Effects of Two Types of Straw Biochar on the Mineralization of Soil Organic Carbon in Farmland

Hu, Lening; Li, Shuangli; Li, Ke; Huang, Haiyan; Wan, Wenxin; Huang, Qiu-Hua; Li, Qiuyan; Li, Yafen; Deng, Hua; He, Ting

doi:10.3390/su122410586

Cited by 21 publications

(8 citation statements)

References 51 publications

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“…SOC mineralization is the inevitable result of soil microbial activity. The results of this study showed that SOC mineralization after each form of straw addition showed a trend toward rapid changes in the early stages of the incubation which slowed with time, which is similar to trends observed in previous research (Hu et al, 2020). This trend was mainly related to the rapid utilization of active substrates at the beginning of the incubation period, which leads to a decrease in the availability of active substrates at the end of the incubation period (Kan et al, 2020).…”

Section: Discussionsupporting

confidence: 91%

Changes in soil organic carbon and microbial community in saline soil following different forms of straw incorporation

Fan,

Zhang,

et al. 2024

European J Soil Science

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Straw has been commonly incorporated into soil to increase soil organic carbon (SOC) content. However, the response and mechanism of organic carbon transformation following the addition of different forms of straw to saline soil to have not been fully evaluated. Thus, in our study, chopped wheat straw, granular wheat straw and wheat straw biochar were used as exogenous organic amendments. The carbon‐to‐nitrogen ratio of each form of straw was adjusted to 25:1. Under the same amount of carbon input, the three forms of straw were added to saline soil for a one‐year incubation experiment. The research focused on studying the changes in SOC transformation, enzyme activity, and microbial community structure. At the end of incubation, both granular and biochar straw treatments had significantly increased SOC relative to the unamended control, with extent of SOC increase greater in the biochar straw treatment. The biochar straw treatment also had significantly higher dissolved organic carbon than the other treatments at end of the incubation. The enzyme activity of β‐cellobiohyrolase (CBH) was the highest in the granular straw treatment, which was increased by 71.9% compared with the chopped straw treatment (p < 0.05). The cumulative carbon mineralization amount (Cum C) in the granular straw treatment was the highest, which was increased by 757.4% and 21.3% compared with the biochar straw and chopped straw treatments, respectively (p < 0.05). The Mantel test analysis further revealed significant correlations between soil bacterial community and SOC content in soils treated with different straw incorporation forms, as well as between fungal community and extracellular enzyme activities. We assumed that a possible reason for the high SOC mineralization amount in the granular straw treatment was changing the structure of the Bacteroidota in the bacterial phylum and Blastocladiomycota in the fungal phylum. Based on these findings, it is believed that adding biochar can increase the SOC content, but its utilization by microorganisms is limited. However, applying granular straw will not have a negative impact on its use as a microbial carbon source, thereby promoting carbon transformation. Therefore, in future research aimed at enhancing soil fertility in saline soil regions, the adoption of granular straw as an agricultural practice is recommended and should be promoted.

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Section: Discussionsupporting

confidence: 91%

Changes in soil organic carbon and microbial community in saline soil following different forms of straw incorporation

Fan,

Zhang,

et al. 2024

European J Soil Science

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“…These modified Terra Preta soils were characterized by 35% black carbon in the surface layer [ 4 ]. Additionally, Hu [ 5 ] proposed that the mineralization of soil organic carbon (SOC) showed a strong negative excitation effect following the biochar addition, which reduced the mineralization rate of the SOC. Song [ 6 ] also indicated that the addition of biochar could increase the content of the SOC, which could be used by microorganisms, thus inhibiting organic carbon mineralization.…”

Section: Introductionmentioning

confidence: 99%

Biochar Blended with Nitrogen Fertilizer Promotes Maize Yield by Altering Soil Enzyme Activities and Organic Carbon Content in Black Soil

Sun

Wang³

et al. 2023

IJERPH

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Biochar and nitrogen fertilizers are known to increase soil carbon storage and reduce soil nitrogen loss as amendments, suggesting a promising strategy for highly effectively increasing soil productivity. However, few studies have explored the mechanisms of their effects on crop yield in terms of active carbon fraction and enzyme activity, which ultimately limits the potential for the application of biochar in combination with nitrogen fertilizers. To evaluate the effect of biochar and nitrogen fertilizer on the improvement of black soils in northeast China, a field experiment was conducted in the black soil to compare and analyze the application methods on total organic carbon (TOC), total nitrogen (TN), enzyme activities, and maize yields. Biochar rates: CK, C1, C2, and C3 (0, 9.8, 19.6, and 29.4 Mg·ha−1); N fertilizer rates: N1/2 and N (30 and 60 kg·ha−1). Results indicated that biochar and N fertilizer amendments significantly ameliorated soil fertility, such as TOC and TN, compared to the unamended soil. The TOC levels in the C3 treatment increased by 35.18% and the TN levels by 23.95%. The improvement in TN is more significant when biochar is blended with N fertilizer. Biochar blended with N fertilizer increased maize cellulase, urease, and invertase activities by an average of 53.12%, 58.13%, and 16.54%, respectively. Redundancy analysis showed that TOC, TN, and MBN contributed 42%, 16.2%, and 22.2%, respectively, to the maize yield indicator. Principal component analysis showed that reduced N fertilizer was more effective in improving yields, with a maximum yield increase of 50.74%. Biochar blended with N fertilizer is an effective strategy to improve the fertility and productivity of black soils in northeast China, while nitrogen fertilizer reduction is feasible and necessary for maintaining grain yield.

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“…Soil cation exchange capacity (CEC) was determined by the barium chloride-sulfuric acid forced exchange method (Zhang et al, 2010). Soil organic carbon (SOC) was determined by the potassium dichromate oxidation-spectrophotometric method (Hu et al, 2020). Soil dissolved organic carbon (DOC) content was determined by TOC total organic carbon analyzer (Huang et al, 2018).…”

Section: Measurement Methodsmentioning

confidence: 99%

“…where V 0 is the volume of standard hydrochloric acid consumed during the blank titration, V is the volume of standard hydrochloric acid consumed during the sample titration, c is the concentration of standard hydrochloric acid, 0.022 is the molar mass of carbon dioxide (1/2CO 2 ), M (1/2CO 2 ) = 0.022 g mmol −1 , 22.4 × 1000/44 is the number of milliliters per gram of CO 2 in the standard state; △t is the incubation interval (d); C t is the cumulative mineralization at incubation time t (d), C 0 is the potential mineralization of soil carbon, C (mg•kg −1 ); k is the rate constant of soil carbon mineralization, d −1 ; t is the incubation time, day (d) (Hu et al, 2020).…”

Section: Cumulative Mineralization Comentioning

confidence: 99%

Effects of magnesium-modified biochar on soil organic carbon mineralization in citrus orchard

Huang²,

Zhou³

et al. 2023

Front. Microbiol.

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In order to investigate the carbon sequestration potential of biochar on soil, citrus orchard soils with a forest age of 5 years was taken as the research object, citrus peel biochar (OBC) and magnesium-modified citrus peel biochar (OBC-mg) were selected as additive materials, and organic carbon mineralization experiments were carried out in citrus orchard soil. OBC and OBC-Mg were applied to citrus orchard soils at four application rates (0, 1, 2, and 4%), and incubated at a constant temperature for 100 days. Compared with CK, the cumulative mineralization of soil organic carbon decreased by 5.11% with 1% OBC and 2.14% with 1% OBC-Mg. The application of OBC and OBC-Mg significantly increased the content of soil organic carbon fraction, while the content of soil organic carbon fraction was higher in OBC-Mg treated soil than in OBC treated soil. Meanwhile, the cumulative mineralization of soil organic carbon was significantly and positively correlated with the activities of soil catalase, urease and sucrase. The enzyme activities increased with the cumulative mineralization of organic carbon, and the enzyme activities of the OBC-Mg treated soil were significantly higher than those of the OBC treated soil. The results indicated that the OBC-Mg treatment inhibited the organic carbon mineralization in citrus orchard soils and was more favorable to the increase of soil organic carbon fraction. The Mg-modified approach improved the carbon sequestration potential of biochar for citrus orchard soils and provided favorable support for the theory of soil carbon sink in orchards.

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Effects of Two Types of Straw Biochar on the Mineralization of Soil Organic Carbon in Farmland

Cited by 21 publications

References 51 publications

Changes in soil organic carbon and microbial community in saline soil following different forms of straw incorporation

Changes in soil organic carbon and microbial community in saline soil following different forms of straw incorporation

Biochar Blended with Nitrogen Fertilizer Promotes Maize Yield by Altering Soil Enzyme Activities and Organic Carbon Content in Black Soil

Effects of magnesium-modified biochar on soil organic carbon mineralization in citrus orchard

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