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- Title
Evolving characteristics of dissolved organic matter in soil profiles during 56 years of revegetation in Mu Us Sandy Land.
- Authors
Wang, Yixiang; Hu, Hanzhe; Zhou, Yajie; Zhang, Buran; Li, Shuo; Liu, Jun; Tong, Xiaogang
- Abstract
Background and aims: Dissolved organic matter (DOM) is a vital bioactive component in soil nutrient cycling. However, the dynamics of its characteristics and composition along the soil profile during desertification reversal are poorly understood. Methods: Soil samples were gathered from shrub and arbor forests that have been established for 25, 35, 46, and 56 years on semifixed sand of Mu Us Sandy Land. The evolution of DOM composition and chemical properties were explored by ultraviolet-visible and fluorescence spectrophotometry. Results: After 56 revegetation years, DOM increased significantly. In arbor lands, DOM was impacted mainly by dissolved organic carbon, with mean concentrations increasing from 58.89 mg·kg-1 to 131.95 mg·kg-1 in 0-100 cm soil profile. In the shrubland, changes in dissolved organic nitrogen were more remarkable, with mean concentrations increasing from 3.43 mg·kg−1 to 6.82 mg·kg−1 in 0-100 cm soil profile. Concurrently, as soil depth increased, noticeably decreased in the proportion of humic-like components within DOM, while protein-like components displayed an upward trend. The chemical properties of DOM in arbor lands display a higher proportion of hydrophobic substances along with an elevated aromaticity and humification degree. Conversely, in shrubland, the DOM composition exhibits a higher proportion of tryptophan components that are more available for microbial metabolism. Correlation analysis showed that DOM content and specific environmental factors (including soil depth, vegetation type, and afforestation age) profoundly affected soil DOM properties. Conclusions: The DOM in arbor land and surface soil layer were more humified and relatively stable. Conversely, the DOM in shrubland and deeper soil layers contains more bioactive substances for microbial utilization.
- Subjects
DISSOLVED organic matter; SOIL profiles; REVEGETATION; SOIL depth; HUMIFICATION
- Publication
Plant & Soil, 2024, Vol 497, Issue 1/2, p567
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-023-06414-8