Soil texture affects the effect degree of biological soil crusts on soil properties
Biological soil crusts(biocrusts)are widely distributed in arid and semi-arid regions,and have a significant impact on topsoil properties.However,it is still unclear whether the effects of different types or development stages of biocrusts on soil properties under different soil texture conditions,and whether biocrusts interact with soil texture.In this study,different types of biocrusts(algal crusts,mixed crusts and moss crusts)developed on silty loam,sandy loam and sandy soils on the Loess Plateau were used as research objects,and the effects of different types of biocrusts on soil properties under different soil texture conditions were compared,and the results showed that:(1)Biocrusts on silty loam and sandy loam had no significant effect on soil particle composition,while biocrusts on sandy soil significantly increased the content of clay,fine powder and coarse powder.Among them,biocrusts had the greatest effect on the content of coarse powder on sand soil.Among the different types of biocrusts,mixed crusts had the greatest effect on the composition of sand particles,and moss crusts had the deepest influence depth,which was 5 cm below the biocrusts.(2)Biocrusts with different soil textures could reduce soil bulk density,and moss crusts on sandy soil had the greatest reduction in soil bulk density,reducing it by 17%.(3)Biocrusts of the three soil textures could increase the soil organic matter and total nitrogen content to different degrees,among which the biocrusts of sandy soil had the greatest degree of influence,and the influence degree of moss crusts was the most significant,and the organic matter content and total nitrogen content were 17.6 and 13.5 times that of the control,and the depth of influence was 10 cm below the biocrusts.(4)There were significant interaction effects between soil texture and biocrusts type on soil bulk density,soil organic matter and total nitrogen,and the single effect was greater than the interaction between the two.(5)Biocrusts on sandy soil had the greatest influence on soil properties,and moss crusts had a more significant impact.In summary,biocrusts of sandy soil on the Loess Plateau had the greatest influence on soil properties,and the moss crusts had a more obvious effect on soil properties.The research results can provide a theoretical basis for deepening the ecological function of biocrusts and sustainable ecosystem management.
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