不同轮作模式对潮土土壤物理性状的影响

Effects of Different Rotation Patterns on Soil Physical Properties of Fluvo Soil

为探究不同轮作模式对土壤结构的改良效果,于2018—2019年在山西大同进行田间试验,以荞麦—荞麦连作(BB)为对照,探讨了油菜—荞麦(RB)、玉米—荞麦(CB)、马铃薯—荞麦(PB)、燕麦—荞麦(OB)4种轮作模式下土壤容重、总孔隙度、毛管孔隙度和田间持水量的变化。结果表明,土壤容重随土层加深呈现出增加趋势,土壤总孔隙度、毛管孔隙度和田间持水量随土层加深而降低;各轮作模式(PB、OB除外)不同程度降低了0~40 cm土层土壤容重,增加了0~40 cm土层土壤总孔隙度、毛管孔隙度和田间持水量,以油菜—荞麦轮作模式最佳。整体而言,轮作有利于改善土壤结构,油菜—荞麦轮作效果最好,是该研究区较为理想的轮作模式。

To explore the effect of different rotation patterns on soil structure improvement,field experiments were carried out in Datong,Shanxi province from 2018 to 2019.Taking buckwheat-buckwheat(BB)continuous cultivation as a control,changes of soil bulk density,total porosity,capillary porosity and field capacity of four rotation patterns of rape-buckwheat(RB),corn-buckwheat(CB),potato-buckwheat(PB)and oat-buckwheat(OB)were studied.The results showed that the soil bulk density increased with the deepening of soil layer,and the total porosity of soil,capillary porosity and field capacity decreased with the deepening of soil layer.The bulk density of 0-40 cm soil layer(except for PB and OB treatment)reduced to different degrees in each rotation mode,while the total porosity,capillary porosity and field capacity of 0-40 cm soil layer increased.The rape-buckwheat rotation mode was the best.On the whole,rotation is conducive to improve soil structure,and rape-buckwheat rotation is the best,which is an ideal rotation mode in this study area.