| 引用本文: | 李彩霞,陈津赛,付媛媛.施氮和灌溉管理对麦田土壤团聚体组成及有机碳的影响[J].灌溉排水学报,2022,(12):-. |
| 李彩霞,Chen Jinsai,fuyuanyuan.施氮和灌溉管理对麦田土壤团聚体组成及有机碳的影响[J].灌溉排水学报,2022,(12):-. |
|
| 摘要: |
| 【目的】为了阐明灌溉和施氮管理对土壤结构稳定及土壤质量水氮管理对土壤结构的影响，研究不同灌溉和施氮水平下土壤团聚体组成及有机碳含量改善的重要性。【方法】试验设置施氮量为0和180 kg/hm2 kg?hm^(-1)两个氮肥水平（下称：N0N_0和N180）以及充分灌溉（F）和非充分灌溉（S）两个灌溉水平，共4个处理，采用随机区组设计。【结果】（1）非充分灌溉能够显著提升施氮（N_180）土壤的水稳性大团聚体（≥0.25 mm）含量。施氮使土壤有机碳提升3.59%以上，非充分灌溉使土壤有机碳提升2.86%以上。；（2）土壤水直接影响土壤碳累积，其直接效应占有机碳总量的83.09%，而土壤氮对土壤碳累积以间接效应为主，其间接效应占有机碳总量的46.89%；（3）水稳性大团聚体对土壤碳累积的直接效应为负，但其间接效应为正。【结论】施氮对土壤团聚体组成的影响受灌溉水平的制约，灌溉及其与氮素交互作用显著影响水稳性大团聚体含量；施氮或非充分灌溉以及二者交互作用显著促进耕层（0~30cm）土壤的有机碳累积。 |
| 关键词: 土壤团聚体;灌溉;氮肥;土壤有机碳 |
| DOI： |
| 分类号:S274.3 |
| 基金项目: |
|
| Effects of nitrogen Nitrogen and irrigation Irrigation treatment Treatment on soil Soil aggregate Aggregate structure Structure and soil Soil organic Organic carbon Carbon in winter Winter wheat Wheat fieldField |
|
李彩霞1, Chen Jinsai2, fuyuanyuan3
|
|
1.Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Water Demand and Regulation, Ministry of Agriculture and Rural Affairs;2.College of Agronomy, China Agricultural University;3.College of Plant Sciences, Tarim University
|
| Abstract: |
| 【Objective】In order to reveal the impactions of water and nitrogen management on soil structure, the effects of different irrigation and nitrogen levels on soil aggregate comprise and soil organic carbon were investigated with a field experiment of winter wheatclarify the importance of irrigation and nitrogen application management to soil structure stability and soil quality improvement. 【Method】The random block design was introduced to this experiment with two nitrogen treatments, i.e., N0 and N180 (nitrogen rate was 0 and 180 kg?hm-1, respectively), and two irrigation levels, i.e., full irrigation (F) and deficit irrigation (irrigation amount was 65% of full irrigation), total of 4 treatments, used radom block design. 【Result】(1) The results showed that 65%deficit irrigation of full irrigation can significantly increased the content of water-stable macroaggregates (≥0.25 mm) in soil applied with nitrogen fertilizer (N_180). Nitrogen application increased soil organic carbon content by more than 3.59% in surface layer (0~30cm), while 65% full irrigation water decreased soil carbon accumulationand deficit irrigation increased soil organic carbon by more than 2.86%. (2) Soil moisture had a direct effect on soil carbon accumulation, accounting for 83.9% of total organic carbon, while soil nitrogen had an indirect effect on soil carbon accumulation, accounting for 46.89% of total organic carbon. (3) The direct effect of water-stable aggregates on soil carbon accumulation was negative, but its indirect effect was positive. 【Conclusion】The effect of nitrogen application on soil aggregate composition was restricted by irrigation level, irrigation and its interaction with nitrogen significantly affected the content of water-stable macroaggregates, Nitrogen application and irrigation level had no significant effect on soil organic carbon accumulation, however, nitrogen application under deficient irrigation can promote soil carbon accumulation in surface layer. |
| Key words: Soil aggregates; Irrigation; Nitrogen fertilizer; Soil organic carbon |
