In order to explore the impact of returning corn straw to the field on soil organic carbon composition and yield in semi-arid areas, the long-term positioning experimental field of straw at Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences was used as the re-search object to analyze the content of soil particulate organic carbon,water-soluble organic carbon and corn yield under three treatments:CK (conventional planting),FM (straw burying and returning) and FG (straw covering and returning).The results showed that clay particles (<0.053 μm) had the highest organic carbon content in each soil layer under different treatments.The average organic carbon content of sand par-ticles (>0.250 μm) and clay particles (<0.053 μm) in the four soil layers treated with FM by 21.78％ and 20.51％,and FG increased by 25.87％ and 13.52％,respectively.FM treatment had the highest content of water-soluble organic carbon in each soil layer,with FM>FG>CK in the order of 0-10 and 10-20 cm soil layers.FM treatment increased by 22.73％ and 2.48％ compared to CK,while FG treatment increased by 38.25％ and 26.32％ compared to CK,respectively.In the soil layers of 20-30 cm and 30-40 cm,the content of water-soluble organic carbon in the soil was in the order of FM>CK>FG,with FG decreasing by 14.55％ and 9.41％,while FM treatment increased by 10.68％ and 17.85％. There was no significant difference in spike length,spike diameter and spike row number among different treatments.The order of grain number per spike was FM>FG>CK,and the order of grain water content was FG>CK>FM.The yield order was FM>FG>CK,with FM and FG treatments increasing production by 5.20％ and 3.20％,respectively,compared to CK.
关键词
半干旱地区/秸秆还田/颗粒有机碳/水溶性有机碳/产量
Key words
Semi-arid region/Returning straw to the field/Granular organic carbon/Water soluble organic carbon/Yield
维普
万方数据