Soil pore architecture and rhizosphere legacy define N2O production in root detritusphere

Kim, Kyungmin; Gil, Jenie; Ostrom, Nathaniel E.; Gandhi, Hasand; Oerther, Maxwell; Kuzyakov, Yakov; Guber, Andrey; Kravchenko, Alexandra

doi:10.1016/j.soilbio.2022.108565

Cited by 21 publications

(4 citation statements)

References 132 publications

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“…The differences in the chemical composition of the old roots of P. virgatum encountered in the switchgrass‐soil and of the old roots of a variety of unidentified plant species in the prairie‐soil were the likely important contributors to the observed difference in root decomposition of the two plants (Kim et al ., 2022). Yet, growth into the soil matrix and resultant greater root–soil contact also promoted microbial respiration (Fig.…”

Section: Discussionmentioning

confidence: 99%

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

et al. 2023

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Summary Plant roots are the main supplier of carbon (C) to the soil, the largest terrestrial C reservoir. Soil pore structure drives root growth, yet how it affects belowground C inputs remains a critical knowledge gap. By combining X‐ray computed tomography with 14C plant labelling, we identified root–soil contact as a previously unrecognised influence on belowground plant C allocations and on the fate of plant‐derived C in the soil. Greater contact with the surrounding soil, when the growing root encounters a pore structure dominated by small (< 40 μm Ø) pores, results in strong rhizodeposition but in areas of high microbial activity. The root system of Rudbeckia hirta revealed high plasticity and thus maintained high root–soil contact. This led to greater C inputs across a wide range of soil pore structures. The root–soil contact Panicum virgatum, a promising bioenergy feedstock crop, was sensitive to the encountered structure. Pore structure built by a polyculture, for example, restored prairie, can be particularly effective in promoting lateral root growth and thus root–soil contact and associated C benefits. The findings suggest that the interaction of pore structure with roots is an important, previously unrecognised, stimulus of soil C gains.

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Section: Discussionmentioning

confidence: 99%

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

et al. 2023

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“…Ding et al (2019) found that the net N 2 O emissions of sand particles in paddy soils were significantly greater than those of silt particles and clay particles. Other studies have also shown that macroporous soils lead to more N 2 O emissions than small-pore soils (Kim et al, 2022;Laudone et al, 2011), mainly because soil with different textures has different air permeability. The large particle size of sand is conducive to gas diffusion, and the retention time of N 2 O will be shortened, which is not conducive to the reduction process of N 2 O.…”

Section: Sandy Loamy Soils With Water Saturation Have Higher N 2 O Co...mentioning

confidence: 98%

N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Wang,

Li,

et al. 2024

Soil Science Soc of Amer J

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Sandy loamy soils are widely distributed in fluvial floodplains and experience flooding events frequently, resulting in a large amount of nitrous oxide (N2O) emissions. This case is more serious when the soil use is changed to paddies. It is of great significance to figure out the N2O consumption and its influencing factors in sandy loamy paddy soils to mitigate N2O emissions. In this study, three sandy loamy paddy soils (0–5 cm) originated from lake deposits were selected (S1, S2, and S3) as objectives. A certain concentration of exogenous N2O was added at the bottom of the flooded soil column to monitor the dynamics of N2O and nitrogen (N2) on the soil surface. Total N2O consumption, N2O uptake, and N2 production were quantified, and the abundance of nitrous oxide reductase genes (nosZI, and nosZII) and other soil properties (ammonium‐nitrogen, nitrate‐nitrogen, and dissolved organic carbon [DOC] content) were analyzed. The results showed that the sandy loamy paddy soil column with a depth of 0–5 cm could intercept more than 95% of the exogenous N2O under the flooded anaerobic condition, indicating that the three sandy loamy paddy soils all had extremely strong N2O consumption capacities. And the increment of N2 accounted for 68.73%–76.09% of the total N2O consumption, which had a stronger relationship with the increase of nosZI gene abundance than nosZII gene. In addition, the total N2O consumption and N2 increment of S1 and S3 soils were significantly higher than those of S2 soil. This difference was mainly related to soil organic matter content, total nitrogen content, DOC consumption, and the increase of nosZI gene abundance (p < 0.05). The strong N2O consumption potential of sandy loamy soils can provide feasible solutions for regulating N2O emissions in a wide range of similar environments in fluvial floodplains.

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“…The soil continuously received root exudates from dead fine roots. Therefore, the natural primary forest without fine roots and litter may lead to a slight increase in N2O emissions (Kim et al, 2022).…”

Section: Comparison Of Mineral and Peatland N2o Fluxes In The Peatlan...mentioning

confidence: 99%

Assessing N2O Emissions from Tropical Crop Cultivation in Mineral and Peatland Soils: A Review

Suwardi,

Darmawan,

Djajakirana

et al. 2023

Caraka Tani J. Sustain. Agric.

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Nitrous oxide (N2O) emissions from agricultural activities contribute significantly to global warming. Understanding the factors influencing N2O emissions is crucial for developing effective mitigation strategies. This review assesses N2O emissions from various crops cultivated in tropical mineral and peatland soils, providing insights into the impact of land use, fertilization practices and rainfall on N2O fluxes. Field measurements of N2O fluxes were conducted in agricultural fields growing corn, peanuts, and cassava in Bogor Regency, West Java Province, as well as in peatland areas with Acacia plantations and natural primary forests in Bengkalis Regency, Riau Province. The study assesses the total N2O fluxes for each crop and land type, revealing significant variations in N2O emissions among different crops and land uses. Peatland areas exhibit higher emissions compared to mineral soils, emphasizing the need for targeted mitigation measures in these ecosystems. The findings highlight the importance of considering the type and age of land use when evaluating N2O emissions. Land management practices, such as fertilizer use and soil disturbance, emerge as critical factors affecting N2O emissions. Improper fertilizer application and excessive soil disturbance can lead to increased N2O emissions, underscoring the necessity for careful N fertilizer management and conservation tillage techniques.

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Soil pore architecture and rhizosphere legacy define N2O production in root detritusphere

Cited by 21 publications

References 132 publications

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Assessing N2O Emissions from Tropical Crop Cultivation in Mineral and Peatland Soils: A Review

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Soil pore architecture and rhizosphere legacy define N2O production in root detritusphere

Cited by 21 publications

References 132 publications

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

The soil pore structure encountered by roots affects plant‐derived carbon inputs and fate

N2O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Assessing N2O Emissions from Tropical Crop Cultivation in Mineral and Peatland Soils: A Review

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N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils