Abstract
To investigate the effects of biochar and wood vinegar on the characteristics of saline soil,moderate saline soil in Gansu province was selected as the research object.Soil culture experiment was conducted with six treatments,including soil control(CK),diluted 100 times wood vinegar(WV100),biochar(B),biochar+diluted 100 times wood vinegar(B+WV100),diluted 500 times wood vinegar(WV500),and biochar+diluted 500 times wood vinegar(B+WV500).The results showed that:(1)The addition of wood vinegar treatments,namely WV100 and WV500,increased the available potassium content by 8.24%and 10.73%,respectively,compared to CK,and the addition of biochar in the B,B+WV100 and B+WV500 treatment groups increased the available potassium content by 129.45%,143.82%and 139.36%,respectively,compared to CK.The addition of biochar and wood vinegar,combined with biochar application,increased the soil available phosphorus content by 2.96%-29.49%.The application of wood vinegar and biochar alone or in combination increased the total nitrogen,total potassium and alkaline nitrogen content of the soil,with increases of 10.27%-111.64%,5.0%-40%and 11.53%-61.8%,respectively.The application of biochar significantly increased soil organic matter content,and the three treatments with biochar added increased soil organic matter content by 105.47%-126.45%,compared to CK.The application of wood vinegar(diluted 100 times)alone increased the soil available nutrient contents,while the combination of biochar and wood vinegar significantly increased the soil available nutrient contents.(2)The activities of soil peroxidase,soil polyphenol oxidase,and soil β-glucosidase in the groups treated with wood vinegar increased by 48.57%-58.69%,3.37%-13.99%,and 15.34%-28.95%,respectively,compared to CK.The soil urease activity in the group treated with biochar was higher than that in CK,and the soil acid phosphatase activity in the group treated with biochar increased by 2.18%-4.13%,compared to CK.The application of wood vinegar alone increased the enzyme activities of soil peroxidase,soil polyphenol oxidase,and soil β-glucosidase.Single application of biochar increased the enzyme activity of soil urease and soil acid phosphatase.The combined application of wood vinegar and biochar had a stronger promoting effect on the enzyme activities of urease,peroxidase,and polyphenol oxidase in soil compared to single application.(3)The treatment group treated with single application of wood vinegar showed no significant change in potassium ions compared to CK,while sodium ions increased by 20.11%and 10.90%,respectively.After adding biochar,the soil sodium ion content showed a significant increase,with an increase of 29.66%-48.81%.The application of diluted 100 times wood vinegar alone and biochar alone showed significant changes compared to CK,with increases of 10.93%and 9.67%,respectively.The application of wood vinegar solution(diluted 100 times)alone increased the soil water-soluble salt content,while the combination of biochar and wood vinegar solution increased the soil water-soluble salt content,which was beneficial for the leaching of soluble salt ions and reducing the salt content of saline soil.In summary,the combination of biochar and wood vinegar could improve soil characteristics in moderately saline soil areas.关键词
生物炭/木醋液/中度盐土/土壤特性Key words
biochar/wood vinegar/moderately saline soil/soil characteristics
