Seasonal variation of soil aggregate stability of typical yellow brown soil in grasslands with different root structures
[Objective]The aims of this study are to explore the seasonal variation characteristics of aggregate stability and its influencing factors in Yellow Brown Soil,and to provide a theoretical and practical basis for regional soil erosion control.[Methods]The paired T-test was used to analyze the seasonal variation differences of aggregate stability among the three types of plots,fibrous root(Setaria viridis),straight root(Artemisia apiacea)and bare ground control.The factors affecting the seasonal variation of aggregate stability were determined by Pearson correlation analysis.The fitting equation of aggregate stability was established by regression analysis.[Results]The MWD of Setaria viridis and Artemisia apiacea fluctuated significantly with seasonal changes.Both MWD of Setaria viridis and Artemisia apiacea were significantly different from that of bare ground(p＜0.05).However,there existed no significant difference between them(p＞0.05).The MWD in Setaria viridis and Artemisia apiacea was significantly affected by root density(p＜0.05).There was a significant correlation between the MWD of Artemisia apiacea and soil compactness.Regression analysis showed that MWD could be well fitted with root density and compactness(R2=0.730,NSE=0.730).[Conclusion]The root structures of both grasslands enhanced soil aggregates stability in yellow brown soil and significantly influenced the seasonal variations of soil aggregate stability.However,the impact of different root structures on soil aggregates stability did not show any significant differences.
soil aggregate stabilityseasonal variationplant rootsroot type
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