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Effects of Biochar Application on Soil Organic Carbon Composition and Enzyme Activity in Paddy Soil under Water-Saving Irrigation

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  • Shihong Yang

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
    College of Agricultural Engineering, Hohai University, Nanjing 210098, China
    Cooperative Innovation Center for Water Safety & Hydro Science, Hohai University, Nanjing 210098, China)

  • Xi Chen

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Zewei Jiang

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Jie Ding

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Xiao Sun

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Junzeng Xu

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
    College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

Abstract

Rice water-saving irrigation technology can remarkably reduce irrigation water input and maintain high yield; however, this technology can also accelerate the decomposition of soil organic matter in paddy fields. The spatial and temporal distributions of soil organic carbon (SOC), water-soluble organic carbon (WSOC), and soil microbial biomass carbon (SMBC) under different water-carbon regulation scenarios were analyzed on the basis of field experiments in the Taihu Lake region in China to explore the effects of biochar application on SOC and its components in water-saving irrigation paddy fields. The response of soil catalase (CAT) and invertase (INV) to biochar application in water-saving irrigated rice fields was clarified. The results showed that water-saving irrigation reduced the SOC content by 5.7% to 13.3% but increased WSOC and SMBC contents by 13.8% to 26.1% and 0.9% to 11.1%, respectively, as compared with flooding irrigation. Nonflooding management promoted the oxidative decomposition of soil organic matter. Two years after straw biochar was added, paddy soil SOC content under water-saving irrigation was increased by 4.0% to 26.7%. The WSOC and SMBC contents were also increased by 4.0% to 52.4% and 7.0% to 40.8%, respectively. The high straw biochar addition rate exhibited great impact on SOC. Remarkable correlations among SOC, WSOC, and SMBC were observed, indicating that the addition of straw biochar improved soil labile C, such as WSOC and SMBC, which promoted SOC transformation and stability in paddy soil under water-saving irrigation. Soil CAT and INV were related to SOC conversion. In conclusion, the combination of water-saving irrigation and straw biochar addition was beneficial to the improvement of soil properties and fertility of paddy fields.

Suggested Citation

  • Shihong Yang & Xi Chen & Zewei Jiang & Jie Ding & Xiao Sun & Junzeng Xu, 2020. "Effects of Biochar Application on Soil Organic Carbon Composition and Enzyme Activity in Paddy Soil under Water-Saving Irrigation," IJERPH, MDPI, vol. 17(1), pages 1-17, January.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:1:p:333-:d:304820
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    References listed on IDEAS

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    1. Yanan Xiao & Shihong Yang & Junzeng Xu & Jie Ding & Xiao Sun & Zewei Jiang, 2018. "Effect of Biochar Amendment on Methane Emissions from Paddy Field under Water-Saving Irrigation," Sustainability, MDPI, vol. 10(5), pages 1-13, April.
    2. Johannes Lehmann & John Gaunt & Marco Rondon, 2006. "Bio-char Sequestration in Terrestrial Ecosystems – A Review," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 11(2), pages 395-419, March.
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    1. Jun Xie & Feng Liang & Junjie Xie & Guanjie Jiang & Xinping Zhang & Qin Zhang, 2022. "Yield Variation Characteristics of Red Paddy Soil under Long-Term Green Manure Cultivation and Its Influencing Factors," IJERPH, MDPI, vol. 19(5), pages 1-10, February.
    2. Yuxin Zhang & Wenqi Ma & Xia Sun & Jingbailun Jiang & Dianpeng Li & Guangmu Tang & Wanli Xu & Hongtao Jia, 2023. "Biochar Aged for Five Years Altered Carbon Fractions and Enzyme Activities of Sandy Soil," Land, MDPI, vol. 12(8), pages 1-11, August.
    3. Xiaodong Wang & Yang Xiao & Xinrui Luo & Chenyu Ye & Yuzhuo Chen & Jincheng Xiang & Ningfei Lei & Ci Song & Xiangjun Pei & Xiaolu Tang, 2023. "Short-Term Effects of Tunnel Construction on Soil Organic Carbon and Enzyme Activity in Shrublands in Eastern Tibet Plateau," Sustainability, MDPI, vol. 15(6), pages 1-12, March.
    4. Sajjad Nasiri & Babak Andalibi & Afshin Tavakoli & Mohammad Amir Delavar & Ali El-Keblawy & Lukas Van Zwieten & Andrea Mastinu, 2023. "The Mineral Biochar Alters the Biochemical and Microbial Properties of the Soil and the Grain Yield of Hordeum vulgare L. under Drought Stress," Land, MDPI, vol. 12(3), pages 1-15, February.

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