论文部分内容阅读
在关中平原塿土(土垫旱耕人为土)上施用化肥的条件下,进行不同用量玉米秸秆直接还田(低秸9 375 kg.hm-2,中秸18 750 kg.hm-2,高秸37 500 kg.hm-2)、间接还田(厩肥,37 500 kg.hm-2)的长期定位试验21 a,观测和分析了耕层土壤有机碳的储量及氧化稳定性等的变化。结果显示,与单施化肥相比,秸秆直接或间接还田均可显著提高土壤有机碳含量,耕层土壤有机碳储量分别增加了12%(低秸)、24%(中秸)、41%(高秸)和39%(厩肥)。施用秸秆和厩肥21 a,土壤有机碳累积系数平均分别为5.6%和7.2%。秸秆直接还田和厩肥均使土壤有机碳的氧化稳定性降低,胡敏酸的能态升高且保持相对稳定。以上结果表明,秸秆直接或间接还田不仅能显著提高土壤有机碳储量,也能明显改善土壤有机碳的活性和质量,是提高农田固碳能力、促进农业可持续性的重要措施。
In the Guanzhong plain soil (soil pad dry man-made soil) fertilizer on the conditions, the different amount of corn stalks directly into the field (low straw 9 375 kg.hm-2, straw 18 750 kg.hm-2, high Straw 37 500 kg.hm-2) and indirect re-entry (manure, 37 500 kg.hm-2) for 21 years. The changes of soil organic carbon storage and oxidation stability in topsoil were observed and analyzed. The results showed that soil organic carbon content increased significantly by 12% (low straw), 24% (medium straw), 41% (High straw) and 39% (manure). The application of straw and manure 21 a, soil organic carbon cumulative coefficient averaged 5.6% and 7.2%. Direct straw returning and manure all decreased the oxidation stability of soil organic carbon, and the energy state of humic acid increased and remained relatively stable. The above results show that the direct or indirect return of straw can not only significantly increase soil organic carbon storage, but also significantly improve the activity and quality of soil organic carbon, which is an important measure to enhance the carbon sequestration capacity of farmland and promote agricultural sustainability.