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Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
Published on: September 11, 2016
Biochemical fulvic acid mediates nutrients and microbial community structure in different textured sodic
Yan Sun1,2, Bingbing Wu1, Bowei Ren1
1State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China.
Background:
Sodic saline-alkali soils restrict agricultural productivity by limiting nutrient availability and disrupting microbial communities, yet their responses to biochemical fulvic acid (BFA) across sodic saline-alkali soils with different textures remain unclear.
Methods:
A 45-day controlled incubation experiment was conducted using sandy loam and loamy sand amended with BFA at 0, 1, 2, 4, and 8 g kg-2.
Results:
Responses to BFA differed between the two soils with different textures and among application rates and were most pronounced during the early incubation period. In sandy loam, 2 g·kg-1 BFA increased ammonium nitrogen and nitrate nitrogen by 68% and 53%, respectively, on day 15 relative to the control. In loamy sand, 1 g·kg-1 BFA increased nitrate nitrogen by 92% on day 15 and ammonium nitrogen by 70% on day 30. Sequencing analysis of soil samples collected on day 45 revealed distinct microbial community responses to 2 g·kg-1 BFA in sandy loam and 1 g·kg-1 BFA in loamy sand.
Results:
Within the conditions of this trial, the optimum application rates were 2 g·kg-1 in sandy loam and 1 g·kg-1 in loamy sand, corresponding to the most remarkable responses.
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