| 白璐,蒋福祯,曹卫东,李正鹏,严清彪,韩梅.麦后复种绿肥对土壤有机碳及其固持特征的影响[J].干旱地区农业研究,2021,39(4):148~154 |
| 麦后复种绿肥对土壤有机碳及其固持特征的影响 |
| Effects of multiple cropping of green manure after wheat on soil organic carbon and its sequestration characteristics |
| |
| DOI：10.7606/j.issn.1000-7601.2021.04.19 |
| 中文关键词: 绿肥 有机碳 土壤团聚体有机碳 富集系数 贡献率 |
| 英文关键词:green manure organic carbon soil aggregate organic carbon enrichment factor contribution rate |
| 基金项目:财政部和农业农村部：国家现代农业产业技术体系项目（CARS-22）；青海省农科院基金项目（2019-NKY-6） |
|
| 摘要点击次数: 701 |
| 全文下载次数: 183 |
| 中文摘要: |
| 设置不同减施化肥+绿肥处理，分析麦后复种毛叶苕子对土壤有机碳、土壤团聚体有机碳含量、分布、富集系数及贡献率的影响。结果表明：土壤有机碳含量在小麦不同生育期存在差异，复种毛叶苕子后土壤有机碳含量显著增加，绿肥初花期土壤有机碳含量较绿肥播种前提高了11.3%；不同减施化肥+绿肥处理团聚体有机碳含量与团聚体粒级分布有差异，随着团聚体粒级的增大其含量呈升高趋势，＞5 mm粒级占比最大，其中F70+G处理团聚体有机碳含量最高,由小麦收获期的16.17 g·kg-1增加到绿肥初花期的17.35 g·kg-1；所有土壤团聚体有机碳含量富集系数集中在0.83～1.58，随着粒级的减小呈增大趋势，在1～3 mm粒级中，除绿肥初花期F100处理，其他处理富集系数均大于1，处于优先积累状态。＞0.5 mm粒级的贡献率最大，占80%以上，且不同处理之间差异显著，而1～3 mm 粒级贡献率最小。复种毛叶苕子后会使土壤有机碳含量、团聚体有机碳含量及富集系数增加，同时促进了团聚体有机碳的分布及固持。 |
| 英文摘要: |
| The effects of intercropping Viciavillosa with green manure after wheat on the distribution and fixation of soil organic carbon in Qinghai Plateau were studied. The effects of multiple cropping of Viciavillosa on soil organic carbon, soil aggregate, organic carbon content, distribution, enrichment coefficient and contribution rate were analyzed. The results showed that the content of soil organic carbon changed with the growth period of wheat, and the content of soil organic carbon increased significantly after multiple cropping of Viciavillosa, The content of soil organic carbon increased by 11.3% at the initial flowering stage; The content of organic carbon and the distribution of water stable aggregates were affected by the combination of vetch and chemical fertilizer, With the increase of particle size, the proportion of >5 mm particle size was the largest, and the carbon content of F70+G treatment was the highest, which increased from 16.17 g·kg-1 to 17.35 g·kg-1 at initial flowering stage; The enrichment factors of organic carbon content of aggregates in all treatments ranged from 0.83 to 1.58, and increased with the decrease of particle size, In the 1~3 mm grain size fraction, except for F100 treatment in turn over stage, the enrichment factors of other treatments were all greater than 1, and 8 was in the preferential accumulation state.The contribution rate of >0.5 mm particle size is the largest, accounting for more than 80%,Among them, the contribution rate of >5 mm was the largest, while that of 1~3 mm was the smallest.Soil organic carbon content,aggregate organic carboncontent and enrichment factor increased after multiple cropping of Viciavillosa. At the same time, it promotes the distribution and fixation of organic carbon in water stable aggregates. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |