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Soil microbiome-induced changes in the priming effects of 13C-labelled substrates from rice residues.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.scitotenv.2020.138562
Yi-Min Wang 1 , Ming Li 2 , Chun-Yu Jiang 3 , Ming Liu 3 , Meng Wu 3 , Ping Liu 3 , Zhong-Pei Li 3 , Minori Uchimiya 4 , Xu-Yin Yuan 1
Affiliation  

Knowledge gap exists to understand the soil CO2 emission and microbial group response to substrates of whole plant residues and derived biochar. We used 13C-labelled substrates (rice straw, roots and biochar) to track influences of their decomposition on soil priming effect (PE) and phospholipid fatty acid (PLFA) composition during one-year incubation. Organic substrates at 1% (w/w) level increased soil pH, available nitrogen (AN) and available phosphorus (AP), especially during the first 45 days of incubation. After incubation, 44% of the added straw was mineralized to 13CO2, followed by roots (~35%) and biochar (~5%). Straw and roots amendment caused positive PE during 4-360 day of the incubation, where a lowest value of 41.9 mg C kg-1 was observed. Biochar amendment caused negative PE during 56-150 day of the incubation, where a largest value of -99.0 mg C kg-1 was observed. Analysis of 13C-labelled PLFA enabled the differentiation of microbial groups during substrates utilization. Gram positive bacteria (G+) and general bacteria groups were dominated in co-metabolizing both the native soil organic carbon (SOC) and substrates after straw and roots amendment. Gram negative bacteria (G-), especially identified by PLFA biomarkers cy17:0 and cy19:0, preferentially utilizes the 13C-labelled biochar but not promoting soil priming effect. Soil pH, SOC, AN and AP all explained changes of total and 13C-labelled PLFA contents (>75%, p < .05). Evidences showed that biochar is best in sequestering soil C pool, followed by straw and roots, and soil microbial groups in utilization of organic substances mediated SOC mineralization.

中文翻译:

土壤微生物组诱导的13 C标记的底物从稻米残留物中引发的变化。

存在知识鸿沟,以了解土壤CO2排放和微生物群对整株植物残渣和衍生生物炭基质的反应。我们使用了13C标记的底物(稻草,根和生物炭)来追踪它们在一年的培养过程中分解对土壤启动效果(PE)和磷脂脂肪酸(PLFA)组成的影响。浓度为1%(w / w)的有机底物会增加土壤的pH值,有效氮(AN)和有效磷(AP),尤其是在孵化的前45天。孵育后,将加入的秸秆中的44%矿化为13CO2,其次是根(〜35%)和生物炭(〜5%)。秸秆和根的修整在培养的4-360天期间导致PE呈阳性,其中观察到的最低值为41.9 mg C kg-1。生物炭修正在孵化56-150天期间导致PE阴性,其中观测到的最大值为-99.0 mg C kg-1。13C标记的PLFA的分析能够在底物利用过程中区分微生物。秸秆和根部改良后,革兰氏阳性细菌(G +)和一般细菌群体在共同代谢原生土壤有机碳(SOC)和基质方面占主导地位。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。13C标记的PLFA的分析能够在底物利用过程中区分微生物。秸秆和根部改良后,革兰氏阳性细菌(G +)和一般细菌群在共同代谢天然土壤有机碳(SOC)和基质方面占主导地位。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。13C标记的PLFA的分析能够在底物利用过程中区分微生物。秸秆和根部改良后,革兰氏阳性细菌(G +)和一般细菌群体在共同代谢原生土壤有机碳(SOC)和基质方面占主导地位。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。秸秆和根部改良后,革兰氏阳性细菌(G +)和一般细菌群体在共同代谢原生土壤有机碳(SOC)和基质方面占主导地位。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。秸秆和根部改良后,革兰氏阳性细菌(G +)和一般细菌群体在共同代谢原生土壤有机碳(SOC)和基质方面占主导地位。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。革兰氏阴性细菌(G-),尤其是通过PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。革兰氏阴性细菌(G-),尤其是由PLFA生物标记cy17:0和cy19:0识别的细菌,优先利用13C标记的生物炭,但不促进土壤启动作用。土壤的pH,SOC,AN和AP均解释了总的和13C标记的PLFA含量的变化(> 75%,p <.05)。有证据表明,生物炭最适合隔离土壤碳库,其次是秸秆和根,以及利用有机物介导的SOC矿化作用的土壤微生物群。
更新日期:2020-04-08
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