Interaction between soil and fertiliser nitrogen drives plant nitrogen uptake and nitrous oxide (N2O) emissions in tropical sugarcane systems,Plant and Soil

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Interaction between soil and fertiliser nitrogen drives plant nitrogen uptake and nitrous oxide (N2O) emissions in tropical sugarcane systems
Plant and Soil ( IF 3.9 ) Pub Date : 2022-05-04 , DOI: 10.1007/s11104-022-05458-6
Naoya Takeda ₁ , Johannes Friedl ₁ , Robert Kirkby ₁ , David Rowlings ₁ , Daniele De Rosa _{1,

2} , Clemens Scheer _{1,

3} , Peter Grace ₁

Affiliation

Aims

High nitrogen (N) fertiliser inputs in intensive sugarcane systems drive productivity but also significant emissions of nitrous oxide (N₂O), a potent greenhouse gas. Fertiliser and soil N availability for both plant N uptake and N₂O emissions across different N rates remain unknown, hindering efficient N management. This study investigated the contribution of fertiliser and soil N and their interaction to plant N uptake and N₂O emissions in two intensively managed tropical sugarcane systems.

Methods

High temporal resolution N₂O measurements were combined with ¹⁵N recoveries across four N fertiliser rates, (100, 150, 200 and 250 kg N ha^− 1) in soil, plant and N₂O emissions.

Results

Cumulative N₂O emissions ranged from 0.3 to 4.1 kg N ha^− 1, corresponding to emission factors ranging from 0.7 to 2.4%. Native soil N accounted for > 60% of cumulative N₂O emissions and total plant N uptake. Fertiliser N addition increased N₂O emissions from native soil N compared to the unfertilised control, highlighting the interaction between fertiliser and soil N, which determined the overall magnitude but also the response of total N₂O emissions to N rates dependent on the site conditions. Overall fertiliser ¹⁵N loss responded exponentially to N rates with 50% of applied N fertiliser permanently lost even at the recommended N rate.

Conclusions

The interaction between fertiliser and soil N and its contribution to N uptake and N₂O emissions demonstrate the importance of integrating soil fertility management with N fertiliser rate recommendations for sugarcane systems to maintain crop productivity and reduce environmental impacts.

中文翻译：

土壤和肥料氮之间的相互作用推动热带甘蔗系统中植物的氮吸收和一氧化二氮 (N2O) 排放

目标

集约化甘蔗系统中的高氮 (N) 肥料投入可提高生产力，但也会大量排放强效温室气体一氧化二氮 (N ₂ O)。不同氮素速率下植物氮吸收和 N _{2 O 排放的肥料和土壤氮可用性仍然未知，这阻碍了有效的氮管理。}本研究调查了两个集约化管理的热带甘蔗系统中肥料和土壤 N 的贡献及其对植物 N 吸收和 N ₂ O 排放的相互作用。

方法

高时间分辨率 N ₂ O 测量与土壤、植物和 N ₂ O 排放中四种 N 施肥率（100、150、200 和 250 kg N ha ^{- 1 ）的}^{15 N 回收率相结合。}

结果

累积 N ₂ O 排放范围为 0.3 至 4.1 kg N ha ^{- 1}，对应的排放因子范围为 0.7 至 2.4%。原生土壤氮占累积 N ₂ O 排放和植物总氮吸收的 60% 以上。与未施肥的对照相比，施肥 N 增加了天然土壤 N 的 N ₂ O 排放，突出了肥料和土壤 N 之间的相互作用，这决定了总 N ₂ O 排放量对 N 速率的响应，具体取决于场地条件. 总体施肥¹⁵ N 损失对 N 比率呈指数响应，即使在推荐的 N 比率下，也有 50% 的施用 N 肥料永久损失。