中国农业科学Issue(18)：3800-3808,9.DOI:10.3864/j.issn.0578-1752.2013.18.008
不同轮耕模式对黄土高原旱作麦田土壤物理性状的影响
Effects of Different Rotational Tillage Patterns on Soil Physical Properties in Rainfed Wheat Fields of the Loess Plateau
摘要
Abstract
[Objective]Effects of three different rotational tillage patterns, which were pairwise combined with no-tillage(N), subsoiling(S) and conventional tillage(C), on soil physical structure and stability were studied in rainfed wheat fields of the Loess Plateau.[Method]The experiments of N/S (no-tillage in the first year, subsoiling in the second year, again no-tillage followed by alternating the next year), S/C (subsoiling in the first year, conventional tillage in the second year, again subsoiling followed by alternating the next year) and C/N (conventional tillage in the first year, no-tillage in the second year, again conventional tillage followed by alternating the next year) rotational tillage were conducted in rainfed wheat fields of Weibei highland in summer fallow period from 2007 to 2012, soil bulk density, aggregates amount, size distribution and fractal dimension were observed and examined by dry and wet sieving methods.[Result]The results showed that, compared with pretreatment, soil bulk density of N/S, S/C and C/N rotational tillage treatments in harvest period had no significant differences at 0-60 cm. Soil aggregates properties changed significantly in three different rotational tillage treatments, N/S was higher in the macro-aggregate content (R0.25) and stability rate of water-stable aggregates than S/C and C/N treatments at 0-10 cm; N/S was also higher in mean weight diameter(MWD) of water-stable aggregates than S/C and C/N treatments at 0-30 cm. The fractal dimension of aggregates among these treatments were significantly different at 10-30 cm by dry sieving and at 0-10 cm by wet sieving, its value under N/S was lower than S/C and C/N treatments.[Conclusion] The three different rotational tillage patterns had no significant difference in soil bulk density. N/S conservation rotational tillage pattern increased soil macro-aggregate content and stability, improved dryland soil structure. S/C and C/N rotational tillage patterns disturbed soil layer because of every other year plowing, so its soil structure had no significant improvement.关键词
轮耕/保护性耕作/旱作麦田/土壤容重/土壤团聚体/平均重量直径/分形维数Key words
rotational tillage/conservation tillage/rainfed wheat field/soil bulk density/soil aggregate/mean weight diameter (MWD)/fractal dimension引用本文复制引用
程科,李军,毛红玲..不同轮耕模式对黄土高原旱作麦田土壤物理性状的影响[J].中国农业科学,2013,(18):3800-3808,9.基金项目
国家公益性行业（农业）专项（201303104）、国家科技支撑计划项目（2006BAD29B03）、国家自然科学基金项目 （）
