生态环境学报2025，Vol.34Issue(5)：710-719,10.DOI:10.16258/j.cnki.1674-5906.2025.05.005
生物炭与磷添加促进赤红壤的硅形态转化和大豆植株硅吸收转运
Biochar Combined with Phosphorus Promote Silicon Fraction Transformation and Si Absorption of Soybean Plant in Latosolic Red Soil
摘要
Abstract
Biochar,which is rich in carbon(C)and silicon(Si),is an ideal soil conditioner,particularly in acidic soils.There is an interaction between silicon and phosphorus in the soil,both of which play important roles in crop growth.However,further studies are needed to explore the mechanisms of biochar and phosphorous application on the transformation of soil Si forms and the absorption and transport of Si in plants.Four treatments were established through pot experiment,including control,phosphorus,biochar,phosphorus,and biochar,to investigate the effects of rice straw biochar and phosphorus application on soil acidification mitigation in lateritic red soil,focusing on soil Si fractions and transformation,Si absorption,and transfer of soybean plants.The results showed that biochar application significantly reduced soil exchangeable acid,increased soil pH(1.43‒2.16 unit)and exchangeable base ions K+,Ca2+,and Mg2+,and increased the content of available phosphorus,total carbon,and total nitrogen in the soil,whereas single P or P combined with biochar treatment did not influence these indices.Regardless of phosphorus addition,biochar supply significantly increased organic bonded Si,iron and manganese oxide Si,amorphous Si,and available Si in the soil,while reducing the proportion of amorphous Si,facilitating fraction transformation of soil Si into available Si,and soil available Si was increased by 7.78‒11.6 times.Biochar treatment significantly increased Si concentrations in soybean plants by 58.8%,50.4%,and 149%in stems,leaves,and grains,respectively,but significantly downregulated the expression of the Si transporter gene GmNIP2-2 in roots,whereas P alone or in combination with biochar did not influence these indicators.Biochar application significantly increased soybean height(8.95%‒23.0%)but reduced plant biomass and production.In conclusion,rice straw biochar addition plays an important role in alleviating soil acidification,promoting Si chemical fraction transformation in soil,and increasing soil Si availability and plant Si absorption,indicating its great potential to improve acidic soil.However,the yield effect on soybeans is still unstable,and phosphorus application does not demonstrate mitigation effects in acidic soil.关键词
酸性土壤/生物炭/磷/大豆/硅的有效性/硅形态Key words
acid soil/biochar/phosphorous/soybean/silicon availability/silicon fraction分类
农业科学引用本文复制引用
林泳怡,周燕飞,邓金环,田纪辉,蔡昆争..生物炭与磷添加促进赤红壤的硅形态转化和大豆植株硅吸收转运[J].生态环境学报,2025,34(5):710-719,10.基金项目
国家自然科学基金项目(41807084) （41807084）
广东省自然科学基金项目(2018A030310214) （2018A030310214）
