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Temporal changes in soil organic carbon and aggregate-associated organic carbon after reclamation of abandoned, salinized farmland

Published online by Cambridge University Press:  13 July 2016

F. H. ZHANG ,
H. C. YANG ,
W. J. GALE ,
Z. B. CHENG  and
J. H. YAN
F. H. ZHANG*
Affiliation:
College of Agronomy, Shihezi University, Xinjiang Province 832003, China
H. C. YANG
Affiliation:
College of Agronomy, Shihezi University, Xinjiang Province 832003, China
W. J. GALE
Affiliation:
College of Agronomy, Shihezi University, Xinjiang Province 832003, China
Z. B. CHENG
Affiliation:
College of Agronomy, Shihezi University, Xinjiang Province 832003, China
J. H. YAN
Affiliation:
College of Agronomy, Shihezi University, Xinjiang Province 832003, China
*
*To whom all correspondence should be addressed. Email: zhangfenghua6088@126.com
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Summary

A field experiment was conducted to quantify changes in soil aggregation and aggregate-associated soil organic carbon (SOC) concentration 1, 3, 5 and 10 years after abandoned, salinized land in the Manasi River Basin was reclaimed for cotton (Gossypium hirsutum L.). Results showed that reclamation significantly increased SOC concentrations and SOC stocks. Specifically, 10 years of cotton production increased SOC concentrations by 45% in the 0–60 cm depth and SOC stocks by 35%. The SOC concentrations and stocks decreased as soil depth increased. Reclamation time, season and soil depth had significant interaction effects on SOC. The SOC concentrations were significantly and positively correlated with available soil nitrogen and available soil phosphorus. Compared with abandoned farmland, macro-aggregate-associated (>250 µm) SOC concentrations in the 0–60 cm depth increased by 47% after 5 years of cotton production and by 53% after 10 years of cotton production. The contribution of macro-aggregate-associated SOC to total SOC in the 0–60 cm depth increased by 87% after 5 years of cotton production and by 69% after 10 years of cotton production. The findings indicate that soil aggregates were more stable after abandoned, salinized farmland was reclaimed for cotton production. Furthermore, cotton production can increase SOC concentrations and sequester C in this arid area.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 155 , Issue 2 , March 2017 , pp. 205 - 215
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Copyright
Copyright © Cambridge University Press 2016 

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