Soil-specific effects of urea addition on mineralization of aromatic and proteinaceous components of humic-like substances in three agricultural soils
Soil-specific effects of urea addition on mineralization of aromatic and proteinaceous components of humic-like substances in three agricultural soils
复制标题
添加尿素对三种农业土壤中腐殖质类芳香族和蛋白质成分矿化的土壤特异性影响
DOI：
10.1007/s00374-015-1008-1
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发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Yan, Xiaoyuan
中科院分区：
文献类型：
--
作者：
Shan, Jun;Ji, Rong;Yan, Xiaoyuan
腐殖物质是土壤有机碳中含量最丰富的组分。在农业土壤中大量施用无机氮肥会改变HS的稳定性和周转，从而改变C的固定。以14C标记的类腐殖物质（14C标记在芳香族或蛋白质组分中）为模型HS，研究了尿素添加量（0.1和0.2 mg N g− 1土）对3种土壤类型（人为土、潮土和潮土）中HS芳香族和蛋白质组分矿化和转化的影响。结果表明，尿素对土壤中芳香族和蛋白质的矿化没有影响，而对潮土中芳香族和蛋白质的矿化有显著的抑制作用（P< 0.05）。尿素添加量（0.2 mg N g− 1土）显著（P< 0.05）刺激了潮土中芳香组分（8.1%）和蛋白质组分（9.0%）的矿化。施用尿素后，3种供试土壤中溶解性有机质（DOM）中14 C的含量均降低，这可能是由于尿素抑制了将类腐殖物质结合到DOM中的特定微生物种类。添加尿素后土壤中类腐殖物质矿化与已报道的土壤有机碳变化规律一致，表明添加尿素对土壤有机碳某些组分的可变影响可能是导致无机氮肥添加引起土壤有机碳含量变化的部分原因。
Humic substances (HS) are the most abundant components of soil organic carbon (SOC). Intensive use of inorganic N fertilizers in agricultural soils can alter stability and turnover of HS and hence C sequestration. Using specifically14C-labeled humic-like substances (14C labeled in the aromatic or the proteinaceous component) as model HS, the effects of urea addition (0.1 and 0.2 mg N g−1soil) on mineralization and transformation of the aromatic and proteinaceous components of HS in three soil types (Anthrosols, Fluvisols, and Chernozems) were investigated. Our results showed that the urea addition had no effect on the mineralization of the aromatic and the proteinaceous components in the Anthrosol, whereas it significantly (P< 0.05) inhibited (13.1–17.7 %) the mineralization of the two components in the Fluvisol. Urea addition (0.2 mg N g−1soil) significantly (P< 0.05) stimulated the mineralization of the aromatic (8.1 %) and the proteinaceous (9.0 %) components in the Chernozem. The amounts of14C in dissolved organic matter (DOM) in the three tested soils were reduced after urea addition, probably because specific microbial species incorporating humic-like substances into DOM were inhibited by urea. The soil-specific humic-like substances mineralization after urea addition is consistent with the reported SOC change patterns of soil, indicating that the variable effects of urea addition on certain components of SOC could be partly responsible for changes in SOC contents induced by inorganic N fertilizers addition.
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影响因子：
9.7
作者：
Saiya-Cork, KR;Sinsabaugh, RL;Zak, DR
通讯作者：
Zak, DR
影响因子：
9.7
作者：
A. Kappler;R. Ji;A. Brune
通讯作者：
A. Kappler;R. Ji;A. Brune
影响因子：
--
作者：
J. Bollag;J. Dec;P. Huang
通讯作者：
J. Bollag;J. Dec;P. Huang
影响因子：
64.8
作者：
Neff, JC;Townsend, AR;Bowman, WD
通讯作者：
Bowman, WD
影响因子：
4
作者：
Schlesinger, WH;Andrews, JA
通讯作者：
Andrews, JA