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The role of non‐crystalline Fe in the increase of SOC after long‐term organic manure application to the red soil of s outhern C hina
Author(s) -
Zhang J. C.,
Zhang L.,
Wang P.,
Huang Q. W.,
Yu G. H.,
Li D. C.,
Shen Q. R.,
Ran W.
Publication year - 2013
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/ejss.12104
Subject(s) - chemistry , manure , fertilizer , nitrogen , soil carbon , red soil , magic angle spinning , environmental chemistry , soil water , agronomy , nuclear magnetic resonance spectroscopy , soil science , organic chemistry , geology , biology
Summary Because of the important role of soil organic carbon ( SOC ) in nutrient cycling and global climate changes, there has been an interest in understanding how different fertilizer practices affect the SOC preservation and promotion. The results from this study showed that long‐term application of manure (21 years) could increase significantly the content of SOC , total nitrogen ( N ) and soil pH in the red soil of s outhern C hina. The chemical structure of SOC was characterized by using solid‐state cross‐polarization magic angle spinning ( CPMAS ) 13 C nuclear magnetic resonance ( NMR ) spectroscopy, and the aromatic C , ratio of alkyl C : O ‐alkyl C , aromaticity and hydrophobicity of mineral fertilizers N, P and K plus organic manure ( NPKM ) and organic manure ( M ) treatments were less than those of mineral fertilizer nitrogen (N) and mineral fertilizers N, P and K ( NPK ) treatments. Both poorly crystalline ( Fe o ) and organically complexed ( Fe p ) iron contents were influenced significantly ( P < 0.05) by different fertilizers, and it was observed that NPKM and M treatments increased the non‐crystalline Fe ( Fe o ‐ Fe p ) content. There was a significant ( P < 0.01) positive correlation between soil organic C and non‐crystalline Fe in both the surface (0–20 cm) and subsurface (20–40 cm) soils. The results suggested that non‐crystalline Fe played an important role in the increase of SOC by long‐term application of organic manure ( NPKM and M ) in the red soil of s outhern C hina.