论文部分内容阅读
通过多年定位试验,研究黄土高原丘陵沟壑区不同耕作制度和种植方式对坡耕地土壤团聚数量、分布和稳定性的影响。结果表明,不同耕作方式下,免耕覆盖处理和免耕处理可明显增加土壤中大团聚体的含量,免耕覆盖处理有着相对更高的团聚体稳定性,并且更易形成>5mm水稳性团聚体;不同种植方式下,处理对大团聚体含量影响差异不显著。在同一耕作方式下不同种植方式的土壤大团聚体含量变化趋势不同。相关分析表明,大团聚体含量为土壤团聚体平均重量直径(MWD)产生影响的主要因素,容重对土壤团聚体平均重量直径亦有影响,团聚体破坏率只对水稳团聚体平均重量直径有影响。
Through years of experiments, the effects of different tillage systems and planting methods on the quantity, distribution and stability of soil aggregates in sloping arable land in the hilly and gully regions of the Loess Plateau were studied. The results showed that no-tillage treatment and no-tillage treatment could significantly increase the content of macroaggregates in different tillage systems, and the no tillage treatment had a relatively higher stability of aggregates, and more easily formed> 5mm water-stable agglomeration Under different planting methods, the effect of treatment on the content of large aggregates was not significant. Under the same tillage mode, the content of soil macroaggregates varied with different planting methods. Correlation analysis showed that the content of macroaggregates was the main factor affecting the average weight diameter (MWD) of soil aggregates. The bulk density also had an impact on the average weight diameter of soil aggregates, and the aggregates destruction rate only affected the average weight diameter of water-stable aggregates influences.