Bacteria Affect the Distribution of Soil-Dissolved Organic Matter on the Slope: A Long-Term Experiment in Black Soil Erosion

Shanshan Cai, Wei Wang, Lei Sun (), Yumei Li, Zhiling Sun, Zhongchao Gao, Jiuming Zhang, Yan Li and Dan Wei ()
Additional contact information
Shanshan Cai: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Wei Wang: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Lei Sun: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Yumei Li: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Zhiling Sun: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Zhongchao Gao: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Jiuming Zhang: Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China
Yan Li: Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
Dan Wei: Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China

Agriculture, 2024, vol. 14, issue 3, 1-13

Abstract: Soil erosion results in dissolved organic matter (DOM) loss and is one of the main paths of soil carbon loss. Bacteria affect the generation and transformation of DOM. However, the effect of bacteria on the composition and slope distribution of DOM has rarely been investigated under field conditions. Based on a long-term experiment of three gradients (3°, 5°, 8°) in a black soil erosion area of Northeast China, the content, composition, and source of DOM were studied. The results showed that the DOM of the 3° and 5° slope was enriched midslope, and the DOM of the 8° slope was enriched downslope. Parallel factor (PARAFAC) analysis indicated that the main substances in DOM were fulvic-like acid, humic-like acid, tryptophan-like protein, and soluble microbial metabolites. The upslope and downslope soils of 3° and 5° slopes showed high DOM bioavailability, while the downslope soil of the 8° slope showed high DOM bioavailability. The content of new DOM in downslope soil increased with the gradient. Bacteria played an important role in the synthesis and transformation of DOM and affected its composition and slope distribution. Verrucomicrobiota, Firmicutes, Planctomycetota, and Gemmatimonadota were the main factors affecting soil DOM. The results could be helpful in understanding the loss mechanism of DOM in eroded black soil and provide support for soil carbon sequestration.

Keywords: dissolved organic matter; black soil; slope; bacteria; fluorescence spectrum (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2077-0472/14/3/352/pdf (application/pdf)
https://www.mdpi.com/2077-0472/14/3/352/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:14:y:2024:i:3:p:352-:d:1343733

Access Statistics for this article

Agriculture is currently edited by Ms. Leda Xuan

More articles in Agriculture from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().