Mitigating nitrogen loss in paddy field microcosms through indigenous arbuscular mycorrhizal fungi assemblage

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-09-03 DOI:10.1111/ejss.13572
Shujuan Zhang, Xinlong Chen, Yuexiao Dong, Jingfan Qi, Zhaoyang You
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Abstract

Whether farmers should consider the role of arbuscular mycorrhizal fungi (AMF) in agriculture is a hotly debated topic. We aimed to investigate the role of indigenous AMF in reducing nitrogen (N) loss from paddy fields via runoff, leaching, NH3 volatilization, and N2O emission. We conducted a pot experiment employing a mycorrhiza-defective rice mutant (non-mycorrhizal) as the control, grown in soil containing indigenous AMF. The corresponding AMF treatment used the progenitor of this mutant with the same soil. The plants were fertilized with nitrogen, phosphorus and potassium 6 weeks after sowing. The root colonization was 23% in mycorrhizal rice, and no typical AMF structures were observed in the roots of non-mycorrhizal rice. Our findings indicated that the mycorrhizal system exhibited lower N concentrations of runoff and leachate further compounded by reduced fluxes of N2O and NH3. This led to 14% decrease (mycorrhizal rice 111 kg N ha−1; the non-mycorrhizal rice: 129 kg N ha−1) in cumulative N loss within 3 days post-fertilization. While this AMF effect was consistent across the four tested N loss pathways, differences were observed between NH4+-N and NO3-N in the runoff pathway. Notably, our results revealed no evidence of trade-offs in AMF effect on N loss among the tested pathways. Additionally, mycorrhizal rice had larger shoots and roots than their non-mycorrhizal counterparts. Our study underscores the potential benefits of indigenous AMF in paddy fields for mitigating water pollution and reducing greenhouse gas emission.

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通过本地丛枝菌根真菌群减轻稻田微生态系统的氮损失
农民是否应该考虑丛枝菌根真菌(AMF)在农业中的作用是一个备受争议的话题。我们的目的是研究本地菌根真菌在减少水稻田通过径流、淋洗、NH3挥发和N2O排放造成的氮损失方面的作用。我们采用菌根缺陷水稻突变体(无菌根)作为对照,在含有本地 AMF 的土壤中进行了盆栽实验。相应的 AMF 处理使用该突变体的原种和相同的土壤。播种 6 周后,对植株施以氮、磷和钾肥。菌根水稻根部定殖率为 23%,而非菌根水稻根部未观察到典型的 AMF 结构。我们的研究结果表明,菌根系统的径流和沥滤液中的氮浓度较低,同时 N2O 和 NH3 的通量也有所减少。这导致施肥后 3 天内的累积氮损失减少了 14%(菌根水稻:111 千克氮公顷-1;非菌根水稻:129 千克氮公顷-1)。虽然 AMF 对四种测试氮损失途径的影响是一致的,但在径流途径中,NH4+-N 和 NO3--N 之间存在差异。值得注意的是,我们的结果表明,在所测试的途径中,AMF 对氮损失的影响没有权衡的迹象。此外,菌根水稻的芽和根比非菌根水稻大。我们的研究强调了本土 AMF 在减轻水污染和减少温室气体排放方面的潜在益处。
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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
期刊最新文献
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