Acta Agriculturae Zhejiangensis ›› 2026, Vol. 38 ›› Issue (2): 327-338.DOI: 10.3969/j.issn.1004-1524.20250118

• Environmental Science • Previous Articles     Next Articles

Effect and mechanisms of remediation on salinized greenhouse soil by earthworm-straw

LIU Jiaming1,2(), WANG Nan3, MA Zhimei2, LYU Weiguang2,4,5, ZHENG Xianqing2,6,7, SONG Ke2,5,7, ZHANG Hanlin2,4,5, ZHANG Haiyun2,4,5, ZHANG Yue2,4,5,*(), ZHANG Juanqin2,4,5   

  1. 1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
    2. Institute of Ecological and Environmental Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
    3. Shanghai Shangrealizai Agricultural Development Co., Ltd., Shanghai 202183, China
    4. Shanghai Key Laboratory of Facility Horticulture Technology, Shanghai 201403, China
    5. Shanghai Agricultural Environmental Protection Monitoring Station, Shanghai 201403, China
    6. Shanghai Agricultural Environment and Cultivated Land Conservation Scientific Observation and Experiment Station, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
    7. Shanghai Low Carbon Agricultural Engineering Technology Research Center, Shanghai 201403, China
  • Received:2025-02-17 Online:2026-02-25 Published:2026-03-24

Abstract:

Aimed at the production obstacles associated with salinized greenhouse soil, an experiment was conducted on soils with 10 years of continuous cropping of grape (electrical conductivity of 2 301.55 μS·cm-1) to evaluate the remediation effect of the combined application of earthworms and straw on salinized greenhouse soil and identify the key functional microorganisms involved. Earthworms and rice straw were introduced for soil remediation, with six treatments established: no earthworms or straw addition (CK), 1% rice straw addition (S1), 2% rice straw addition (S2), 0.6 kg·m-2 Pheretima guillelmi addition (E), 0.6 kg·m-2 P. guillelmi combined with 1% rice straw (S1E), and 0.6 kg·m-2 P. guillelmi combined with 2% rice straw (S2E). On the 90th day (the end of the experiment), the electrical conductivity of the topsoil (0-20 cm) in treatments S1, S2, S1E, and S2E decreased by 46.43%, 49.74%, 52.34%, and 53.44%, respectively, compared with that on the 15th day. Compared with CK, the contents of alkali-hydrolyzable nitrogen, available phosphorus, available potassium, organic matter, and dissolved organic carbon in S1E and S2E were significantly (p<0.05) increased by 12.68%-14.16%, 12.45%-14.58%, 14.89%-17.10%, 19.48%-21.24%, and 30.19%-31.03%, respectively. Besides, three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy analysis revealed an increase in the content of humic substances in the soil. Among the treatments with straw addition (S1, S2, S1E, S2E), the absolute abundances of straw-degradation-related genera (e.g., Sphingomonas, Devosia, Altererythrobacter, Chthoniobacter, norank_f_Microscillaceae) and salt-sensitive genera (e.g., Pseudoxanthomonas, Luteolibacter, Arthrobacter, norank_f_norank_o_Gaiellales) were all higher than those in CK. Overall, the combined remediation with earthworms and straw reduced soil salinity, improved soil fertility, and alleviated the salt stress on soil microbial communities in salinized greenhouse soil, which was attributed to promoting the downward migration of salt ions in the topsoil, enhancing straw degradation, and regulating the soil microbial community structure.

Key words: salinized soil, straw, earthworm, soil nutrient, soil microorganism

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