How does biochar influence soil N cycle? A meta-analysis

Liu, Qi; Zhang, Yanhui; Liu, Benjuan; Amonette, James E.; Lin, Zhibin; Liu, Gang; Ambus, Per; Xie, Zubin

doi:10.1007/s11104-018-3619-4

Cited by 241 publications

(193 citation statements)

References 79 publications

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“…2a-d). These results are in conformity with a meta-analysis of Liu et al (2018), which shows a positive response of plant nitrogen uptake and crop productivity up to a biochar application rate of 80 Mg ha −1 . Subscript numbers indicate the fertilizer group affiliation.…”

Section: Biochar Effect On Nitrogen Uptake Of Winter Rye and Lupinesupporting

confidence: 90%

Effect of biochar fertilizers on amino acid variability of Secale cereale and Lupinus angustifolius

Wiedner

Schimpf

Polifka

et al. 2019

Biochar

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Little is known on the effects of biochar on N uptake and amino acid variability in crops such as winter rye and narrow-leafed lupine despite the fact that amino acids are important indicators, for food quality and plant stress. N uptake of both crops showed contrasting results when treated with different biochar fertilizers. Total amino acid contents referred to total nitrogen generally tend to decrease in rye grains in the presence of biochar; whereas lupine seeds were more or less unaffected by biochar combined with mineral fertilizer or compost. In lupine seeds, total amino acid contents significantly increased when biochar was mixed with digestate but decreased when mixed with fermented digestate. Lysine, one of the most limiting amino acids in cereals, reached the recommended value of 4 g kg −1 in rye grain for most biochar fertilizers. In lupine seeds, lysine decreased when biochar had been applied but were still in the recommended range when used as animal feed. Proline, an indicator for plant stress, significantly decreased (− 49%) in rye when 2 Mg biochar ha −1 was added in combination with mineral fertilizer. In contrast, proline increased when biochar was added to organic (digestate and compost) fertilizers (up to 43%). Further biochar research should focus much more on food quality, which is a key challenge for global food production.

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Section: Biochar Effect On Nitrogen Uptake Of Winter Rye and Lupinesupporting

confidence: 90%

Effect of biochar fertilizers on amino acid variability of Secale cereale and Lupinus angustifolius

Wiedner

Schimpf

Polifka

et al. 2019

Biochar

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“…Meta-analysis in agricultural ecosystems has shown that plant growth response to biochar is sensitive to application rate: below the application rate equivalent to 7.4%, a majority of studies observed positive plant growth responses; as the application rate increased to 55%, a larger portion of studies showed negative growth responses [64]. Similarly, plant uptake of N was also mostly suppressed at higher biochar application rates [67]. We are uncertain whether higher dosage of biochar prevents plants from using soil N and growth by reducing N availability.…”

Section: Discussionmentioning

confidence: 99%

“…We are uncertain whether higher dosage of biochar prevents plants from using soil N and growth by reducing N availability. However, soil N responses should be sensitive to biochar application rate, because the latter is closely related to soil physiochemical properties which can affect N cycling [67,68]. Nevertheless, high-dosage biochar experiment is still underrepresented with limited amount of studies, and more observations are needed for a clear picture of biochar-soil interactions [69].…”

Section: Discussionmentioning

confidence: 99%

Biochar influences nitrogen availability in Andisols of north Idaho forests

Shan

Coleman

2020

SN Appl. Sci.

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Biochar application in forest soils can influence tree growth and forest productivity through mediating plant-available nitrogen (N) pools. However, how soil N availability and related transformations respond to biochar addition in cold-temperate forest ecosystems is not well understood. Our study assessed the effect of a hardwood forest residue biochar on soils taken from an elevational gradient within a cold-temperate, north Idaho forest. Forest soils were incubated at 0%, 10% and 20% biochar amendments in a greenhouse for 120 days. We measured soil small organic N (amino compound) and inorganic N (ammonium and nitrate) pools, enzyme activities, small organic N turnover, N mineralization and nitrification rates. Biochar decreased small organic N and inorganic N concentrations in most elevations. Enzyme analysis shows biochar increased the activity of aminopeptidase, but decreased the activity of N-acetyl-β-d-glucosaminidase, β-glucosidase and acid phosphatase. Biochar did not influence small organic N turnover and N mineralization rates, but decreased nitrification rate. In conclusion, hardwood forest residue biochar application in cold-temperate forests has important impact on short-term soil N cycling.

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“…Emissions were not influenced by the lower pH or the higher content of K, Ca, and Mg in vinasse. It is well known that biochar can affect the water-holding capacity of the substrates [22], but because of the small relative weight of biochar amendment (0.272% of total soil weight; 0.725% for the 0-10 cm layer), no significant effect on soil moisture compared to control, nor on differences in soil moisture between treatments, is expected. Moisture was also assumed to be not significantly different between treatments, as no significant effect on soil water-holding capacity was expected, watering was the same for all treatments, no leaching or negligible leaching was monitored, uptake by plants was not different [53], and, as the relative amount of amended biochar was small and the biochar pellets were mixed, albedo of the soil should not be affected, therefore not affecting evaporation.…”

Section: Discussionmentioning

confidence: 99%

“…An alternative mechanism for explaining the differences in emissions after application of the different biochars could be a combination of biochar-mediated soil organic matter mineralization enhancement, in parallel with NH 4 + sorption by the biochar which, in turn, reduces the nitrification potential. Although biochar has been reported to have opposed effects on mineralization [46], meta-analyses show a general increase in mineralization activity in biochar-amended soils [22,23], an increase that is usually attributed to the priming effect of biochar, by stimulating microorganisms to mineralize recalcitrant soil organic matter in response to the C input [21,41,46]. This would lead to an increase of nitrification activity [21], due to the NH 4 + becoming available as a result of the ammonification process.…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Hay Biochar Application into Soil Increases N2O Fluxes

et al. 2020

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Biochar has been proposed as an amendment that can improve soil conditions, increase harvest yield, and reduce N losses through NO3− leaching and N2O emissions. We conducted an experiment to test the hay biochar mitigation effect on N2O emissions depending on its production temperature. The pot experiment consisted of the soil amendment with three different production temperature biochars (300 °C, 550 °C, 850 °C) alone and in combination with three different organic fertilizers (cattle slurry, slurry digestate, vinasse), in growth chamber conditions. The effects of biochar and fertilizer were both significant, but the interaction biochar:fertilizer was not. The amendment with the three fertilizer types and with the highest production temperature biochar resulted in significantly higher cumulative N2O fluxes. Biochar did not show a mitigation effect on N2O emissions when applied with organic fertilizer. Cumulative emissions were higher with biochar addition, with increasing emissions for increasing biochar production temperature. Our results support the idea that biochar cannot be considered as a universal tool for the reduction of N2O emissions.

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How does biochar influence soil N cycle? A meta-analysis

Cited by 241 publications

References 79 publications

Effect of biochar fertilizers on amino acid variability of Secale cereale and Lupinus angustifolius

Effect of biochar fertilizers on amino acid variability of Secale cereale and Lupinus angustifolius

Biochar influences nitrogen availability in Andisols of north Idaho forests

High-Temperature Hay Biochar Application into Soil Increases N2O Fluxes

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