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University of Chinese Academy of Sciences (2019)

Investigation of the Spatial Distribution and Multiple Ecological Functions of the Biological Soil Crusts in Mu Us Sandland

李新凯;

Titre : Investigation of the Spatial Distribution and Multiple Ecological Functions of the Biological Soil Crusts in Mu Us Sandland

Auteur : 李新凯;

Grade : Master’s Theses 2019

Université : University of Chinese Academy of Sciences

Résumé partiel
The biological soil crusts are widely distributed in arid and semi-arid ecosystems where the growth of vascular plants are limited,which play important roles in many ecosystem functions including preventing water and soil loss,regulating soil hydrology and promoting nutrient cycling.Understanding the spatial distribution and ecological functions of biological soil crusts is of significance for the scientific management and protection of biological soil crusts and,for the valid assessment of the contribution of biological soil crusts.For getting hold of the growth conditions,spatial distribution and ecological functions of biological soil crusts,this research based on quadrat surveys in 40 sites and long-term monitoring experiment in the typical site in Mu Us Sandland,combined with analysis and measurement in the laboratory,which acquired the local environmental factors,growth factors of biological soil crusts and the data of soil moisture and wind erosion in the monitoring plots.The growth conditions and the spatial distribution of biological soil crusts,the influence of biological soil crusts on soil nutrition,soil moisture and wind erosion were investigated systematically,and the effects of environmental factors on biological soil crusts were analyzed by the structural equation model.The main conclusions are as follows,1)The algae and moss crusts widely contributing in the Mu Us Sandland,the average coverages of algae and moss crusts are 14.1%and 11.3%respectively,the average thicknesses of algae and moss crusts are 4.5 mm and 7.5 mm respectively ;the average height of moss crust is 2.0 mm and the average biomass of moss crusts is 2.2 g/cm 2.The coverage of moss crusts appears to an increasing trend from the northwest to southeast,the coverage of algae crusts is higher in the north and decreases from north to south ;the biomass of moss crusts increases form the west to the east.2)In the plot scale,the algae crusts and moss crusts within different development phases mostly distribute in the shrubland and the bottom land among the sand dunes where the water conditions are better than surrounding areas ;there are almost no biological soil crusts in travelling dune,grassland of desertification,farmland,and other areas like inner city.

Mots clés : Mu Us Sandland; algae crusts; moss crusts; spatial distribution; ecological function;

Présentation (CNKI)

Page publiée le 4 juin 2020