Study on the ecological potential of Chinese straw resources available for bioenergy producing based on soil protection functions

Zhu, Kaiwei; Liu, Zhen; Tan, Xianjun; Lin, Jie; Xu, Da

doi:10.1016/j.biombioe.2018.06.002

Cited by 20 publications

(5 citation statements)

References 27 publications

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“…Effects of hemicellulase and PAA pretreatment on host substrate preferences were further compared with their pathogenic fungi ( Table 1 ). In addition to the promising energy crop switchgrass (SG), wheat straw (WS) and rapeseed straw (RS) were used as representative residues of major monocot and dicot crops in Northwest China [ 17 , 18 ]. Wood branches were rich in certain areas and apple tree branch (AB) was selected as it has the largest production in non-forest areas in Northwest China [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Herbaceous and Woody Cell Wall Digestibility by Pathogenic Fungi

et al. 2021

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Fungal pathogens have evolved combinations of plant cell-wall-degrading enzymes (PCWDEs) to deconstruct host plant cell walls (PCWs). An understanding of this process is hoped to create a basis for improving plant biomass conversion efficiency into sustainable biofuels and bioproducts. Here, an approach integrating enzyme activity assay, biomass pretreatment, field emission scanning electron microscopy (FESEM), and genomic analysis of PCWDEs were applied to examine digestibility or degradability of selected woody and herbaceous biomass by pathogenic fungi. Preferred hydrolysis of apple tree branch, rapeseed straw, or wheat straw were observed by the apple-tree-specific pathogen Valsa mali, the rapeseed pathogen Sclerotinia sclerotiorum, and the wheat pathogen Rhizoctonia cerealis, respectively. Delignification by peracetic acid (PAA) pretreatment increased PCW digestibility, and the increase was generally more profound with non-host than host PCW substrates. Hemicellulase pretreatment slightly reduced or had no effect on hemicellulose content in the PCW substrates tested; however, the pretreatment significantly changed hydrolytic preferences of the selected pathogens, indicating a role of hemicellulose branching in PCW digestibility. Cellulose organization appears to also impact digestibility of host PCWs, as reflected by differences in cellulose microfibril organization in woody and herbaceous PCWs and variation in cellulose-binding domain organization in cellulases of pathogenic fungi, which is known to influence enzyme access to cellulose. Taken together, this study highlighted the importance of chemical structure of both hemicelluloses and cellulose in host PCW digestibility by fungal pathogens.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Herbaceous and Woody Cell Wall Digestibility by Pathogenic Fungi

et al. 2021

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“…The stress diagram of maize straw in the chopping process is shown in Figure 11. The relationship between F, θ, v , v, and mg is shown in Equation (8).…”

Section: The Rotational Velocity Of the Eccentric Disc And The Veloci...mentioning

confidence: 99%

“…Specifically, the poor chopping quality and the high fuel consumption are the problems of straw returning machinery. Good chopping quality is the key to enhancing seeding uniformity, promoting seed germination, and benefiting plant growth [8][9][10]. To improve the chopping quality of straw and reduce the energy consumption of the machine, many studies designed and optimized the structure of the machine.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment of a Reciprocating Intermittent Chopping Device for Maize Straw Returning

Lin

et al. 2022

Agriculture

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Straw returning has shown great advantages in residue management and soil protection in crop planting systems. Mechanized retention of straw is the primary straw returning method, which can reduce costs and improve efficiency. It is important to increase the chopping quality in the field of straw returning, because poor chopping quality will provoke a series of problems including seeding blockage. Straw chopping pass rate (CPR) is an important indicator to measure the chopping quality. Therefore, the CPR of straw should be improved during the chopping process. This paper introduced a novel maize straw chopping device. With the ground as the support, the maize straw was chopped rapidly in the vertical direction. The key parameters of the chopping device were determined by establishing mathematical models and kinematics simulation analysis methods via ADAMS. The effects of rotational velocity, installation positions of chopping units, and the tractor forward velocity on the CPR of maize straw and soil bulk density (SBD) were examined through the Box–Behnken design method. The test factors were the rotational velocities of the chopping units (RV, 550 rpm, 650 rpm, 750 rpm), the installation distance of the two chopping units (IDTCU, 480 mm, 600 mm, 720 mm), and the velocity of the tractor (VT, 3 km/h, 4 km/h, 5 km/h). The results showed that the maximum CPR value and better value of SBD were obtained under the RV of 610 rpm, the IDTCU of 526.8 mm, and the VT of 3.96 km/h. Finally, field validation experiments were conducted under the RV of 610 rpm, the IDTCU of 550 mm, and the VT of 4 km/h. The results showed that the CPR of maize straw was 92.0%, which was superior to the requirement as stipulated in the National Standards of China (CPR ≥ 85%). In addition, in 0–50 mm and 50–100 mm soil layers, the bulk density was decreased by 25.42% and 13.24%, respectively. These results become of considerable importance for crop production in China.

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“…However, under the climate condition of low temperature in northeast China, the corn cobs decompose slowly after returning to the field, which causes short-term soil acidification [7], affects crop root development, aggravates pests and diseases, and reduces the quality of spring sowing [8,9]. Therefore, in order to improve soil physical and chemical properties [10], combat soil erosion [11], promote crop growth, and increase crop yield [12,13], it is of great significance to explore the field decomposition characteristics of corn cobs under the conditions of corn kernel harvesting technology in northeast China.…”

Section: Introductionmentioning

confidence: 99%

Field Decomposition of Corn Cob in Seasonally Frozen Soil and Its Intrinsic Influencing Factors: The Case of Northeast China

Zou

Chen

et al. 2021

Agriculture

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Returning corn cobs to the field during corn kernel harvesting is an effective way to improve soil properties and increase crop yield. However, seasonally frozen soil seriously hinders the field decomposition process of corn cobs. To explore the decomposition characteristics and promote field decomposition, in this study, the nylon mesh bag method was used to perform field decomposition tests for 150 days. Fiber composition analysis and microstructure observation were carried out. The results showed that the field decomposition of corn cob was influenced by temperature, precipitation, and frozen soil environment. The 150-day cumulative decomposition rates of the pith, woody ring, and glume were 40.0%, 24.2%, and 36.3%, respectively. Caused by the difference in fiber compositions, the decomposition speeds of pith and glume were much higher than that of the woody ring. The complex microstructures of the pith, woody ring, and glume led to differences in the accessibility of cellulose, which indirectly influenced the field decomposition characteristics. The homogeneous sponge-like structure of the pith and glume increased the accessibility of cellulose and ultimately accelerated the field decomposition, while the compact lignocellulosic structure of the woody ring hindered the decomposition process. Compared with corn stalk, corn cob had similar or even better field decomposition characteristics and excellent application prospects.

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Study on the ecological potential of Chinese straw resources available for bioenergy producing based on soil protection functions

Cited by 20 publications

References 27 publications

Comparative Analysis of Herbaceous and Woody Cell Wall Digestibility by Pathogenic Fungi

Comparative Analysis of Herbaceous and Woody Cell Wall Digestibility by Pathogenic Fungi

Design and Experiment of a Reciprocating Intermittent Chopping Device for Maize Straw Returning

Field Decomposition of Corn Cob in Seasonally Frozen Soil and Its Intrinsic Influencing Factors: The Case of Northeast China

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