[Effects of Carbon-based Fertilizer on Soil Physical and Chemical Properties, Enzyme Activities and Microbial Communities in Maize Fields in Arid Regions].

Q2 Environmental Science
Wei-Fan Liu, Xiao-Gang Wang, Ji-Li Liu, Na Wu, Meng-Hu Wan, Feng-Lan Ma, Hao Liu
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引用次数: 0

Abstract

This study investigates the impact of biochar-based fertilizer on soil environmental factors and microbial communities to address how biochar-based fertilizer can improve soil conditions in arid regions and promote sustainable agricultural development. To achieve these goals, maize "Xianyu 335" was selected as the test variety and a random block design was adopted to set up five treatments: CK (conventional fertilizer at 450 kg·hm-2), T1 (biochar-based fertilizer at 1 125 kg·hm-2), T2 (biochar-based fertilizer at 1 013 kg·hm-2), T3 (biochar-based fertilizer at 900 kg·hm-2), and T4 (biochar-based fertilizer at 788 kg·hm-2). Soil samples were collected from mature corn fields and analyzed for changes in soil physicochemical properties, soil enzyme activities, and microbial diversity under the different biochar-based fertilizer treatments. The results showed that: ① Compared with that using chemical fertilizer alone, the application of biochar-based fertilizer significantly reduced the soil bulk density, increased the soil porosity and field water capacity, and increased the soil nutrients and enzyme activities. The contents of organic carbon, total nitrogen, and total phosphorus in the T1 and T2 treatments were significantly increased by 13.68%-32.63%, 25.00%-26.79%, and 35.00%-47.50%, respectively. The activities of urease, sucrase, and alkaline phosphatase were significantly increased by 49.04%-91.35%, 48.88%-58.71%, and 20.69%-31.03%, respectively. ② The T3 and T4 treatments reduced the Chao1, Shannon, Simpson, Faith_pd, and Pielou_e indices of microorganisms. The dominant bacteria of each treatment were Proteobacteria, Actinobacteria, and Acidobacteria, with relative abundances ranging from 71.50%-86.66%. The T1 and T2 treatments significantly increased the relative abundance of Proteobacteria and Actinomycetes and decreased the relative abundance of Acidobacteria. No significant difference was observed in the relative abundance of amino acid metabolism, carbohydrate metabolism, energy metabolism, genetic information processing, and metabolic function, all of which were between 18.12% and 21.34%. ③ Correlation analysis showed that in addition to soil bulk density, soil physical properties, soil nutrients, and soil enzymes were significantly positively correlated with each other, and significant differences were present in the relationship between different dominant bacteria and soil environmental factors. The six functional pathways of microorganisms were significantly positively correlated with soil nutrients. PLS-SEM analysis showed that biochar-based fertilizer directly or indirectly affected the microbial community by regulating soil physical properties, soil nutrients, and soil enzymes, and soil nutrients were the main driving parameters of soil microbial community succession. Finally, PCA analysis showed that the comprehensive fertility of soil was T2>T1>T3>CK>T4. Overall, biochar-based fertilizer improved the physical, chemical, and biological properties of soil in arid regions, thereby enhancing soil fertility. A biochar-based fertilizer application rate of 1 013-1 125 kg·hm-2 is recommended for promoting corn cultivation in arid areas.

[碳基化肥对干旱地区玉米田土壤理化性质、酶活性和微生物群落的影响]。
本研究旨在探讨生物炭基肥料对土壤环境因子和微生物群落的影响,探讨生物炭基肥料如何改善干旱地区土壤条件,促进农业可持续发展。为实现这一目标,以玉米“鲜育335”为试验品种,采用随机区组设计,设置5个处理:CK(常规肥450 kg·hm-2)、T1(生物炭肥1 125 kg·hm-2)、T2(生物炭肥1 013 kg·hm-2)、T3(生物炭肥900 kg·hm-2)、T4(生物炭肥788 kg·hm-2)。在玉米成熟田采集土壤样品,分析不同生物炭基肥料处理下土壤理化性质、土壤酶活性和微生物多样性的变化。结果表明:①与单独施用化肥相比,施用生物炭基肥显著降低了土壤容重,增加了土壤孔隙度和田间容水量,提高了土壤养分和酶活性。T1和T2处理的有机碳、全氮和全磷含量分别显著提高了13.68% ~ 32.63%、25.00% ~ 26.79%和35.00% ~ 47.50%。脲酶、蔗糖酶和碱性磷酸酶活性分别显著提高了49.04% ~ 91.35%、48.88% ~ 58.71%和20.69% ~ 31.03%。②T3和T4处理降低了微生物的Chao1、Shannon、Simpson、Faith_pd和Pielou_e指数。各处理的优势菌群为变形菌门(Proteobacteria)、放线菌门(Actinobacteria)和酸性菌门(Acidobacteria),相对丰度在71.50% ~ 86.66%之间。T1和T2处理显著提高了变形菌门和放线菌门的相对丰度,显著降低了酸性菌门的相对丰度。氨基酸代谢、碳水化合物代谢、能量代谢、遗传信息加工和代谢功能的相对丰度均在18.12% ~ 21.34%之间,差异不显著。③相关分析表明,除土壤容重外,土壤物理性质、土壤养分、土壤酶之间均呈显著正相关,不同优势菌与土壤环境因子之间的关系存在显著差异。微生物的6种功能途径与土壤养分呈显著正相关。PLS-SEM分析表明,生物炭基肥料通过调节土壤物理性质、土壤养分和土壤酶直接或间接影响土壤微生物群落,土壤养分是土壤微生物群落演替的主要驱动参数。最后,PCA分析表明,土壤综合肥力为T2>;T1>T3>CK>T4。总体而言,生物炭基肥料改善了干旱区土壤的物理、化学和生物特性,从而提高了土壤肥力。推荐以1 013 ~ 1 125 kg·hm-2的生物炭基肥料施用量促进干旱地区玉米种植。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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