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Functional soil organic matter fractions in response to long-term fertilizer management in a double-cropping paddy field of southern China

Published online by Cambridge University Press:  12 March 2021

Haiming Tang Open the ORCID record for Haiming Tang [Opens in a new window] ,
Chao Li ,
Lihong Shi ,
Li Wen ,
Kaikai Cheng ,
Weiyan Li  and
Xiaoping Xiao
Haiming Tang*
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Chao Li
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Lihong Shi
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Li Wen
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Kaikai Cheng
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Weiyan Li
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
Xiaoping Xiao
Affiliation:
Hunan Soil and Fertilizer Institute, Changsha410125, PR China
*
Author for correspondence: Haiming Tang, E-mail: [email protected]
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Abstract

Soil organic matter (SOM) and its fractions play an important role in maintaining or improving soil quality and soil fertility. Therefore, the effects of a 34-year long-term fertilizer regime on six functional SOM fractions under a double-cropping rice paddy field of southern China were studied in the current paper. The field experiment included four different fertilizer treatments: chemical fertilizer alone (MF), rice straw residue and chemical fertilizer (RF), 30% organic manure and 70% chemical fertilizer (OM) and without fertilizer input as control (CK). The results showed that coarse unprotected particulate organic matter (cPOM), biochemically, physically–biochemically and chemically protected silt-sized fractions (NH-dSilt, NH-μSilt and H-dSilt) were the main carbon (C) storage fractions under long-term fertilization conditions, accounting for 16.7–26.5, 31.1–35.6, 16.2–17.3 and 7.5–8.2% of the total soil organic carbon (SOC) content in paddy soil, respectively. Compared with control, OM treatment increased the SOC content in the cPOM, fine unprotected POM fraction, pure physically protected fraction and physico-chemically protected fractions by 58.9, 106.7, 117.6 and 28.3%, respectively. The largest proportion of SOC to total SOC in the different fractions was biochemically protected, followed by chemically and unprotected, and physically protected were the smallest. These results suggested that a physical protection mechanism plays an important role in stabilizing C of paddy soil. In summary, the results showed that higher functional SOM fractions and physical protection mechanism play an important role in SOM cycling in terms of C sequestration under the double-cropping rice paddy field.

Keywords

Carbon sequestrationfertilizer managementphysical and chemical fractionationricesoil organic carbon
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 158 , Issue 8-9 , November 2020 , pp. 730 - 738
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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