Liu Pei, Chen Lihua, Hamoud Yousef Alhaj, Zheng Jinhai, Chang Tingting, Ali Jawad, Huang He, Shaghaleh Hiba
College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China.
College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China.
Heliyon. 2024 Aug 23;10(17):e36762. doi: 10.1016/j.heliyon.2024.e36762. eCollection 2024 Sep 15.
To investigate the effect of polyγglutamic acid (γ-PGA) biopreparation on ameliorating coastal saline soil, three treatments were established: soil salt washed treatment (CK), soil salt washed with added γPGA (PGA), soil salt washed with added γPGA biopreparation (PGAB). This study determined the effects of γ-PGA on coastal saline soil by analyzing soil aggregate, soil evaporation, soil vertical water and salt distribution, and soil cation content, soil pH, soil nutrient content and soil microorganism quantity. Results showed that γ-PGA had an ameliorative effect on saline soil, with the PGAB treatment exhibiting the most pronounced ameliorative effect compared to CK. Adding PGAB reduced soil evaporation by 30.45 %, soil salt content by 27.91 %, meanwhile increasing plant height by 33.86 %, plant fresh weight by 98.54 %, soil aggregate diameter by 6.68 times, soil water content by 26.47 % ( < 0.05). Additionally, soil total nitrogen was increased by 50.0 % in PGAB treatment, and available nitrogen and phosphorus contents were increased by 1.68 times and 85.83 % ( < 0.05), respectively. Populations of soil-culturable bacteria and fungi of PGAB treatment increased by 65.96 % and 1.23 times, respectively ( < 0.05). After salt-washing process, adding PGAB improved soil physicochemical properties, which altered the ecological environment of rhizosphere soil and promoted plant growth. The results can provide a practical approach for ameliorating coastal saline soils.
为研究聚γ-谷氨酸（γ-PGA）生物制剂对滨海盐渍土的改良效果，设置了3种处理：土壤洗盐处理（CK）、添加γ-PGA洗盐处理（PGA）、添加γ-PGA生物制剂洗盐处理（PGAB）。本研究通过分析土壤团聚体、土壤蒸发、土壤垂直水盐分布、土壤阳离子含量、土壤pH值、土壤养分含量和土壤微生物数量，确定了γ-PGA对滨海盐渍土的影响。结果表明，γ-PGA对盐渍土有改良作用，与CK相比，PGAB处理的改良效果最为显著。添加PGAB使土壤蒸发量降低了30.45%，土壤盐分含量降低了27.91%，同时使株高增加了33.86%，植株鲜重增加了98.54%，土壤团聚体直径增加了6.68倍，土壤含水量增加了26.47%（P<0.05）。此外，PGAB处理的土壤全氮增加了50.0%，有效氮和有效磷含量分别增加了1.68倍和85.83%（P<0.05）。PGAB处理的土壤可培养细菌和真菌数量分别增加了65.96%和1.23倍（P<0.05）。洗盐后添加PGAB改善了土壤理化性质，改变了根际土壤生态环境，促进了植物生长。研究结果可为滨海盐渍土改良提供实用方法。
