Effects of different tillage methods on soil pore structure and penetration resistance of slope farmland in south China
Reasonable tillage methods are the key factors for sustainable agricultural production. In this paper, the soil in the cultivated land was taken as the research object, the soil pore structure and penetration resistance and their correlations under different tillage methods were analyzed. Results showed that:Compared with conventional-tillage treatment, no-tillage treatment can significantly increase soil non-capillary porosity in the lower layer (10～20 cm) and total soil porosity in the bottom layer (20～30 cm) ; compaction has no significant effect on soil pore structure and penetration resistance; however, conventional-tillage treatment and compaction+conventional-tillage treatment resulted in poor soil pore structure in the bottom layer of the tillage; deep-tillage treatment and conventional+subsoiling-tillage treatment had the best effect on soil non-capillary porosity, total porosity and soil penetration resistance of the lower layer and bottom layer. The tillage method has little effect on soil capillary porosity. The results of regression analysis show that soil total porosity (R2=0.35, P<0.01) and non-capillary porosity (R2=0.42, P<0.01) demonstrate a good linear relationship with soil penetration resistance. The tillage treatment can affect the formation of soil pore structure, and thus, affect the soil penetration resistance. In general, deep-tillage treatment and conventional+subsoiling-tillage treatment is more conducive to the construction of loose, porous soil structure, which is conducive to water-harvesting, moisture-conserving and soil quality.
slope farmlandcone indexmechanical compactionconventional tillagepore distribution
NETL
NSTL
万方数据
维普
