华南农业大学学报2025，Vol.46Issue(2)：141-150,10.DOI:10.7671/j.issn.1001-411X.202401001
生物炭添加对红壤硅磷形态转化、有效性及大豆植株吸收的影响
Effects of biochar addition on transformation,availability and soybean plant uptake of silicon and phosphorus in red soil
摘要
Abstract
[Objective]A large number of studies have confirmed that biochar can improve soil fertility,increase nutrient availability and promote crop growth.Given the low levels of silicon(Si)and phosphorus(P)elements in red soil in southern China,it is imperative to investigate the impacts of biochar addition on chemical speciation and plant uptake of Si and P.[Method]Using Si-rich rice straw and husk biochar as test materials,the impacts of adding different doses(0,1%,2%,4%)of biochar on the transformation and availability of Si and P in red soil,as well as nutrient uptake in soybean plants were studied.[Result]Different types and dosages of biochar significantly reduced exchangeable acid content in soil,while increased soil pH and C/N,effective cation exchange capacity and base saturation.The greater the amount of biochar added,the more significant the increase.Straw biochar was significantly more effective than husk biochar.Compared with control,the contents of soil available Si and labile P fraction NaHCO3-Po in biochar treatments increased by 4.1%-85.0%and 175.2%-2139.6%,respectively.Biochar application significantly increased dry matter accumulation in soybean plant,improved root morphological characteristics,increased Si concentration of soybean roots and leaves,promoted the uptake and transport of Si and P by roots,and the effect of straw biochar was more significant.[Conclusion]The application of rice straw and husk biochar significantly affects the form and transformation of P and Si in acid soil,increases their availability,absorption and utilization by plants.Straw biochar shows better effect.关键词
生物炭/红壤/有效态硅/活性磷/养分吸收Key words
Biochar/Red soil/Available silicon/Labile phosphorus/Nutrient absorption分类
农业科学引用本文复制引用
罗家欣,邓金环,田纪辉,蔡昆争..生物炭添加对红壤硅磷形态转化、有效性及大豆植株吸收的影响[J].华南农业大学学报,2025,46(2):141-150,10.基金项目
国家自然科学基金(41807084) （41807084）
