深松与秸秆覆盖还田对半干旱区土壤碳组分和玉米产量的影响OA

In order to promote soil carbon sequestration and maize yield increase in the semi-arid region of western Heilongjiang Province,the long-term positioning experimental field of cultivation and straw at the Heilongjiang Academy of Agricultural Sciences was taken as the research object.The effects of CK(conventional planting),NFG(straw mulching and returning),and SFG(deep loosening+straw mulching and returning)treatments on soil organic carbon,different particle size organic carbon,water-soluble organic carbon content,and yield were analyzed,Study the effects of deep loosening and straw mulching on soil carbon composition and maize yield in semi-arid areas.The results indicate that:(1)The order of soil organic carbon and water-soluble organic carbon content in the 0-10 cm and 10-20 cm soil layers is SFG＞NFG＞CK.(2)In this experiment,the organic carbon content of clay particles(＜0.053 mm)was significantly higher than that of sand particles(＞0.250 mm)and silt particles(0.053-0.250 mm).(3)In the 0-10 cm soil layer,the organic carbon content of sand particles(＞0.250 mm),clay particles(＜0.053 mm),and silt particles(0.053-0.250 mm)treated with SFG and NFG increased by more than 10％ compared to the control CK.In the 10-20 cm soil layer,the organic carbon content of SFG treated sand particles(＞0.250 mm)and NFG treated powder particles(0.053-0.250 mm)increased significantly.(4)There was no significant difference in maize ear length,ear diameter,and ear row number among different treatments.The difference in grain number and yield per spike reached a significant level.Among them,SFG and NFG treatments increased the yield by 28.57％ and 15.10％ respectively compared to CK.There is a highly significant(P＜0.01)positive correlation between yield and soil organic carbon content,and a significant(P＜0.05)positive correlation with organic carbon and water-soluble organic carbon content of different particle sizes.