Effects of different straw returning methods on the soil acidification of dryland in low mountain and hilly areas of Liaodong
In order to clarify the impact of different maize straw returning methods on soil acidity properties,this study takes dryland soil under different straw returning methods in the low mountain and hilly areas of Liaodong as the research object.Four treatments were set up,including control(CK),direct straw return(ZH),cow manure return(GH),and plant ash return after straw incineration(FH).By measuring soil pH,exchangeable acid,base saturation,acid damage capacity,and acid damage intensity,the effect of different straw returning methods on soil acidity in the low mountain and hilly areas of Liaodong was discussed.The results showed that FH treatment significantly increased soil pH and conductivity,and reduced soil exchangeable acid content and exchangeable aluminum content in exchangeable acids;ZH and GH treatments significantly reduced the content of exchangeable aluminum in soil and its proportion in exchangeable acids.ZH and GH treatments significantly increased soil cation exchange capacity(CEC)by 6.07% and 11.28%,respectively,compared to the CK treatment.However,there was no significant difference in CEC between the FH and CK treatments.The soil salinity saturation of ZH,GH,and FH treatments were 69.65%,68.88%,and 69.76%,respectively,which were higher than 66.36% of the CK treatment,but did not reach a significant level of 5% difference.The different straw returning methods significantly increased the soil's acid damage capacity and soil's acid damage intensity.The soil acid damage capacity was ranked from high to low in GH,ZH,and FH treatments,with increases of 15.97%,13.69%,and 12.70%,respectively.The soil acid damage intensity of different treatments showed GH>ZH>FH>CK.In this study,although the maize straw returning methods were different,they all enhanced the soil's acid damage capacity and intensity,and improved the soil's acid buffering capacity.
万方数据
维普
