Interactions between biochar and litter priming: A three-source 14C and δ13C partitioning study

Cui, Jun; Ge, Tida; Kuzyakov, Yakov; Nie, Ming; Fang, Changming; Tang, Boping; Zhou, Chun-Lin

doi:10.1016/j.soilbio.2016.10.014

Cited by 44 publications

(40 citation statements)

References 64 publications

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“…Such priming interactions between native SOC and labile biochar OC are likely to depend in part on native SOC properties in addition to biochar OC properties and interactions among biochar OC pools (Cross and Sohi, 2011; Wang et al, 2016; Whitman et al, 2013, 2014). Specifically, biochar has been shown to cause selective positive priming of simple soil organic matter molecules and fresh plant residues (Arif et al, 2016; Cui et al, 2017; Farrell et al, 2015). Our findings of an apparent positive priming in response to bicarbonate‐soluble biochar OC amendment are in agreement with assertions that biochar LOC is largely responsible for observed positive priming effects of biochar (Cheng et al, 2016; Cross and Sohi, 2011).…”

Section: Discussionmentioning

confidence: 99%

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions

Fidel¹,

Laird²,

Parkin

2017

J of Env Quality

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Biochar has been shown to influence soil CO and NO emissions following application to soil, but the presence of carbonates in biochars has largely confounded efforts to differentiate among labile and recalcitrant C pools in biochar and establish their timeframe of influence. Understanding the mechanism, magnitude, and duration of biochar C pools' influence on C and N dynamics is imperative to successful implementation of biochar for C sequestration. Here we therefore aim to assess biochar organic and inorganic C pool impacts on CO and NO emissions from soil amended with two untreated biochars, inorganic carbon (as NaCO), acid (HCl) and bicarbonate (NaHCO) extracts of the biochars, and acid and bicarbonate/acid-washed biochars during a 140-d soil incubation. We hypothesized that (i) both biochar labile organic carbon (LOC) and inorganic carbon (IC) pools contribute significantly to short-term (<1 mo) CO emissions from biochar-amended soil, (ii) biochars will influence the size of soil NH and NO pools, and (iii) changes in soil inorganic N pools will affect soil NO emissions. All biochar, biochar extract, and carbonate treatments (12 total) increased CO produced during the initial ≤48 h of the incubation relative to controls, indicating that both biochar LOC and IC contribute to CO emissions. Of these treatments, only bicarbonate extracts of the biochars increased total C losses significantly. However, treatment impacts on soil NO production were not significant despite significant effects of select treatments on inorganic N pools. Overall, results indicate that biochars contain small LOC and IC pools that are stabilized by a larger recalcitrant organic C pool.

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Section: Discussionmentioning

confidence: 99%

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions

Fidel¹,

Laird²,

Parkin

2017

J of Env Quality

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“…Kettunen et al 2005Kettunen et al , 2007b. In the study of Cui et al (2017), microbes utilized N-poor (1.41%) litter but biochar addition only (non-significantly) enhanced the cumulative respiration. In mesocosm experiments with the same biochar and soil types as in this study, the biochar had only a minor and temporary impact on enzyme activities in the soil (Niemi et al 2015) and it increased microbial respiration only during dry conditions by increasing the soil moisture content (Saarnio et al 2013).…”

Section: Biochar Enhances Decomposition Of N-rich Littermentioning

confidence: 94%

Biochar addition affected nutrient leaching and litter decomposition rates in boreal sandy soils

Saarnio

Kettunen

2020

AFSci

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Effects of biochar addition on litter decomposition rates, nutrient leaching and soil moisture were tested in two boreal agricultural soils; a sandy till and a medium fine sand. Three litter bags were buried in soil basins, which were stored in the dark for 31 and 19 weeks in the sandy till experiment and medium fine sand experiment, respectively. Once per each temperature period, the soil was saturated in order to collect excess water for nutrient analyses. Biochar increased the decomposition rate of N-rich litter but did not affect the decomposition of N-poor litter. PO43--P and NO2--N were released from the biochar to the leached water and thus leaching of PO43--P, NO2--N and total P was increased in the soil with the finer texture. However, biochar retained water after heavy irrigation and leaching of PO43--P and total P was not increased on the coarser soil. Although pure biochar adsorbed NH4+-N from nutrient solutions, NH4+-N leaching from both soil types was generally not affected by biochar. Leaching of nitrate NO3--N and total N was decreased on both soils due to retention by the biochar.

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“…Some studies showed the total CO 2 emission in the biochar treatment and CO 2 amount derived from biochar (Kuzyakov et al 2009;Keith et al 2011;Naisse et al 2015a), and the decomposition amount of NSOC was calculated by the difference. Some studies showed the cumulative CO 2 emission derived from NSOC under different incubation stages (Cross and Sohi 2011;Keith et al 2011;Bruun and El-Zehery 2012;Singh et al 2012;Maestrini et al 2014b;Whitman et al 2014;Dharmakeerthi et al 2015;Rittl et al 2015;Cui et al 2017). X e and X c were calculated using the following equation:…”

Section: Data Collectionmentioning

confidence: 99%

A meta-analysis and critical evaluation of influencing factors on soil carbon priming following biochar amendment

et al. 2017

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Purpose Previous studies have found biochar-induced effects on native soil organic carbon (NSOC) decomposition, with a range of positive, negative and no priming reported. However, many uncertainties still exist regarding which parameters drive the amplitude and the direction of the biochar priming. Materials and methods We conducted a quantitative analysis of 1170 groups of data from 27 incubation studies using boosted regression trees (BRTs). BRT is a machine learning method combining regression trees and a boosting algorithm, which can effectively partition independent influences of various factors on the target variable in the complex ecological processes. Results and discussion The BRT model explained a total of 72.4% of the variation in soil carbon (C) priming following biochar amendment, in which incubation conditions (36.5%) and biochar properties (33.7%) explained a larger proportion than soil properties (29.8%). The predictors that substantially accounted for the explained variation included incubation time (27.1%) and soil moisture (5.0%), biochar C/N ratio (6.2%), nitrogen content (5.5%), pyrolysis time during biochar production (5.1%), biochar pH (4.5%), soil C content (5.2%), sand (4.7%) and clay content (4.1%). In contrast, other incubation conditions (temperature, biochar dose, whether nutrient was added), biochar properties (biochar C, feedstock type, ash content, pyrolysis temperature, whether biochar was activated) and soil properties (nitrogen content, silt content, C/N ratio, pH, land use type) had small contribution (each < 4%). Positive priming occurred within the first 2 years of incubations, with a change to negative priming afterwards. The priming was negative for low N biochar or in high-moisture soils but positive on their reverse sides. The size of negative priming increased with rising biochar C/N ratio, pyrolysis time and soil clay content, but deceased with soil C/N ratio. Conclusions We determine the critical drivers for biochar effect on native soil organic C cycling, which can help us to better predict soil C sequestration following biochar amendment.

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Interactions between biochar and litter priming: A three-source 14C and δ13C partitioning study

Cited by 44 publications

References 64 publications

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions

Biochar addition affected nutrient leaching and litter decomposition rates in boreal sandy soils

A meta-analysis and critical evaluation of influencing factors on soil carbon priming following biochar amendment

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Interactions between biochar and litter priming: A three-source 14C and δ13C partitioning study

Cited by 44 publications

References 64 publications

Impact of Biochar Organic and Inorganic Carbon on Soil CO2and N2O Emissions

Impact of Biochar Organic and Inorganic Carbon on Soil CO2and N2O Emissions

Biochar addition affected nutrient leaching and litter decomposition rates in boreal sandy soils

A meta-analysis and critical evaluation of influencing factors on soil carbon priming following biochar amendment

Contact Info

Product

Resources

About

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions

Impact of Biochar Organic and Inorganic Carbon on Soil CO₂and N₂O Emissions