摘要
【目的】阐明灌溉和施氮管理对土壤结构稳定及土壤质量改善的重要性。【方法】设置施氮量为0、180 kg/hm^(2)共2个水平(下称:N_(0)和N_(180))以及充分灌溉(F)和非充分灌溉(S)2个灌溉水平,共4个处理,采用随机区组设计,研究施氮和灌溉对麦田土壤团聚体组成及有机碳影响。【结果】①非充分灌溉能够显著提升施氮土壤的水稳性大团聚体量。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量;施氮或非充分灌溉以及二者交互作用显著促进耕层(0~30 cm)土壤的有机碳累积。
【Objective】Aggregation is an important soil health indicator modulating many soil functions including nutrient bioavailability and carbon sequestration.It is affected by a multitude of factors.The purpose of this paper is to study the effect of irrigation and nitrogen fertilization on soil aggregation and soil organic carbon.【Method】The experiment was conducted in a winter wheat field.It consisted of two nitrogen applications:0(N_(0))and 180 kg/hm^(2)(N_(180)),two irrigation treatments:sufficient irrigation(F)and deficit irrigation using 65%of the water in F.In each treatments,we measured water-stable aggregates and soil organic carbon.【Result】①Deficit irrigation coupled with nitrogen fertilization increased water-stable macroaggregates with diameter≥0.25 mm.Nitrogen fertilization increased organic carbon in the top 0~30 cm soil layer by more than 3.59%when irrigation was the same,while deficit irrigation increased organic carbon in the same soil layer by more than 2.86%when nitrogen fertilization was the same.②Soil moisture directly affected soil carbon,explaining 83.9%of the change in total organic carbon,while nitrogen indirectly affected soil carbon,explaining 46.89%of change in the total organic carbon.③The direct impact of water-stable aggregates on soil carbon was negative,while its direct influence was positive.【Conclusion】The effect of nitrogen fertilization on soil aggregation was modulated by irrigation.Nitrogen fertilization combined with deficient irrigation boosted carbon accumulation in the topsoil.
作者
李彩霞
陈津赛
付媛媛
韩其晟
宁慧峰
王广帅
LI Caixia;CHEN Jinsai;FU Yuanyuan;HAN Qisheng;NING Huifeng;WANG Guangshuai(Institute of Farmland Irrigation,Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Water Demand and Regulation,Ministry of Agriculture and Rural Affairs,Xinxiang 453002,China;College of Agronomy,China Agricultural University,Beijing 100081,China;College of Plant Sciences,Tarim University,Alaer 843300,China)
出处
《灌溉排水学报》
CAS
CSCD
北大核心
2022年第12期59-64,80,共7页
Journal of Irrigation and Drainage
基金
中央级科研院所基本科研业务费项目(FIRI20210104)
国家自然科学基金项目(51879267)。
关键词
土壤团聚体
灌溉
氮肥
土壤有机碳
soil aggregates
irrigation
nitrogen fertilizer
soil organic carbon
