dc.contributor.author |
Bore E. |
|
dc.contributor.author |
Kuzyakov Y. |
|
dc.contributor.author |
Dippold M. |
|
dc.date.accessioned |
2020-01-21T20:33:32Z |
|
dc.date.available |
2020-01-21T20:33:32Z |
|
dc.date.issued |
2019 |
|
dc.identifier.issn |
0038-0717 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/157432 |
|
dc.description.abstract |
© 2018 Transformation of sugars by microorganisms is a key process influencing carbon (C) stabilization in soil. To reveal the mechanisms responsible for the persistence of labile C in soil, the fates of position-specific and uniformly 13 C labeled glucose and ribose were studied under field conditions for 800 days. We hypothesized a convergence of the fate of individual C positions and substances because of the long-term C recycling by microorganisms. Position-specific data revealed that both sugars were simultaneously metabolized via glycolysis and the pentose phosphate pathway (PPP). The position-specific 13 C recovery pattern in soil and in microbial biomass was similar. This similarity demonstrated significant contribution of microbial products and necromass to soil organic matter (SOM) formation. Based on a biexponential model, the mean residence times (MRTs) of glucose C-6 and ribose C-5 in the soil were longer than the other C positions. However, the MRT of uniformly labeled 13 C from ribose in the soil was 3 times longer than that from glucose. Consequently, ribose and glucose were incorporated into different cellular components, defining their long-term fate in soil. The convergence of glucose C positions in soil and microbial biomass revealed that recycling and modification of recycled components dominated glucose transformation. In contrast, divergence of ribose C positions in soil revealed that intact ribose-derived cell components are reused or preserved in SOM. Thus, convergence versus divergence of individual C positions distinguished the two key stabilization mechanisms explaining the long persistence of C from easily available sources in the soil: sustained microbial recycling (convergence) versus preservation (divergence) in long-term stabilized compound classes. |
|
dc.relation.ispartofseries |
Soil Biology and Biochemistry |
|
dc.subject |
Labile C |
|
dc.subject |
Metabolic tracing |
|
dc.subject |
Microorganisms |
|
dc.subject |
Necromass |
|
dc.subject |
Preservation |
|
dc.subject |
Recycling |
|
dc.title |
Glucose and ribose stabilization in soil: Convergence and divergence of carbon pathways assessed by position-specific labeling |
|
dc.type |
Article |
|
dc.relation.ispartofseries-volume |
131 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.relation.startpage |
54 |
|
dc.source.id |
SCOPUS00380717-2019-131-SID85059550436 |
|