Contrasting effects of straw and straw–derived biochar application on net global warming potential in the Loess Plateau of China

Zhang, Afeng; Cheng, Gong; Hussain, Qaiser; Zhang, Man; Feng, Hao; Dyck, Miles; Sun, Benhua; Zhao, Ying; Chen, Haixin; Chen, Jing; Wang, Xudong

doi:10.1016/j.fcr.2017.02.006

Cited by 114 publications

(46 citation statements)

References 47 publications

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“…Increasing SOC through the application of biochar can be attributed to its high C content and protection of native organic carbon from utilization (Ouyang, Yu, & Zhang, ). In a 2‐year experiment of wheat and maize cropping system in an alkaline soil, Zhang et al () found an increase in SOC at different soil depths under wheat straw‐biochar treatment. In 2 years, the increase in the concentration of SOC (0–20 cm) was 0.04 g C kg −1 in the control treatment and 2.1 g C kg −1 in the plot receiving wheat straw‐biochar at a rate of 16 t ha −1 combine with chemical fertilizer.…”

Section: Biochar As Soil Amelioratormentioning

confidence: 99%

Impact of biochar properties on soil conditions and agricultural sustainability: A review

et al. 2017

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This review summarizes the influences of pyrolysis conditions and feedstock types on biochar properties and how biochar properties in turn affect soil properties. Mechanistic evidence of biochar's potential for enhancing crop productivity, carbon sequestration, and nutrient use efficiency are also discussed. The review identifies the knowledge gaps, limitations, and future research directions for large‐scale use of biochar. Both pyrolytic parameters and feedstock types are considered to be the main factors controlling biochar properties such as nutrient content, recalcitrance, and pH. Biochar produced at low temperatures may improve nutrient availability and crop yield in acidic and alkaline soils, whereas high‐temperature biochar may enhance long‐term soil carbon sequestration. Biochar can also improve the efficiency of inorganic and organic fertilizers by enhancing microbial functions and reducing nutrient loss, thereby making nutrients more available to plants. Integration of biochar and chemical or organic fertilizers generally provides for better nutrient management and crop yield in most types of soils. Although biochar can improve degraded soils, it is not a panacea; as such, soil‐ and crop‐specific biochar are needed in order to ensure optimum crop yield and agricultural sustainability.

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Section: Biochar As Soil Amelioratormentioning

confidence: 99%

Impact of biochar properties on soil conditions and agricultural sustainability: A review

et al. 2017

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“…Temperate, semi‐arid croplands have been considered as N 2 O sources . In the study, N 2 O emissions increased obviously after N addition.…”

Section: Discussionmentioning

confidence: 99%

Impact of Different Nitrogen‐Horizontal Placements on Greenhouse Gas Exchange in an Apple Orchard

Zhang

Guo

2019

CLEAN Soil Air Water

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Nitrogen (N) placement can impact nitrogen use efficiency, but its effect on greenhouse gas (GHG) emissions remain unclear. The objective of this study is to compare the effects of four different N horizontal placement methods (i.e., annular canal (An), radial canal (Ra), band (Ba), and nest fertilization (Ne)) with urea broadcast (Br) on nitrous oxide (N2O), methane (CH4), and soil heterotrophic respiration carbon dioxide (CO2) emissions from an apple orchard to assess the seasonal and spatial variations in these gas emissions. The total cumulative GHG emissions are determined through spots that are differentiated as fertilized or unfertilized. A field simulation study is conducted in an apple orchard, and all N sources have an application rate of 300 kg N ha−1. In the spots with fertilizer application, the N2O emissions from the Br treatment are significantly lower than those of other treatments, and the emissions from the Ne treatment are 1.7‐fold higher than those of the Br treatment. Surprisingly, the cumulative N2O emissions from the Br treatment are significantly higher than those of the other four treatments. N horizontal placement does not significantly influence the soil CH4 sink. The CO2 emissions in the Br treatment are higher than in other treatments. High N2O emissions in the Br treatment result in a significantly higher GHG exchange than in other treatments, while the Ne treatment significantly reduces the GHG exchange throughout the measurement period. Therefore, optimizing N placement may serve as an effective way to reduce GHG emissions from arable soils.

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“…In addition, there are long sunshine hours (2100–2200 h) and high evaporation (>990 mm) in this area. The category of the soils is Earth‐cumuli‐Orthic Anthrosols, derived from loess deposits with a silty clay loam texture (Zhang et al., 2017). The soil texture (0–10 cm) is silty clay loam, consisting of 8% sand, 74% silt, and 18% clay.…”

Section: Methodsmentioning

confidence: 99%

“…Zhang et al. (2017) reported that straw amendments tend to result in an increase in soil CO 2 emissions. Gravel mulching is more environmentally friendly and reduces GHG emissions.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas emissions and carbon footprint under gravel mulching on China's Loess Plateau

Wang

Zhang

et al. 2020

Agronomy Journal

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Gravel mulching technology has been widely verified as an effective solution to reduce evaporation and improve crop production on China's Loess Plateau, but its impacts on greenhouse gas (GHG) emissions have not been well documented. This study examined the quantification of the overall GHG emissions via estimating global warming potential (GWP), GHG intensity (GHGI), C footprint (CF), and C intensity (CI) with varying experimental treatments. A 2-yr consecutive wheat-maize rotation field experiment was conducted through monitoring GHG emissions using a closedchamber method with four treatments: CK (control with no mulching), WCK (CK plus 50 mm irrigation), GM (CK plus gravel mulching), and WGM (WCK plus GM).Compared with the CK, gravel mulching significantly decreased soil CO 2 emissions and increased soil CH 4 uptake over both cycles, although patterns of soil N 2 O emissions were controversial. Mixed effects of gravel mulching and irrigation significantly minimized the GWP over both cycles. Compared with the CK, annual GHGI in the WCK, GM, and WGM treatments dramatically decreased by 35.1, 53.7, and 55.9%, respectively, over Cycle 1 and by 16.7, 19.6, and 37.2%, respectively, over Cycle 2. The average CFs in the WCK, GM, and WGM treatments over both cycles were 4.4, 35.0, and 58.7% lower than in the CK, respectively. Gravel mulching had no significant effect on the CI during Cycle 1 but did have a significant effect during Cycle 2. Thus, gravel mulching is a recommended practice to mitigate GHG emissions and enhance the crop productivity on the Loess Plateau of China.

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Contrasting effects of straw and straw–derived biochar application on net global warming potential in the Loess Plateau of China

Cited by 114 publications

References 47 publications

Impact of biochar properties on soil conditions and agricultural sustainability: A review

Impact of biochar properties on soil conditions and agricultural sustainability: A review

Impact of Different Nitrogen‐Horizontal Placements on Greenhouse Gas Exchange in an Apple Orchard

Greenhouse gas emissions and carbon footprint under gravel mulching on China's Loess Plateau

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