Objective:This study aimed to investigate the effects of soil particle size and community di-versity on soil fertility and structural stability. Methods:10 typical vegetation communities in the Ulan Buh Desert were selected as the research objects. The soil particle size and fractal dimension in the 0～100 cm soil layer were analyzed to elucidate the relationship between soil particle size and plant commu-nity diversity characteristics. Results:The plant species in the study area were mainly grasses and le-gumes,with a total of 51 species. Significant differences were found in soil particle size and fractal di-mension. The fractal dimension was significantly positively correlated with the percentage of clay sand (R2=0.9026,P<0.01),indicating its effectiveness as an evaluation indicator of soil properties. The fractal dimension of the Tamarix chinensis community (2.822±0.028) was the highest,while that of the Kalidium foliatum community (2.748±0.032) was the lowest,indicating different plants' abilities to adsorb and fix soil particles. In terms of community diversity,the Simpson's diversity index showed that the diversity of the Haloxylon ammodendron community was the highest,while that of the Tamarix chinensis community was the lowest,closely related to the soil environment. This further indicated that changes in community diversity were affected by spatial distribution,vegetation composition,and quantity changes,and these factors jointly acted on soil particle size and fractal dimension. Therefore,a complex interaction existed between desert plant community diversity and soil particle size. Conclusion:The plant species in the Ulan Buh Desert were relatively simple,and the diversity index was low. The fractal dimension was closely related to soil particle size and was an effective indicator for characteriz-ing soil texture and restoration potential. For ecological restoration and soil management in this area,a scientific strategy should be formulated by considering the relationship between plant diversity and soil characteristics to promote the health and sustainable development of the ecosystem.
Soil particle sizeSoil fractal dimensionCommunity species diversityUlan Buh desert
维普
万方数据
