权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Sequestration of microbial, aged and pyrogenic N during paddy soil development

水稻土发育过程中微生物、老化和热解氮的固存

基本信息

批准号：
60208935
负责人：
Professor Dr. Wulf Amelung
金额：
--
依托单位：
Institute of Soil Science
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/60208935?language=en
关键词：
Sequestration microbial aged pyrogenic during

项目摘要

Although paddy soils exhibit low N use efficiency, the results from the 1st phase of this Research Unit suggested that they may sequester significant amounts of N in microbial residues and aged amino acids. In addition, we observed an accumulation of charred organic matter with yet unknown contribution to total N content. We suggest that mainly bacteria sequester N in their cell walls. While this process is efficient in the surface soils, in subsoils an effective mechanism for N storage seems to be missing. To which degree such processes also hold true for paddy soils formed from different parent materials and under different climatic regimes is unclear. Subproject will thus continue to use amino sugars and amino acid enantiomers in combination with compound-specific isotopic measurements to elucidate the microbial transformation and natural ageing of these hydrolysable SON forms during paddy soil formation and preservation. Besides, we will try to identify black N forms. In particular we aim at identifying (i) characteristic SON decomposition patterns within the different paddy soil profiles, (ii) pools of different amino acid, non-hydrolyzable N and microbial residue N accumulation, and (iii) the transformation rates of hydrolysable N in dependency of soil type. The N-cycling using biomarkers is assessed (iv) in the short-term using the 15N content of soil amino sugars after fertilizing with 15N urea, and (v) in the medium – to long-term by Δ14C tracing of bomb C in microbial residues and amino acids in the paddy soils of different mineralogy.

虽然水稻土表现出较低的氮利用效率，从本研究单位的第一阶段的结果表明，他们可能会螯合显着数量的N微生物残留物和老化的氨基酸。此外，我们观察到积累的烧焦的有机物，但未知的贡献，总氮含量。我们认为，主要是细菌螯合N在他们的细胞壁。虽然这一过程是有效的表层土壤，在底土的有效机制，氮储存似乎是失踪。这种过程在何种程度上也适用于不同母质和不同气候条件下形成的水稻土，尚不清楚。因此，子项目将继续使用氨基糖和氨基酸对映异构体结合化合物特定的同位素测量，以阐明微生物转化和自然老化的这些水解SON形式在水稻土形成和保存。此外，我们将尝试识别黑色N形式。特别是，我们的目标是确定（一）在不同的水稻土剖面特征SON分解模式，（二）不同的氨基酸，非水解N和微生物残留N积累的池，和（iii）水解N的转化率依赖于土壤类型。利用生物标志物对氮循环进行了评价：（iv）在短期内利用15 N尿素处理后土壤氨基糖中的15 N含量进行评价;（v）在中长期内利用Δ 14 C示踪不同矿物类型水稻土中微生物残留物和氨基酸中的碳弹C。