我国典型茶园土壤自养和异养硝化作用及其微生物驱动机制

批准号:
41977081
项目类别:
面上项目
资助金额:
61.0 万元
负责人:
程谊
依托单位:
学科分类:
土壤侵蚀与土壤肥力
结题年份:
2023
批准年份:
2019
项目状态:
已结题
项目参与者:
程谊
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中文摘要
茶树喜酸好铝、喜铵厌硝、以及土壤不断酸化这些特性决定了其拥有复杂的土壤硝化机制。长期施铵态氮肥刺激自养硝化而致酸,土壤酸化反过来会抑制自养硝化。土壤呈酸性且不断被酸化又为异养硝化的发生提供了机会。此外,凋落物的返还以及有机肥的施入又会带入大量的碳源,这将进一步提高异养硝化速率。然而,至今尚不清楚茶园土壤的硝化途径及其微生物机制。本项目将以我国典型茶园土壤(根际与非根际)为研究对象,采用15N稀释和示踪、乙炔抑制、选择性微生物抑制剂、现代分子生物学和土壤-植物系统15N标记分析模型技术相结合的方法,明确我国典型茶园土壤自养和异养硝化速率及其各自的控制因子;阐明凋落物返还以及化学肥和有机肥投入对土壤硝化途径的影响;揭示茶园土壤硝化尤其异养硝化的微生物机制;探明土壤-茶树系统中自养和异养硝化速率的实际大小,以期为采取措施控制茶园土壤硝化和酸化、提高氮肥利用率和降低氮损失提供理论依据和技术支持。
英文摘要
Tea is a special crop that requires acidic soil and, in turn, acidifies the soil, and at the same time prefers NH4+, which may result in a particularly complex mechanisms of soil nitrification in tea orchard. On the one hand, repeated NH4+-based N application can cause severe soil acidification, possibly because of protons generated from increasing autotrophic nitrification, which may in turn inhibit autotrophic nitrification. On the other hand, acidic soil and continuous soil acidification with planting age may provide a possibility for heterotrophic nitrification. Both return of tea litter and application of organic fertilizer can increase carbon availability, which may further enhance heterotrophic nitrification rate. However, the relative contribution of heterotrophic and autotrophic nitrification to total nitrification in tea garden soil and their control factors and microbial mechanisms remains largely unclear. In this project, 15N dilution and tracing techniques in combination with selective biomass inhibitors, C2H2 inhibition, modern molecular biotechnology and soil-plant system coupled with 15N model will be employed to calculate soil heterotrophic and autotrophic nitrification rates and related mechanism of microbiology in typical tea orchard soils (rhizosphere and non-rhizosphere) in China. The purposes are to 1) investigate soil heterotrophic and autotrophic nitrification rates and their controlling factors; 2) characterize the effects of the added organic and chemical fertilizers, and return of litter on soil heterotrophic and autotrophic nitrification rates; 3) reveal the microbial driving mechanism of soil nitrification especially heterotrophic nitrification in tea garden; 4) explore the actual rates of autotrophic and heterotrophic nitrification in the soil-tea system. These results will provide theoretical basis and technical support for taking targeted measures to control soil nitrification and acidification of tea orchard, improve nitrogen use efficiency and at the same time lower nitrogen losses, and finally promote the sustainable development of tea garden soil.
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DOI:doi.org/10.1016/j.jenvman.2020.111599
发表时间:2021
期刊:Journal of Environmental Management
影响因子:8.7
作者:Ahmed S. Elrys;El-Sayed M. Desoky;Manal A. Alnaimy;Huimin Zhang;Jin-bo Zhang;Zu-cong Cai;Yi Cheng
通讯作者:Yi Cheng
DOI:10.1111/gcb.15883
发表时间:2021-09-23
期刊:GLOBAL CHANGE BIOLOGY
影响因子:11.6
作者:Elrys, Ahmed S.;Wang, Jing;Mueller, Christoph
通讯作者:Mueller, Christoph
Effects of ammonium-based nitrogen addition on soil nitrification and nitrogen gas emissions depend on fertilizer-induced changes in pH in a tea plantation soil
添加铵基氮对土壤硝化和氮气排放的影响取决于肥料引起的茶园土壤 pH 值的变化
DOI:10.1016/j.scitotenv.2020.141340
发表时间:2020
期刊:Science of the Total Environment
影响因子:9.8
作者:Wang Jing;Tu Xiaoshun;Zhang Huimin;Cui Jingya;Ni Kang;Chen Jinlin;Cheng Yi;Zhang Jinbo;Chang Scott X.
通讯作者:Chang Scott X.
DOI:10.1111/gcb.15851
发表时间:2021-08-29
期刊:GLOBAL CHANGE BIOLOGY
影响因子:11.6
作者:Elrys, Ahmed S.;Ali, Ahmad;Chang, Scott X.
通讯作者:Chang, Scott X.
DOI:10.1007/s00374-022-01680-7
发表时间:2022-11
期刊:Biology and Fertility of Soils
影响因子:6.5
作者:Jing Wang;Qiao Huang;Yong Li;Xiaoshun Tu;Zhaoxiong Chen;Ahmed S. Elrys;Yi Cheng;Lifeng Ma
通讯作者:Jing Wang;Qiao Huang;Yong Li;Xiaoshun Tu;Zhaoxiong Chen;Ahmed S. Elrys;Yi Cheng;Lifeng Ma
外源碳对旱地土壤硝态氮同化速率的影响及其作用机理
- 批准号:41671231
- 项目类别:面上项目
- 资助金额:66.0万元
- 批准年份:2016
- 负责人:程谊
- 依托单位:
国内基金
海外基金
