Fate of urea-<sup>15</sup>N as influenced by different irrigation modes

Xu, Ran; Chen, Jingnan; Zhifang, Lin; Xieyong, Chen; Ming, Hou; Shen, S. C.; Jin, Qiu; Zhong, Fenglin

doi:10.1039/d0ra00002g

Cited by 7 publications

(3 citation statements)

References 23 publications

(52 reference statements)

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“…In this study, the participation of p. chinense ‘s litter in decomposition led to higher organic matter content in all soil layers of Q-P type compared to Q type, consequently immobilizing more nitrogen. The residual 15 N in both forest types exhibited a decreasing trend with increasing soil depth, consistent with previous reports ( Ru et al., 2020 ; Nguyen et al., 2021 ; Effah et al., 2022 ).…”

Section: Discussionsupporting

confidence: 92%

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

Wu,

Dong,

Zhong

et al. 2024

Front. Plant Sci.

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ObjectivesBamboo is a globally significant plant with ecological, environmental, and economic bene-fits. Choosing suitable native tree species for mixed planting in bamboo forests is an effective measure for achieving both ecological and economic benefits of bamboo forests. However, little is currently known about the impact of bamboo forests on nitrogen cycling and utilization efficiency after mixing with other tree species. Therefore, our study aims to compare the nitrogen cycling in pure bamboo forests with that in mixed forests.MethodsThrough field experiments, we investigated pure Qiongzhuea tumidinoda forests and Q. tumidinoda-Phellodendron chinense mixed forests, and utilized 15N tracing technology to explore the fertilization effects and fate of urea-15N in different forest stands.ResultsThe results demonstrated the following: 1) in both forest stands, bamboo culms account for the highest biomass percentage (42.99%-51.86%), while the leaves exhibited the highest nitrogen concentration and total nitrogen uptake (39.25%-44.52%/29.51%-33.21%, respectively) Additionally, the average nitrogen uptake rate of one-year-old bamboo is higher (0.25 mg kg-1 a-1) compared to other age groups. 2) the urea-15N absorption in mixed forests (1066.51–1141.61 g ha-1, including 949.65–1000.07 g ha-1 for bamboo and 116.86–141.54 g ha-1 for trees) was significantly higher than that in pure forests (663.93–727.62 g ha-1, P<0.05). Additionally, the 15N recovery efficiency of culms, branches, leaves, stumps, and stump roots in mixed forests was significantly higher than that in pure forests, with increases of 43.14%, 69.09%, 36.84%, 51.63%, 69.18%, 34.60%, and 26.89%, respectively. 3) the recovery efficiency of urea-15N in mixed forests (45.81%, comprising 40.43% for bamboo and 5.38% for trees) and the residual urea-15N recovery rate in the 0–60 cm soil layer (23.46%) are significantly higher compared to those in pure forests (28.61%/18.89%). This could be attributed to the nitrogen losses in mixed forests (30.73%, including losses from ammonia volatilization, runoff, leaching, and nitrification-denitrification) being significantly lower than those in pure forests (52.50%).ConclusionThese findings suggest that compared to pure bamboo forests, bamboo in mixed forests exhibits higher nitrogen recovery efficiency, particularly with one-year-old bamboo playing a crucial role.

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Section: Discussionsupporting

confidence: 92%

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

Wu,

Dong,

Zhong

et al. 2024

Front. Plant Sci.

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“…The nitrification and denitrification processes dominated by soil microorganisms are influenced, this finally impacting N 2 O and NO emissions [14] . Moreover, different irrigation modes lead to different water and N distributions in the surface and profile soil, and have different effects on the leaching and mineralization of soil N [15][16][17] , which will inevitably change the amount and location of available N in surface soil. Available N in surface soil is an important substrate responsible for N 2 O and NO emissions [18] .…”

Section: Introductionmentioning

confidence: 99%

NxO emissions in response to the irrigation lower limits under different irrigation modes in a lettuce field

Hou,

Xiao,

Zhu

et al. 2023

International Journal of Agricultural and Biological Engineering

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Irrigation has a significant impact on N x O (N 2 O and NO) emissions from cultivated land, yet the N 2 O or NO emission among the irrigation lower limits under different irrigation modes has not been well compared. In an irrigated lettuce field, three DR (drip irrigation) lower limits were designed, including 75% (DR1), 65% (DR2) and 55% (DR3) field capacity, and one FI (furrow irrigation) lower limit (65% field capacity). The N 2 O and NO emission fluxes and soil nitrogen (N) forms were determined, and the linear correlation between these indicators was analyzed. Results showed that under the same irrigation regime, the N 2 O and NO emissions from furrow irrigation treatment increased by 36.8% and 45.2% respectively compared to that from drip irrigation treatment. The cumulative N 2 O and NO emissions under DR3 were 30.2% and 28.6% higher than under DR1, respectively. Moreover, DR1 was also the lowest among the four treatments in soil -N concentration. The N 2 O and NO emission fluxes were more correlated to soil -N (r=0.88 and 0.76) or -N (r=0.90 and 0.80) concentration than soil -N and soluble organic N, indicating that N 2 O and NO were mainly produced by the soil nitrification process. When the irrigation regime was the same, N 2 O and NO emissions were lower with drip irrigation than with furrow irrigation. Besides, drip irrigation with small quota but high frequency reduced N 2 O and NO emission compared to that with large quota but low frequency.

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“…As one of the most widely used high-efficiency water-saving irrigation technologies, drip irrigation can deliver water evenly and quantitatively to the soil according to the water consumption of the root soil. On the one hand, it can promote crop growth and increase yield, and on the other hand, it can also effectively save water and improve fertilizer utilization [8][9][10]. However, the generated blockage of the emitter during the operation process restricts the safety and lifespan of drip irrigation systems.…”

Section: Introductionmentioning

confidence: 99%

Effect and Mechanism of Micro-Nano Aeration Treatment on a Drip Irrigation Emitter Based on Groundwater

Li,

Han,

Dong

et al. 2023

Agriculture

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The problem of emitter clogging has become the main obstacle restricting the application and promotion of drip irrigation technology. Studying the process of emitter clogging helps improve irrigation efficiency and save water resources. A large number of researchers have tried to solve the problem of emitter clogging from many perspectives. However, the influence of micro-nano bubbles as well as generated blockage on the clogging process of drip irrigation systems is less studied. Here, the influence of aeration on emitter clogging was studied by adding micro-nano bubbles to groundwater. Four different emitters were selected. Two treatments, micro-nano aeration and non-aeration, were set up, with a total of eight sets of experiments, running for 1500 h. The degree of emitter clogging was quantitatively characterized using the discharge ratio variation (Dra). The Christiansen uniformity coefficient (Cu) and statistical uniformity coefficient (Us) were used to evaluate the influence of emitter clogging on the performance of the drip irrigation system. Compared with the non-aeration treatment group, the Dra of aerated E1–E4 decreased by 64.74%, 54.22%, 64.20%, and 94.69% in 800 h, respectively. At the same time, the Us of the aerated E1–E4 decreased by 100%, 60.05%, 92.32%, and 100%, while the Cu of aerated E1–E4 decreased by 76.64%, 53.79%, 74.11%, and 100% compared with the unaerated group. The Cu and Us of all emitters under the aeration treatment were smaller than those comparison group. As for the blockage, the main components were typical physical blockage SiO2 and chemical blockage CaCO3. Most of the blockages in the non-aeration treatment group are 5–10 μm in length, while those in the aerated treatment group were generally less than 5 μm. Aeration treatment made the blockage more broken and dense and more likely to accumulate in the flow channel, obstructing the flow of water and thus intensifying the clogging process. As a result, micro-nano aeration treatment increased the risk of emitter clogging, accelerated the development of blockage in the emitter, and disturbed the uniformity of the entire drip irrigation system. This study provides a reference idea for solving the problem of blockage in drip irrigation systems.

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Fate of urea-¹⁵N as influenced by different irrigation modes

Abstract: Fertilizer nitrogen (N) is a main pollutant in the agricultural ecosystem, while the fate of fertilizer N influenced by different irrigation modes is not well comparatively investigated.

Cited by 7 publications

References 23 publications

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

NxO emissions in response to the irrigation lower limits under different irrigation modes in a lettuce field

Effect and Mechanism of Micro-Nano Aeration Treatment on a Drip Irrigation Emitter Based on Groundwater

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Fate of urea-15N as influenced by different irrigation modes

Abstract: Fertilizer nitrogen (N) is a main pollutant in the agricultural ecosystem, while the fate of fertilizer N influenced by different irrigation modes is not well comparatively investigated.

Cited by 7 publications

References 23 publications

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

Comparative study of urea-15N fate in pure bamboo and bamboo-broadleaf mixed forests

NxO emissions in response to the irrigation lower limits under different irrigation modes in a lettuce field

Effect and Mechanism of Micro-Nano Aeration Treatment on a Drip Irrigation Emitter Based on Groundwater

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Fate of urea-¹⁵N as influenced by different irrigation modes