust is significantly different(P<0.05),showing that the total ni‐
trogen,total phosphorus,and organic matter content of the soil under the moss crust are 3.3 times,3.5 times,
and 2 times of the algal crust,respectively;(4)the comprehensive scoring order of ecological functions of differ‐
ent types of biological crust is:moss crust>algal crust>bare land(1.60>-0.64>-9.78). This study confirmed the
differences in the ecological functions of different types of biological soil crust in desert ecosystems,and their
contribution to maintaining the circulation of soil,water and nutrients,highlighting the accurate classification of
their types or compositions in exploring the importance of biological soil crust.
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