The variability and causes of organic carbon retention ability of different agricultural straw types returned to soil

Wang, Han; Zhang, Yannan; Hu, Yu; Wu, Jihua; Fu, Xiaohua; Le, Yiquan

doi:10.1080/09593330.2016.1201545

Cited by 21 publications

(8 citation statements)

References 69 publications

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“…It is almost alarming that in an annual application of wheat straw (5 t DM ha −1 = 2140 kg C ha −1 ) C SOM also decreased (by 8%). It is obvious that straw is relatively quickly mineralized after its incorporation into the soil [ 24 , 25 , 26 , 27 ]. Due to this fact it is clear that cereal straw application itself cannot improve the soil organic matter content and quality.…”

Section: Discussionmentioning

confidence: 99%

Soil Organic Matter Degradation in Long-Term Maize Cultivation and Insufficient Organic Fertilization

Balík

Kulhánek

Černý

et al. 2020

Plants

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Soil organic matter carbon (CSOM) compounds degradation was observed in long-term field experiments with silage maize monoculture. Over a period of 26 years, the content of carbon in topsoil decreased by 22% in control unfertilized plots compared to 25% and 26% in treatments fertilized annually with mineral nitrogen. With annual wheat straw application (together with mineral N), the content of CSOM decreased by 8%. Contrary to that, the annual application of farmyard manure resulted in a CSOM increase of 16%. The ratio of carbon produced by maize related to total topsoil CSOM content ranged between 8.1–11.8%. In plots with mineral N fertilization, this ratio was always higher than in the unfertilized control plots. With the weaker soil extraction agent (CaCl2), the ratio of carbon produced by maize was determined to be 17.9–20.7%. With stronger extraction agent (pyrophosphate) it was only 10.2–14.6%. This shows that maize produced mostly unstable carbon compounds. Mineral N application resulted in stronger mineralization of original and stable organic matter compared to the unfertilized control. However, the increase of maize-produced carbon content in fertilized plots did not compensate for the decrease of “old” organic matter. As a result, a tendency to decrease total CSOM content in plots with mineral N applied was observed.

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Section: Discussionmentioning

confidence: 99%

Soil Organic Matter Degradation in Long-Term Maize Cultivation and Insufficient Organic Fertilization

Balík

Kulhánek

Černý

et al. 2020

Plants

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“…The mixture was then transferred to a tube furnace under an N 2 atmosphere. Next, the mixture was calcined at different temperatures (400, 500, 600, 700, 800, and 900 C) and different pyrolysis times (30,60, and 90 min). The heating and cooling rates were 10 C/min, and 20 C/min, respectively.…”

Section: Preparation Of Multivalent Iron-loaded Biochar (Fe@bc)mentioning

confidence: 99%

“…27 Biochar, as a reducing agent, to reduce iron oxide at high temperatures, avoids not only the shortcomings of the impregnation method but also form more active sites on the surface of the activator. 28,29 Soybean straw, a candidate material for biochar, has the highest carbon content (41.0%-47.8%), lowest nitrogen content, 30,31 and the highest C/N and cellulose/N compared to wheat, corn, cotton, and others. 31 Further, ash generated by the high-temperature pyrolysis of soybean straw is negligible, and the carbonization rate is high.…”

mentioning

confidence: 99%

Activation of persulfate by iron‐loaded soybean straw biochar for efficient degradation of dye contaminants: Synthesis, performance, and mechanism

Yue

Zhu

Zeng

et al. 2023

Env Prog and Sustain Energy

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Biochar loaded with metal ions has been widely used to activate persulfate to degrade organic pollutants. However, the preparation conditions of catalysts are always controversial. In this study, the co‐heating conditions of soybean straw with high carbon and low nitrogen and nano‐iron oxide were systematically discussed by response surface method, and an efficient catalyst (Fe@BC) was obtained. Fe@BC can effectively activate sodium persulfate (PS) and degrade three synthetic azo dyes (Methyl orange (MO), Amino black 10B (AB10B), and Orange II) and rhodamine B (RhB). Under the optimum conditions, the removal rate of total organic carbon of these four dyes reached 41.1%–89.8% and the final degradation rate could reach 100%. The physicochemical properties of Fe@BC were studied by SEM, BET, XRD, XPS and TGA. The results revealed that the specific surface area of Fe@BC was 195.6m2/g. Further, reducing iron oxide by C generated C0.09Fe1.91 and zero‐valent iron. Free radical scavenging experiments and electron paramagnetic resonance (EPR) measurements showed that the main reactive oxide species (ROS) in the Fe@BC/PS system were hydroxyl radicals (•OH) and singlet oxygen (1O2). Finally, Several Fe@BC modification systems were explored, the optimum pH of Fe@BC/PS system was analyzed, and the effects of Fe@BC and PS dosage on degradation performance were also studied. This study provides a scientific basis for the production of efficient catalysts and biochar energy, and an effective treatment scheme for printing and dyeing wastewater.

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“…Straw returning to fields is a widely used agricultural practice to enhance soil fertility and increase the organic matter content, − which leads to lower CO 2 emissions and alleviates air pollution problems compared to straw burning . An 8 year field experiment indicated that the physical, chemical, and biological properties of soil were considerably improved after the application of rice straw in an upland cropping system .…”

Section: Introductionmentioning

confidence: 99%

Ferrous Iron Addition Decreases Methane Emissions Induced by Rice Straw in Flooded Paddy Soils

Sun

et al. 2020

ACS Earth Space Chem.

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Straw returning to fields is a common agricultural practice for enhancing soil fertility and organic matter, although it induces substantial CH 4 emissions from flooded paddy soils. The characteristics of long-term periodic management of irrigation and drainage intensely affect the redox cycling of iron in paddy soil and could be one of the major factors regulating CH 4 production. Currently, this regulatory effect is rarely applied to CH 4 mitigation during straw returning to fields. To clarify the influences of iron on CH 4 emissions induced by straw incorporation, an laboratory incubation experiment was conducted with the addition of rice straw and two different concentration levels of ferrous iron (3.7 and 7.4 g of Fe 2+ kg −1 of soil) to two paddy soils (collected from Luotian, Hubei Province, and Changsha, Hunan Province, China, hereafter called LT and CS soils, respectively). Our result showed that CH 4 emissions from straw addition treatment were 125.4 and 45.5 times greater than the amount without straw addition in LT and CS soils, respectively. Fe 2+ addition significantly decreased CH 4 emissions induced by rice straw by over 50% in both soil samples. Moreover, the stimulation of straw on CH 4 emission was almost offset by twice the content of Fe 2+ amendment in LT soil. Fe 2+ addition significantly decreased the dissolved organic carbon (DOC) content, with 21−39% in LT soil and 31−42% in CS soil, compared to the straw addition treatment. The Fe(II) accumulation rate, microbial biomass carbon content, and CO 2 emissions were also suppressed by Fe 2+ addition. These results indicate that the addition of Fe 2+ suppressed the reduction of Fe(III) to Fe(II), leading to less DOC release from Fe−organic matter associations. The microbial activity and biomass could be influenced by the DOC availability, leading to further inhibition of CH 4 emissions. Our result implies that Fe-rich soils may be more suitable for returning straw, and further research about methanogens and methanotrophs is needed.

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The variability and causes of organic carbon retention ability of different agricultural straw types returned to soil

Cited by 21 publications

References 69 publications

Soil Organic Matter Degradation in Long-Term Maize Cultivation and Insufficient Organic Fertilization

Soil Organic Matter Degradation in Long-Term Maize Cultivation and Insufficient Organic Fertilization

Activation of persulfate by iron‐loaded soybean straw biochar for efficient degradation of dye contaminants: Synthesis, performance, and mechanism

Ferrous Iron Addition Decreases Methane Emissions Induced by Rice Straw in Flooded Paddy Soils

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