Dynamics of pedogenic carbonate in the cropland of the North China Plain: Influences of intensive cropping and salinization

Tongping Lu, Xiujun Wang*, Minggang Xu, Zhitong Yu, Yongming Luo, Pete Smith

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

There is evidence of higher levels of pedogenic carbonate (PIC) than soil organic carbon (SOC) in cropland, and a positive relationship between PIC and SOC in salt-affected soils of arid and semi-arid regions. This study is designed to test the hypothesis that PIC is influenced by intensive cropping and salinization in semi-humid regions, in which soil carbonate (SIC) often exceeds SOC. We select a typical cropland with a maize-wheat rotation in the North China Plain, which covers two distinct regions, i.e. the Hebei Plain (HBP) under intensive cropping and the Yellow River Delta (YRD) under soil salinization. Our data show large variations in soil carbon stocks, with slightly higher values for PIC (3.9–14.5 kg C m−2) relative to those of SOC (2.2–9.2 kg C m−2) in the top 1 m. On average, SOC stock is 5.65 kg C m−2 in the YRD, which is slightly lower than in the HBP (6.21 kg C m−2); SIC is significantly higher in the YRD (16.9 kg C m−2) relative to the HBP (13.7 kg C m−2). However, PIC stock is smaller in the YRD (8.67 kg C m−2) relative to the HBP (9.41 kg C m−2). Despite no clear SIC-SOC relationship, there exists a significant positive correlation (P <  0.01) between PIC and SOC stocks in the study area. The PIC:SOC ratio is generally greater than one over a 0–100 cm layer in the majority of croplands in the north China, with larger ratios in the salt-affected soils. Our analyses suggest that the formation and storage of PIC are regulated by levels of SOC and Ca2+/Mg2+ in soil profiles, and there is large potential for enhancing carbon sequestration as carbonate under intensive cropping through sound management in the cropland of arid, semi-arid and semi-humid regions.
Original languageEnglish
Article number106820
JournalAgriculture Ecosystems & Environment
Volume292
Early online date10 Jan 2020
DOIs
Publication statusE-pub ahead of print - 10 Jan 2020

Fingerprint

intensive cropping
soil salinization
salinization
carbonates
cropping practice
soil organic carbon
carbonate
China
organic carbon
Yellow River
soil
carbon sinks
soil salts
cropland
plain
river
salt
carbon sequestration
arid zones
soil profiles

Keywords

  • pedogenic carbonate
  • soil organic carbon
  • cropland
  • salts
  • North China Plain
  • carbon isotope

Cite this

Dynamics of pedogenic carbonate in the cropland of the North China Plain : Influences of intensive cropping and salinization . / Lu, Tongping; Wang, Xiujun ; Xu, Minggang; Yu, Zhitong; Luo, Yongming; Smith, Pete.

In: Agriculture Ecosystems & Environment, Vol. 292, 106820, 15.04.2020.

Research output: Contribution to journalArticle

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author = "Tongping Lu and Xiujun Wang and Minggang Xu and Zhitong Yu and Yongming Luo and Pete Smith",
note = "This research was supported by the National Natural Science Foundation of China (41877028). The input of Pete Smith contributes to the UK-China Virtual Joint Centre on Nitrogen, N-Circle (BB/N013484/1), funded under the Newton Fund, and the NERC-funded project Soils-R-GRREAT (NE/P019455/1). The authors have no conflict of interest to declare.",
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AU - Xu, Minggang

AU - Yu, Zhitong

AU - Luo, Yongming

AU - Smith, Pete

N1 - This research was supported by the National Natural Science Foundation of China (41877028). The input of Pete Smith contributes to the UK-China Virtual Joint Centre on Nitrogen, N-Circle (BB/N013484/1), funded under the Newton Fund, and the NERC-funded project Soils-R-GRREAT (NE/P019455/1). The authors have no conflict of interest to declare.

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N2 - There is evidence of higher levels of pedogenic carbonate (PIC) than soil organic carbon (SOC) in cropland, and a positive relationship between PIC and SOC in salt-affected soils of arid and semi-arid regions. This study is designed to test the hypothesis that PIC is influenced by intensive cropping and salinization in semi-humid regions, in which soil carbonate (SIC) often exceeds SOC. We select a typical cropland with a maize-wheat rotation in the North China Plain, which covers two distinct regions, i.e. the Hebei Plain (HBP) under intensive cropping and the Yellow River Delta (YRD) under soil salinization. Our data show large variations in soil carbon stocks, with slightly higher values for PIC (3.9–14.5 kg C m−2) relative to those of SOC (2.2–9.2 kg C m−2) in the top 1 m. On average, SOC stock is 5.65 kg C m−2 in the YRD, which is slightly lower than in the HBP (6.21 kg C m−2); SIC is significantly higher in the YRD (16.9 kg C m−2) relative to the HBP (13.7 kg C m−2). However, PIC stock is smaller in the YRD (8.67 kg C m−2) relative to the HBP (9.41 kg C m−2). Despite no clear SIC-SOC relationship, there exists a significant positive correlation (P <  0.01) between PIC and SOC stocks in the study area. The PIC:SOC ratio is generally greater than one over a 0–100 cm layer in the majority of croplands in the north China, with larger ratios in the salt-affected soils. Our analyses suggest that the formation and storage of PIC are regulated by levels of SOC and Ca2+/Mg2+ in soil profiles, and there is large potential for enhancing carbon sequestration as carbonate under intensive cropping through sound management in the cropland of arid, semi-arid and semi-humid regions.

AB - There is evidence of higher levels of pedogenic carbonate (PIC) than soil organic carbon (SOC) in cropland, and a positive relationship between PIC and SOC in salt-affected soils of arid and semi-arid regions. This study is designed to test the hypothesis that PIC is influenced by intensive cropping and salinization in semi-humid regions, in which soil carbonate (SIC) often exceeds SOC. We select a typical cropland with a maize-wheat rotation in the North China Plain, which covers two distinct regions, i.e. the Hebei Plain (HBP) under intensive cropping and the Yellow River Delta (YRD) under soil salinization. Our data show large variations in soil carbon stocks, with slightly higher values for PIC (3.9–14.5 kg C m−2) relative to those of SOC (2.2–9.2 kg C m−2) in the top 1 m. On average, SOC stock is 5.65 kg C m−2 in the YRD, which is slightly lower than in the HBP (6.21 kg C m−2); SIC is significantly higher in the YRD (16.9 kg C m−2) relative to the HBP (13.7 kg C m−2). However, PIC stock is smaller in the YRD (8.67 kg C m−2) relative to the HBP (9.41 kg C m−2). Despite no clear SIC-SOC relationship, there exists a significant positive correlation (P <  0.01) between PIC and SOC stocks in the study area. The PIC:SOC ratio is generally greater than one over a 0–100 cm layer in the majority of croplands in the north China, with larger ratios in the salt-affected soils. Our analyses suggest that the formation and storage of PIC are regulated by levels of SOC and Ca2+/Mg2+ in soil profiles, and there is large potential for enhancing carbon sequestration as carbonate under intensive cropping through sound management in the cropland of arid, semi-arid and semi-humid regions.

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KW - soil organic carbon

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KW - carbon isotope

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