中国农业科学 ›› 2025, Vol. 58 ›› Issue (1): 101-116.doi: 10.3864/j.issn.0578-1752.2025.01.008

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

有机肥替代化肥与丛枝菌根真菌互作对砂姜黑土和潮土N2O排放的影响

杜嘉琪1(), 张紫薇1, 王若飞1, 黎星1, 郭红艳2, 杨硕1, 冯成1, 何堂庆1, Giri Bhoopander3, 张学林1,*()   

  1. 1 河南农业大学农学院/省部共建小麦玉米作物学国家重点实验室/教育部作物生长发育调控重点实验室,中国郑州 450046
    2 商丘市经济作物技术推广中心,中国河南商丘 476000
    3 印度德里大学Swami Shraddhanand学院植物系,印度德里 110021
  • 收稿日期:2024-01-11 接受日期:2024-03-11 出版日期:2025-01-01 发布日期:2025-01-07
  • 通信作者:
    张学林,E-mail:
  • 联系方式: 杜嘉琪,E-mail:438905552@qq.com。
  • 基金资助:
    国家自然科学基金面上项目(32371633); 河南农业大学科技创新基金(30500712)

The Interactive Effects of Organic Fertilizer Substituting Chemical Fertilizers and Arbuscular Mycorrhizal Fungi on Soil Nitrous Oxide Emission in Shajiang Black Soil and Fluvo-Aquic Soil

DU JiaQi1(), ZHANG ZiWei1, WANG RuoFei1, LI Xing1, GUO HongYan2, YANG Shuo1, FENG Cheng1, HE TangQing1, Giri Bhoopander3, ZHANG XueLin1,*()   

  1. 1 College of Agronomy, Henan Agricultural University/State Key Laboratory of Wheat and Maize Crop Science/Key Laboratory of Crop Growth and Development Regulation, Ministry of Education, Zhengzhou 450046, China
    2 Shangqiu Economic Crop Technology Promotion Center, Shangqiu 476000, Henan, China
    3 Department of Botany, Swami Shraddhanand College, University of Delhi, Delhi 110021, India
  • Received:2024-01-11 Accepted:2024-03-11 Published:2025-01-01 Online:2025-01-07

摘要:

【背景】有机肥替代化肥(organic fertilizer substitution:OF)是一种有效的农田化肥减量策略,可以改变土壤有机碳与无机氮的比例,调节土壤氧化亚氮(N2O)排放。丛枝菌根真菌(arbuscular mycorrhizal fungi, AMF)通过与大多数陆生植物共生增加植物对土壤养分的吸收,调控N2O排放。【目的】探索不同土壤类型有机肥替代化肥比例及其与丛枝菌根真菌互作对土壤N2O排放的影响,分析其作用机制,为农田化肥减施提供技术支撑。【方法】选用砂姜黑土和潮土两种土壤类型,在玉米生育期设置有机肥替代化肥(仅施化学氮肥180 kg N·hm-2,0%OF;等氮有机肥替代25%化学氮肥,25%OF;等氮有机肥替代50%化学氮肥,50%OF)和AMF(不接种丛枝菌根真菌:M-;接种丛枝菌根真菌:M+)双因素试验,并设不施肥对照(CK),于玉米生育期测定植株生物量、氮素累积量、籽粒产量、土壤无机氮和N2O排放通量,同时测定砂姜黑土反硝化相关功能基因nirK和nirS的丰度。【结果】砂姜黑土上有机肥替代化肥不同比例之间玉米产量无显著差异,而潮土的玉米产量随替代比例增加呈降低趋势。与0%OF处理相比,砂姜黑土25%OF和50%OF处理N2O累积排放量分别减少17.6%和18%;而潮土分别减少13.5%和3.9%。与M-相比,M+处理能够增加玉米籽粒硝酸还原酶、亚硝酸还原酶、谷氨酰胺合成酶、谷氨酸合成酶和籽粒产量,同时减少N2O排放量,砂姜黑土N2O累积排放量减少26.5%—28.2%,潮土减少2.7%—13.5%,其中砂姜黑土和潮土的25%OFM+处理N2O累积排放量分别减少34.6%和22.5%,而根系总长度、根系表面积、根体积、根直径均显著增加。相关分析表明,砂姜黑土和潮土N2O排放均与土壤NH4+-N、NO3--N呈正相关,与AMF侵染率呈负相关;砂姜黑土N2O排放与nirK和nirS基因拷贝数呈正相关。【结论】不同土壤类型有机肥替代化肥并接种AMF均能降低N2O排放,这种影响主要通过AMF侵染扩大玉米根系氮素吸收范围和调控土壤反硝化关键功能微生物表达而实现。其中有机肥替代 25%化肥(25%OF)并接种AMF是实现玉米稳产、减肥、减排较为合理的施肥方式。

关键词: N2O排放, 有机肥替代, 丛枝菌根真菌, 反硝化微生物, 砂姜黑土, 潮土

Abstract:

【Background】Organic fertilizer substitution (OF) is an effective chemical fertilizer reduction strategy, which can change the ratio of soil organic carbon to inorganic nitrogen (N), so as to regulate nitrous oxide (N2O) emission. Similarly, arbuscular mycorrhizal fungi (AMF) forms a symbiotic strategy with most terrestrial plants, increases plant soil nutrient uptake, and affects soil N2O emission. However, the interactive effects of both OF and AMF on soil N2O emissions are poorly understood, especially in different agricultural soil environments, and the mechanism of their interaction is also unclear. 【Objective】 This study aimed to explore the mechanical effects of both OF and AMF on soil N2O emissions during maize growth periods in different soil types, so as to provide the appropriate methods to reduce chemical fertilizer application for farmland management.【Method】Taking Shajiang black soil (SJ) and Fluvo-aquic soils (CT) as research object, a two factor experiment with organic fertilizers replacing chemical fertilizers (0%OF: only chemical N fertilizer; 25%OF: equal N organic fertilizer replacing 25% chemical N fertilizer; 50%OF: equal N organic fertilizer replacing 50% chemical N fertilizer) and AMF (M+, inoculation of arbuscular mycorrhizal fungi; M-, no inoculation of arbuscular mycorrhizal fungi) was carried out in 2020, with a non-fertilization control (CK). The maize biomass, N accumulation, grain yield, soil inorganic N, and soil N2O emission flux were measured during maize growth period in both the soil types, and a relative abundance of denitrification functional genes, such as nirK and nirS, was investigated too. 【Result】There was no significant difference in maize grain yield among different OF treatments under the conditions of Shajiang black soil, while grain yield showed decreasing tendency with the OFS ratio increasing in Fluvo-aquic soils. Compared with 0%OF treatment, the cumulative N2O emissions under 25%OF and 50%OF treatments in Shajiang black soil reduced by 17.6% and 18%, respectively, and by 13.5% and 3.9% in the Fluvo-aquic soil. Compared with non-AMF (M-treatment), the presence of AMF (M+ treatment) increased maize grain nitrate reductase, nitrite reductase, glutamine synthase, glutamate synthase, and maize grain yield, while reduced soil N2O emissions. The reduction of cumulative N2O emissions in Shajiang black soil was by 26.5%-28.2%, and by 2.7%-13.5% in Fluvo-aquic soil; the reduction in case of 25% OFM+ treatment was 34.6% and 22.5% in Shajiang black soil and Fluvo-aquic soils respectively, while the root total length, root surface area, root volume and root diameter per plant increased significantly. Correlation analysis showed that N2O emissions were positively related with soil NH4+ and NO3- under both Shajiang black soil and Fluvo-aquic soil conditions, while negatively related with AMF infection rate in both Shajiang black and Fluvo-aquic soils; whereas, the emissions were positively related with the copy numbers of nirK and nirS genes under Shajiang black soil conditions.【Conclusion】The replacing chemical fertilizers with organic fertilizers and inoculation with AMF could reduce N2O emissions under different soil types. This interactive effect might be the result of expanding root N absorption area through AMF colonization, and by regulating the expression of key functional microorganisms in soil denitrification. Therefore, the study recommends replacement of 25% chemical fertilizer (OF25%) with organic fertilizers and inoculation with AMF could be an ideal fertilizer management method to maintain maize production stable and reduce chemical fertilizer application rate and greenhouse gas emissions.

Key words: N2O emissions, organic fertilizer substitution, arbuscular mycorrhizal fungi, denitrifying microorganisms, Shajiang black soil, Fluvo-aguic soil