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Organic amendment increases soil respiration in a greenhouse vegetable production system through decreasing soil organic carbon recalcitrance and increasing carbon-degrading microbial activity

  • Soils, Sec 3 • Remediation and Management of Contaminated or Degraded Lands • Research Article
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Abstract

Purpose

Recent works have shown that fertilization has an important influence on soil respiration (Rs); however, the underlying mechanisms involved in regulating Rs in greenhouse vegetable production (GVP) systems remain unclear.

Materials and methods

Samples from six kinds of soils that were amended with different fertilization patterns (8 years) were incubated for 36 days to determine soil microbial community (PLFA), enzyme activities, soil organic C (SOC) quality (13C NMR), and Rs in a GVP system in Tianjin, China. Treatments included 100% chemical N (CN) and different substitution rates of CN with manure-N and/or straw-N.

Results and discussion

Compared with 100%CN treatment, organic amendment strongly promoted microbial (e.g., fungi, bacteria, and actinomycetes) growth, enhanced the majority of C-degrading enzyme activities, affected SOC chemical composition with increasing O-alkyl (labile) C and reducing aromatic (stable) C, decreased SOC recalcitrance, and enhanced Rs. Redundancy analysis indicated that variations in microbial community and SOC chemical composition were closely linked to light fraction organic C (LFC) and readily oxidizable C (ROC), respectively. Further, structural equation modeling and linear regression analysis revealed that SOC recalcitrance (negative effects) and C-degrading enzyme activities (positive effects) together mediate Rs rates; meanwhile, microbial community can indirect affect Rs rates through altering C-degrading enzyme activities.

Conclusions

Agricultural soil abiotic properties (mainly labile C fractions, i.e., LFC and ROC) are altered by adding organic resources (i.e., manure and straw), the changes of which can promote soil microbial growth, enhance C-degrading microbial activity, and reduce SOC recalcitrance, and in turn accelerate Rs in GVP systems.

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Funding

The authors received financial support provided by the National Key Research and Development Program of China (2016YFD0201001), China Agriculture Research System (CARS-23-B02), and the Key Research and Development Program of Shandong Province, China (2017CXGC0206).

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Authors and Affiliations

  1. Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China

    Haoan Luan, Shaowen Huang, Jiwei Tang & Huaizhi Zhang

  2. Center for Resources, Environment and Food Security, China Agricultural University, Beijing, 100193, China

    Haoan Luan & Xinping Chen

  3. Tianjin Institute of Agricultural Resources and Environment, Tianjin, 300192, China

    Wei Gao & Mingyue Li

  4. Laboratory of Geo-information Science and Remote Sensing, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, The Netherlands

    Dainius Masiliūnas

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  1. Haoan Luan
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  2. Wei Gao
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  4. Jiwei Tang
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Correspondence to Shaowen Huang.

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Luan, H., Gao, W., Huang, S. et al. Organic amendment increases soil respiration in a greenhouse vegetable production system through decreasing soil organic carbon recalcitrance and increasing carbon-degrading microbial activity. J Soils Sediments 20, 2877–2892 (2020). https://doi.org/10.1007/s11368-020-02625-z

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