Soil-atmosphere exchange of nitrous oxide in two Tanzanian croplands: Effects of nitrogen and stover management

Zheng, Jinsen; Qu, Yanghua; Kilasara, Method; Mmari, William N.; Funakawa, Shinya

doi:10.1016/j.agrformet.2019.05.009

Cited by 14 publications

(20 citation statements)

References 66 publications

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“…Even if this threshold appears insufficient to trigger a denitrification process, it seems that another kind of N 2 O production and emission processes are taking place in such dry ecosystems and support this modification. Zheng et al (2019) also measured N 2 O emissions ranging from 0 to 14 ngN m −2 s −1 at two Tanzanian croplands, even though the WFPS was always below 40% [4]. As shown in Section 4.2., the pulse effect of N 2 O emissions after rainfall and the increase of denitrification potential with the climate aridity [21,22] support the modifications of the code to be able to simulate N 2 O emissions for semi-arid regions.…”

Section: Dndc Denitrification Module Adaptation To Semi-arid Conditionsmentioning

confidence: 82%

“…Nitrous oxide (N 2 O) is a powerful and long-lived greenhouse gas (GHG) with a high global warming potential [1,2], and it contributes to stratospheric ozone (O 3 ) depletion [3]. Atmospheric N 2 O concentrations have increased since around 1960 mainly due to intensive use of synthetic nitrogen (N) fertilisers, thus leading to enhanced N 2 O emissions from soils [4,5]. The formation of N 2 O in soils is due to multiple biological and physical-chemical processes such as nitrification, denitrification, nitrifier-denitrification, chemo-denitrification, chemical decomposition of hydroxylamine and co-denitrification with nitric oxide (NO) [2].…”

Section: Introductionmentioning

confidence: 99%

“…N 2 O emission reduction is considered as a way to mitigate climate change, in particular in the agricultural sector [32], but assessing the weight of N 2 O emissions from African crops in the global N 2 O emission burden is very difficult. Kim et al (2015) made a synthesis of available data on GHG emissions (CO 2 , CH 4 and N 2 O) from natural ecosystems and agricultural lands in SSA and reported considerable research gaps for the continent, an observation shared by Pelster et al (2017) and Leitner et al (2020) [25,29,30].…”

Section: Introductionmentioning

confidence: 99%

“…The Mbita soil NH4 + and NO 3 − contents between 0 and 20 cm were generally higher in November than in January (TableA2). Among the different plots, soil NH 4 + content varied from 1.5 ± 0.2 mgN kg soil −1 (Sorghum) to 4.8 ± 0.5 mgN kg soil −1 (Tea Field Kaptumo) during the January campaign, with an average of 2.9 ± 1.2 mgN kg soil −1 for all plots, and from 1.6 mgN kg soil −1 (Tea Field Kaptumo) to 11.3 mgN kg soil −1 (Maize Fort Ternan) during the November campaign, with an average of 5.9 mgN kg soil −1 for all plots.…”

mentioning

confidence: 96%

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Understanding N2O Emissions in African Ecosystems: Assessments from a Semi-Arid Savanna Grassland in Senegal and Sub-Tropical Agricultural Fields in Kenya

et al. 2020

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This study is based on the analysis of field-measured nitrous oxide (N2O) emissions from a Sahelian semi-arid grassland site in Senegal (Dahra), tropical humid agricultural plots in Kenya (Mbita region) and simulations using a 1D model designed for semi arid ecosystems in Dahra. This study aims at improving present knowledge and inventories of N2O emissions from the African continent. N2O emissions were larger at the agricultural sites in the Mbita region (range: 0.0 ± 0.0 to 42.1 ± 10.7 ngN m−2 s−1) than at the Dahra site (range: 0.3 ± 0 to 7.4 ± 6.5 ngN m−2 s−1). Soil water and nitrate (NO3−) contents appeared to be the most important drivers of N2O emissions in Dahra at the seasonal scale in both regions. The seasonal pattern of modelled N2O emissions is well represented, though the model performed better during the rainy season than between the rainy and dry seasons. This study highlighted that the water-filled pore space threshold recognised as a trigger for N2O emissions should be reconsidered for semi-arid ecosystems. Based on both measurements and simulated results, an annual N2O budget was estimated for African savanna/grassland and agricultural land ranging between 0.17–0.26 and 1.15–1.20 TgN per year, respectively.

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Section: Dndc Denitrification Module Adaptation To Semi-arid Conditionsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 96%

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Understanding N2O Emissions in African Ecosystems: Assessments from a Semi-Arid Savanna Grassland in Senegal and Sub-Tropical Agricultural Fields in Kenya

et al. 2020

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“…A reference gas containing 996 ppmv CO 2 in N 2 was injected several times during each measurement to guarantee precise calibration. The manual injection procedure and other instrument settings (including oven temperature and water vapor removal from the gas samples) can be found in Zheng et al (2019b).…”

Section: Gas Sampling and Analysismentioning

confidence: 99%

Microbial immobilization of ammonium and nitrate fertilizers induced by starch and cellulose in an agricultural soil

Zheng

Watanabe

et al. 2020

Soil Science and Plant Nutrition

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Combined applications of plant residues and nitrogen (N) fertilizer in agroecosystems may increase N immobilization and reduce N loss through microbial propagation using fresh organic matter (FOM). However, the effects of different carbon (C) availabilities in FOM to microbes on the immobilization of two forms of fertilizer-N (NH 4 + -N and NO 3 − -N) are still not clear. In this study, starch (high availability) and cellulose (low availability) were used to represent different polysaccharides in crop residues, and their effects on the immobilization of two forms of fertilizer-N (NH 4 + -N and NO 3 − -N) were investigated. Following the additions of polysaccharides and 15 N (99.9 atom %) (2.1 g C kg −1 soil and 100 mg N kg −1 soil), we measured soil respiration and traced immobilized fertilizer-N over 48 days. The starch addition quickly depleted mineral N (on day 3) while cellulose caused a slow but continuous immobilization for 4 weeks. Despite the same amount of C and N input, the maximum fertilizer-N immobilization in the cellulose treatment was lower than in the starch treatment and accounted for 56% and 40% of added N for NH 4 + -N and NO 3 − -N forms, respectively. NH 4 + -N was preferentially immobilized over NO 3 − -N in the cellulose treatment during incubation, but it also occurred in the starch treatment when mineral N was sufficient. Our results suggest that it was not the abundance of C, but rather the availability of C to microbes, that strongly determined the rate and capacity of fertilizer-N immobilization. Further, the preferential immobilization of NH 4 + -N highlighted that the use of ammonium-based fertilizer can increase the level of fertilizer-N immobilization.

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Fungal communities are more sensitive to nitrogen fertilization than bacteria in different spatial structures of silage maize under short-term nitrogen fertilization

Bai

Zhang

et al. 2022

Applied Soil Ecology

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Soil-atmosphere exchange of nitrous oxide in two Tanzanian croplands: Effects of nitrogen and stover management

Cited by 14 publications

References 66 publications

Understanding N2O Emissions in African Ecosystems: Assessments from a Semi-Arid Savanna Grassland in Senegal and Sub-Tropical Agricultural Fields in Kenya

Understanding N2O Emissions in African Ecosystems: Assessments from a Semi-Arid Savanna Grassland in Senegal and Sub-Tropical Agricultural Fields in Kenya

Microbial immobilization of ammonium and nitrate fertilizers induced by starch and cellulose in an agricultural soil

Fungal communities are more sensitive to nitrogen fertilization than bacteria in different spatial structures of silage maize under short-term nitrogen fertilization

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