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枸杞枝條發(fā)酵木質(zhì)纖維素降解與微生物群落多樣性研究
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國家自然科學基金項目(31501803)和寧夏農(nóng)林科學院科技創(chuàng)新先導資金項目(NKYQ—16—05)


Characteristics of Degradation of Lignocellulose and Microbial Community Diversity during Fermentation of Wolfberry Branches Substrate
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    摘要:

    為探討枸杞枝條基質(zhì)化發(fā)酵中木質(zhì)纖維素降解、微生物群落代謝能力及多樣性特征,采用正交試驗設計,,以枸杞枝條粉和苦豆子莖稈粉質(zhì)量比為4∶1混合為試材,采用Biolog—ECO鑒定方法,,研究不同發(fā)酵因子對枸杞枝條基質(zhì)化發(fā)酵中微生物群落結構和多樣性的影響,。結果表明:發(fā)酵結束時,枸杞枝條基質(zhì)纖維素,、半纖維素和木質(zhì)素降解率分別在15%,、19%及10%以上;木質(zhì)纖維素降解率在溫度為60℃、含水率為60%,、添加油餅氮源及接種粗纖維素降解菌處理條件下較高,,其中纖維素、半纖維素和木質(zhì)素降解率分別在18.12%~19.22%,、23.55%~25.21%和13.87%~14.24%范圍內(nèi),,顯著高于其他處理;該處理增加了枸杞枝條基質(zhì)發(fā)酵高溫期時微生物的活性和多樣性,平均顏色變化率分別為1.019,、1.062,、0.943和1.117,微生物多樣性香濃指數(shù),、優(yōu)勢度指數(shù)和豐富度指數(shù)分別在2.321~2.365,、0.930~0.941和18.78~20.33范圍內(nèi),提高了枸杞枝條粉堆體中微生物對部分碳源的代謝能力,,從而可促使有機質(zhì)降解,。

    Abstract:

    The Chinese wolfberry branch, normally as agricultural wastes, is one of the most important renewable and reuseable resources of plant fibers in Ningxia. To improve the efficiency of wolfberry branch utilization, the characteristics of lignocellulose degradation, microbial community metabolism and diversity were studied during the fermentation of wolfberry branches substrate. By design of orthogonal experiment, wolfberry powder branches and sophora alopecuroides stem powder mixed in ratio of 4∶1 were used to study the influence of fermentative factors on microbial community structure and diversity during the fermentation by Biolog—ECO system. The results showed that at the end of the fermentation, the degradation rates of cellulose, hemicellulose and lignin were stayed above 15%, 19% and 10%, respectively. The treatment, which added oil cake and inoculated with coarse cellulose degrading bacteria, got the higher degradation rates of lignocellulose at temperature of 60℃, moisture content of 60%, and the degradation rates of cellulose, hemicellulose and lignin were 18.12%~19.22%, 23.55%~25.21% and 13.87%~14.24%, respectively, which were increased significantly than those of the other treatments;microbial activity and diversity during high temperature period were increased. Average well color development of microbes were 1.019, 1.062, 0.943 and 1.117, and Shannon—Wiener index, Simpson index and richness index of microbes were 2.321~2.365, 0.930~0.941 and 18.78~20.33, respectively. The ability to metabolize microorganism on part of carbon source was improved, which resulted in promoting degradation of organic matter.

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馮海萍,楊冬艷,白生虎,謝華,劉曉梅,裴紅霞.枸杞枝條發(fā)酵木質(zhì)纖維素降解與微生物群落多樣性研究[J].農(nóng)業(yè)機械學報,2017,48(5):313-319,334. FENG Haiping, YANG Dongyan, BAI Shenghu, XIE Hua, LIU Xiaomei, PEI Hongxia. Characteristics of Degradation of Lignocellulose and Microbial Community Diversity during Fermentation of Wolfberry Branches Substrate[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(5):313-319,,334.

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  • 收稿日期:2017-03-13
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  • 在線發(fā)布日期: 2017-05-10
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