The effects of rice-straw biochar addition on nitrification activity and nitrous oxide emissions in two Oxisols

He, Lili; Zhao, Xu; Wang, Shenqiang; Xing, Guangxi

doi:10.1016/j.still.2016.05.006

Cited by 56 publications

(16 citation statements)

References 54 publications

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“…Numbers in brackets are standard error of the mean (n = 4) and lowercase letters indicate significant differences between the treatments at 95% confidence level WFPS -soil water filled pore space. There was a clear response of the observed N 2 O concentrations to the apple-tree biochar amendment rate and, compared to the CK treatment, ΔN 2 O in air/injected N 2 O was reduced to 5%, corroborating the results of other laboratory and short-term field investigations (Rogovska et al, 2011;Case et al, 2012;Wang et al, 2013;Lan et al, 2015;He et al, 2016;Grutzmacher et al, 2018). Although the previous studies observed a suppression of N 2 O by biochar in the soil, the underlying abiotic mechanism remained poorly understood.…”

Section: Discussionsupporting

confidence: 83%

Abiotic mechanisms for biochar effects on soil N2O emission

He¹,

Manevski²,

Andersen³

et al. 2019

Int. Agrophys.

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In this research, sterile soil columns with different contents of biochar made from apple-tree residues (0, 1 and 5% w/w) at three levels of water filled pore space (40, 60, and 80%) were set up in the laboratory to study nitrous oxide diffusion and binding processes. The results indicated that nitrous oxide emission can be effectively mitigated at 5% biochar regardless of soil water content. However, 1% biochar stimulated nitrous oxide diffusion compared to the other biochar treatments, which was opposite to expectations due to the stronger aeration than adsorption effect, while 0% had a suppression effect between 1 and 5%. Nitrous oxide emissions increased with increasing water filled pore space due to concomitantly decreasing biochar tortuousity at high water content. The increase of nitrogen from 1.11 to 1.50% on the biochar surface in the 5% treatment, and from 1.11 to 1.46% in the 100% biochar treatment, suggested that the main abiotic mechanisms for mitigation of nitrous oxide emission is adsorption and subsequent reactions with C

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Section: Discussionsupporting

confidence: 83%

Abiotic mechanisms for biochar effects on soil N2O emission

He¹,

Manevski²,

Andersen³

et al. 2019

Int. Agrophys.

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“…Apply conventional tillage lowered the stability of aggregate significantly. He et al (2016) reported that biochar may greatly influence aggregate stability due to its low bulk density. Frequent land cultivation may cause soil particles dispersed and creation of soil aggregate that a function of biological activity and time is disturbed (Herath et al, 2013).…”

Section: Results and Discussion Soil Aggregate Stability Indexmentioning

confidence: 99%

“…Biochar is not an organic fertilizer, because it cannot add nutrients but it has a high affinity for nutrients and persistent in the soil as well as increase cation exchange capacity (Barrow 2012). He et al (2016) found biochar amendment increased soil nitrification activity in soils. Biochar may greatly improve soil structure and aeration due to its high porosity and low bulk density (Joseph et al, 2010), thereby providing favorable condition for nitrification.…”

Section: Introductionmentioning

confidence: 99%

Biochar and Tillage Systems Influenced on Soil Physical Properties

Darusman

Syahruddin

Syakur

et al. 2017

Aceh Int. J. Sci.Technol

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Biochar is known as huge carbon storage in the soil. In the soil, biochar absorbs CO2 from air and keep them for hundred years. In addition to prevention, reducing emission and green house effects, Biochar also contributes to soil productivity such as physical and chemical property improvement of the soil. How biochar amends soil physical properties combined with some tillage systems are imperative to find out. This study aimed to determine the influence of biochar and tillage systems on some soil physical properties. Treatment arranged in a factorial randomized block design with three replications. The treatment of biochar effect consist of four levels; 0, 10, 15, and 20 t ha-1 Biochar. The tillage systems were three levels; no, minimum, and conventional tillage. The results showed that we found an interaction effect on the biochar application with tillage systems on dried bulk density, soil porosity, and soil permeability. No interaction was found on aggregate stability indexes and soil water holding capacity at water content at-0.3 and-15 bar of water potential (pF 2.54 and 4.2, accordingly). Biochar amounting of 10 t ha-1 combined with minimum tillage gave significant benefits on soil productivity in terms of dried bulk density, porosity and soil permeability.

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“…The interactions between biochar and SOM, soil pH, soil texture, fertilization, and soil moisture on mineral N dynamics and N 2 O efflux can help inform the mechanisms by which biochar impacts N 2 O efflux. Hypotheses for biochar's ability to reduce N 2 O include effects on nitrification and denitrification rates (Wang et al ., ; He et al ., ), sorption of mineral N to the biochar (Sohi et al ., ; Case et al ., ; van Zwieten et al ., ) and impacts on soil aeration (Rogovska et al ., ; Augustenborg et al ., ; Mukherjee et al ., ). These incubations explored such hypotheses by looking at impacts on mineral N dynamics and the resulting N 2 O efflux across treatments.…”

Section: Discussionmentioning

confidence: 99%

Woody biochar's greenhouse gas mitigation potential across fertilized and unfertilized agricultural soils and soil moisture regimes

Ramlow

Cotrufo

2017

GCB Bioenergy

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Biochar has been widely researched as an important technology for climate smart agriculture, yet work is still necessary to identify the magnitude of potential greenhouse gas (GHG) mitigation and mechanisms involved. This study measured slow-pyrolysis wood-derived biochar's impact on GHG efflux, mineral N dynamics, and soil organic C in a series of two incubations across fertilized and unfertilized agricultural soils and soil moisture regimes. This research explored the magnitude of biochar's full GHG mitigation potential and drivers of such impacts. Results of this incubation indicate slow-pyrolysis wood-derived biochar has potential to provide annual emission reductions of 0.58-1.72 Mg CO 2 -eq ha À1 at a 25 Mg ha À1 biochar application rate. The greatest GHG mitigation potential was from C sequestration and nitrous oxide (N 2 O) reduction in mineral N fertilized soils, with minimal impacts on N 2 O emissions in unfertilized soils, carbon dioxide (CO 2 ) emissions, and methane (CH 4 ) uptake. Analysis of mineral N dynamics in the bulk soil and on biochar isolates indicated that neither biochar impacts on net mineralization and nitrification nor retention of ammonium (NH þ 4 ) on biochar isolates could explain biochar's N 2 O reduction. Instead, biochar amendments exhibited consistent N 2 O emission reductions relative to the N 2 O emission in the control soil regardless of soil type and fertilization. Results across a soil moisture gradient suggest that woody biochar may aerate soils shifting redox conditions and subsequent N 2 O production. Understanding the magnitude of biochar's GHG reduction potential and the mechanisms driving these effects can help inform biochar modeling efforts, explain field results and identify agricultural applications that maximize biochar's full GHG mitigation potential.

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The effects of rice-straw biochar addition on nitrification activity and nitrous oxide emissions in two Oxisols

Cited by 56 publications

References 54 publications

Abiotic mechanisms for biochar effects on soil N2O emission

Abiotic mechanisms for biochar effects on soil N2O emission

Biochar and Tillage Systems Influenced on Soil Physical Properties

Woody biochar's greenhouse gas mitigation potential across fertilized and unfertilized agricultural soils and soil moisture regimes

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