Changes in Morphological Succession and Moisture-nutrient Characteristics of Mound Under Shrub Patch in Water-wind Erosion Crisscross Region
LU Rong;JIA Chao;HAO Hongmin;HUANG Ze;LIU Yu;MIAO Haitao;WU Gaolin;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources;
The shrub mound is a typical aeolian landform in the cross areas of wind-water erosion on Loess Plateau in China.Four sizes scale shrub mounds were selected to analyze the mound basic form,soil properties and correlations.The results showed:(1)The shrub succession significantly affected the development of mound.The mound volume was increased as the shrub biomass expansion.Until the shrubs succeeds in the stabilization phase,the mound volume tends to be stable(P 0.05).(2)The amount,height and soil bulk density of the mound varied in the different position:the binding-sand quantity and height of the mound were the largest at the trap root,but were lowest in the edge.The soil bulk density showed the opposite characteristics.(3)The soil organic matter content of mound under the death,large,medium and small shrub patches were 1.54,1.92,1.46 and 1.30 times than the bare land,respectively;the soil moisture were 2.05,1.93,1.79 and 1.52 times than that of the bare land,respectively.(4)The soil moisture and soil organic matter content in the edge of the mound to three quarters of the trap root were higher than those in other positions of the mound.