关键词: 深松, 免耕, 常规耕作, 土壤容重, 土壤含水量, 土壤入渗速率

Abstract:

To understand the effects of different tillage modes on farmland physical properties in black soil region, a field experiment was conducted at the Arong Banner of Inner Mongolia from June to September, 2016. Three tillage modes included subsoiling (SS), no-tillage (MG) and conventional tillage (CK) were set up. By the collection of the soil samples from 0-10, 10-20 and 20-30 cm respectively, the soil bulk density, moisture and permeability were investigated. The results showed that the soil bulk density and moisture of the three tillage modes were in the order of SS>CK>MG; the eigenvalues of soil infiltration were in the order of initial infiltration rate> average infiltration rate> stable infiltration rate. The soil infiltration rate and cumulative infiltration were in the order of SS>CK>MG. Soil total porosity was the highest under SS treatment, and decreased with the increase of month. Principal component analysis showed that the initial infiltration rate and total infiltration amount were most sensitive to tillage modes, and could be used as evaluation indexes to investigate farmland tillage effect and mitigate black soil degradation in the black soil region of Northeast China. According to the comprehensive score, the performance of soil under different tillage modes was SS>MG>CK. In conclusion, subsoiling tillage could effectively reduce soil bulk density, increase soil water content, and promote soil permeability; no-tillage is more conducive to water conservation and reducing soil evaporation.

Key words: subsoiling, no-tillage, conventional tillage, soil bulk density, soil moisture, soil infiltration rate