棉花秸秆生物炭对风沙土中磷溶出的影响  

Effect of Cotton Straw Biochar on Phosphorus Dissolution in Sandy Soil

作　　者：唐玉琴 王耀锋 起冰莹 唐琦 刘贺 TANG Yuqin;WANG Yaofeng;QI Bingying;TANG Qi;LIU He(College of Resources and Environment,Xinjiang Agricultural University/China Xinjiang Key Laboratory of Soil and Plant Ecological Process,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆农业大学资源与环境学院/新疆土壤与植物生态过程重点实验室,新疆乌鲁木齐830052

出　　处：《天津农业科学》2023年第12期57-61,68,共6页Tianjin Agricultural Sciences

基　　金：自治区自然科学基金(2022D01B93)。

摘　　要：为探究不同温度生物炭对风沙土中磷溶出的影响,分别制备了不同炭化温度(300、500、700℃)的棉花秸秆生物炭,关注了它们中不同磷组分含量(0.25 mol·L^(-1)硫酸提取的H2SO4-P,0.1 mol·L^(-1)氢氧化钠提取的NaOH-P,0.5 mol·L^(-1)碳酸氢钠提取的NaHCO3-P和蒸馏水提取的H2O-P),开展了生物炭磷的动力学溶出和对风沙土中磷连续溶出影响的系列试验。结果表明:H2SO4-P含量最多,且700℃生物炭中磷含量最高(3.27 mg·g-1)。炭化温度越高,生物炭中磷的动力学溶出越高,30 d溶出量最大,700℃生物炭溶出磷的能力最强,溶出浓度为3.968 mg·g-1。700℃棉花秸秆生物炭60 d累积磷溶出量最高,而生物炭添加到风沙土中后,300℃的棉花秸秆生物炭对风沙土磷溶出提升效果最好,超出单独土壤磷溶出0.111 mg,这可能与生物炭对磷酸根吸附有关,700℃生物炭的吸附效果最好,最高可达1.818 mg·g-1。风沙土中施加棉花秸秆生物炭能提高风沙土中磷的溶出量,且生物炭能持续为土壤提供磷养分,为生物炭利用改善风沙土磷养分提供参考。In order to explore the effect of biochar at different temperatures on the dissolution of phosphorus in aeolian sandy soil,cotton straw biochars with different carbonization temperatures(300,500,700°C)were prepared,and their different phosphorus fractions(0.25 mol·L^(-1) sulfuric acid extracted H2SO4-P,0.1 mol·L^(-1) sodium hydroxide extracted NaOH-P,0.5 mol·L^(-1) sodium bicarbonate extracted NaHCO3-P and distilled water extracted H2O-P)were concerned.A series of experiments on the kinetic dissolution of biochar phosphorus and its effect on the continuous dissolution of phosphorus in aeolian sandy soil were carried out.The results showed that the content of H2SO4-P was the highest,and the content of phosphorus in biochar at 700°C was the highest,reaching 3.27 mg·g-1.The higher the carbonization temperature was,the higher the kinetic dissolution of phosphorus in biochar was,and the maximum dissolution amount was 30 days.The ability of biochar to dissolve phosphorus at 700°C was the strongest,and the dissolution concentration was 3.968 mg·g-1.The cumulative phosphorus dissolution of cotton straw biochar at 700°C for 60 days was the highest.After the biochar was added to the sandy soil,the cotton straw biochar at 300°C had the best effect on the phosphorus dissolution of the sandy soil,which was 0.111 mg higher than that of the single soil,which may be related to the adsorption of phosphate by biochar.The adsorption effect of biochar at 700°C was the best,up to 1.818 mg·g-1.The application of cotton straw biochar in aeolian sandy soil can increase the dissolution of phosphorus in aeolian sandy soil,and biochar can continuously provide phosphorus nutrients for soil,which provides a reference for biochar utilization to improve phosphorus nutrients in aeolian sandy soil.

关 键 词：生物炭 磷组分 磷溶出 

分 类 号：S156[农业科学—土壤学]