摘要
[目的]该研究旨在探讨好气培养条件下,不同磷肥施用量的红壤中,应用Olsen法和Bray-1法测定的土壤有效磷含量及应用CaCl2法测定的土壤易流失磷含量的变化及其相关关系,为红壤区的磷素管理及磷素流失潜力评价提供理论依据。[方法]试验共设6个土样处理,室内好气培养后测定各土样中Olsen-P、Bray-1-P和CaCl2-P含量。[结果]随培养时间的延长,施用不同量磷肥的红壤中Olsen-P含量逐渐降低,Bray-1-P含量逐渐升高,CaCl2-P含量呈先升高后降低的趋势;CaCl2-P含量与Olsen-P含量和Bray-1-P含量均呈线性相关关系;肥料磷进入红壤Bray-1-P库的比例高达62%,进入Olsen-P库的比例为14%,进入CaCl2-P库的比例为0.12%。[结论]好气条件下施用磷肥造成红壤磷流失的风险不大,但随施磷量的增加,磷流失潜能仍会升高,且在施磷初期流失潜能最高。
This study was to study the influence of phosphorus（P） fertilizer application on available P and easy-loss P content in red soil under aerobic incubating condition,with the aim to provide theoretical basis for the management of elemental P and evaluation of elemental P loss potential.[Method] Totally six treatments were set to the soil samples.The Olsen-P,Bray-1-P and CaCl2-P contents of each soil sample were measured after indoor aerobic incubation.[Result] In the red soil of different P fertilizer application rates,the Olsen-P content decreased with the increasing of incubation time,while the content of Bray-1-P increased and CaCl2-P content was first increased then decreased.CaCl2-P content was linear correlated with Olsen-P content and Bray-1-P content.About 62% P fertilizers were transformed into Bray-1-P pool,and 14% into Olsen-P pool,but only 0.12% transformed into CaCl2-P pool.[Conclusion] There is little risk of P loss caused by P fertilizer application under aerobic condition,but P loss potential would increase with the increasing application dose,which was most serious in the primeval period after P fertilizer application.
出处
《安徽农业科学》
CAS
2012年第6期3335-3338,共4页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(41101285)
琼州学院青年教师科研基金项目(QYQN201124)
关键词
磷肥
有效磷
红壤
培养
Phosphorus fertilizer
Available phosphorus
Red soil
Incubation
