Preliminary Research on Agricultural Cultivation Decreasing Amino Sugar Accumulation in Calcareous Soils in Subtropical Karst Region of China

Mengxia Zhou, Hui Yang (), Tongbin Zhu, Cheng Zhang and Degen Zhu
Additional contact information
Mengxia Zhou: Karst Dynamics Laboratory, MNR and Guangxi, Institute of Karst Geology, CAGS, Guilin 541004, China
Hui Yang: Karst Dynamics Laboratory, MNR and Guangxi, Institute of Karst Geology, CAGS, Guilin 541004, China
Tongbin Zhu: Karst Dynamics Laboratory, MNR and Guangxi, Institute of Karst Geology, CAGS, Guilin 541004, China
Cheng Zhang: Karst Dynamics Laboratory, MNR and Guangxi, Institute of Karst Geology, CAGS, Guilin 541004, China
Degen Zhu: Karst Dynamics Laboratory, MNR and Guangxi, Institute of Karst Geology, CAGS, Guilin 541004, China

Land, 2022, vol. 11, issue 10, 1-12

Abstract: Soil microbial residues play an important role in the formation and stabilization of soil organic matter and can be quantitatively characterized by amino sugars. However, the response of soil microbial residues to agricultural cultivation in karst areas remains unclear. In this study, we collected soil samples from natural reserved land as well as five plantation forests dominated by Citrus trees cultivated for 0, 1, 5, 15, 30 years to examine the effects of agricultural cultivation on the content of microbial residues (amino sugar analysis). Results showed that: (1) Soil Amino Sugars (ASs) contents were significantly reduced after agricultural cultivation along with the sharp decrease in soil organic carbon (SOC). After 30 years of cultivation, the contents of total ASs, glucosamine (GluN), galactosamine (GalN), and muramic acid (MurA) in cultivated soils decreased by 58.22%, 55.30%, 27.11%, respectively, compared with 0 yr.; (2) Microbial residual carbon contribution to SOC increased from 34.11% to 81.33% after 30 years of cultivation, including fungal residual carbon (FRC) (25.79% to 48.6%) and bacterial residual carbon (BRC) (8.32% to 32.72%); (3) Soil GluN/MurA values tended to decrease with increasing cultivation years. The results highlight the significant effect of cultivation years on amino sugar accumulation. It indicates that the years of reclamation in karst areas have different impacts on the organic fractions derived from various microbial communities in the soil organic matter pool, and the microbial residues indicated by amino sugar are of great significance for the interception of soil organic matter.

Keywords: amino sugar; agricultural cultivation; microbial residue; soil organic carbon; karst area (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2073-445X/11/10/1684/pdf (application/pdf)
https://www.mdpi.com/2073-445X/11/10/1684/ (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:jlands:v:11:y:2022:i:10:p:1684-:d:928667

Access Statistics for this article

Land is currently edited by Ms. Carol Ma

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