The Influence of Different Land Use Manners on Soil Aggregate Characteristics of Consolidation and Returning to Field in Hollow Village of Hilly Area

The research aimed to explore the influence of different land use manners on soil aggregate, and provide scientific basis for improving soil stability and production performance of consolidation and returning to field in hollow village of hilly area. After consolidation and returning to field in hollow village of hilly area of Chengcheng County, Shaanxi, 5 kinds of land use manners were set for 1-year plantation test, and they were corn （C treatment）, wheat （W treatment）, vegetable （V treatment）, medicinal material （M treatment） and control （no plantation: CK treatment）. Soil aggregate distribution, mean mass diameter（WMD）, geometric mean diameter（GMD）, aggregate failure rate（PAD）, unstable aggregate number（ELT）and fractal dimension（D） at 0-40 cm of soil layer were measured and analyzed by dry and wet sieving methods. The results showed that （i） soil aggregate number and size at 0-40 cm of soil layer by each treatment were all significantly better than CK treatment, and >0.25 mm of aggregate content by dry sieving method （DR0.25）and >0.25 mm of aggregate content by wet sieving method （WR0.25）at 0-40 cm of soil layer in each treatment showed declining trend with soil layer depth increased; （ii）MWD and GMD sequences of each treatment at 0-40 cm of soil layer by dry and wet sieving methods were both W treatment>C treatment>M treatment>V treatment>CK treatment, and C treatment was conducive to increasing large aggregate content of surface soil, while W treatment was conducive to increasing large aggregate content of lower soil; （iii）the analysis by wet sieving method showed that PAD and ELT at 0-40 cm of soil layer in each treatment both showed similar “Z” shape trend, and each treatment was significantly lower than CK;（iv）D sequence at 0-40 cm of soil layer in each treatment was C treatment0.25 mm of aggregate content at 0-40 cm of soil layer by dry and wet sieving methods, and they were respectively R2=0.74 and R2=0.67. Corn and wheat plantation after consolidation and returning to field in hollow village was conducive to improving large aggregate content at 0-40 cm of soil layer, increasing the stability of soil layer and improving soil structure.