摘要
在长期定位施肥的基础上,采用盆栽试验,研究了不同施肥处理对冬小麦根际土壤与非根际土壤中pH、有机质含量及速效养分含量差异的影响。结果表明,(1)CK和PK处理在不同生育期其根际pH值均低于根外,土壤有机质含量逐渐下降。氮肥及和P、K配施的处理中,根际和非根际的pH值均低于PK和CK。N、NP、NPK处理的根际土壤有机质从拔节到成熟期有先下降后上升的趋势,而NK处理根际和非根际土壤有机质含量均逐渐下降。有机肥和化肥配施的处理中,在拔节期根际pH值均小于根外,在抽穗期和成熟期却相反,有机质含量从拔节期到成熟期均高于化肥处理。(2)CK和PK处理,土壤速效氮在各个时期均较其它处理低。长期施用氮肥和其它肥料配施(N、NP、NK、NPK)处理,在拔节期时,根际与非根际土壤的速效氮含量差异不明显,而根际的速效磷含量最高;到成熟期时,以N、NK处理的速效氮含量最高;偏施钾肥(NK和PK)处理的根际与非根际土壤速效钾含量变化不明显,但高于NPK处理;长期施用有机肥和NPK处理根际土速效氮含量较化肥处理高,以MNPK和1.5MNPK处理表现最明显。除SNPK外,各处理根际和非根际土速效磷含量均明显高于化肥处理,以1.5MNPK处理含量最高。
Based on a 15-year long-term fertilization experiment in Chao soil,the effects of different fertilization treatments on pH value,organic matter and available nutrition content in wheat rhizosphere soil and non-rhizosphere soil were studied by pot experiment.The results showed that：（1） The pH values of the CK and PK treatments were much lower in the rhizosphere soil than that in the bulk soil,and soil organic matter content was gradually declining.The pH values in rhizosphere soil and bulk soil of applied nitrogen fertilizer and combined with P,K treatments were less than those of PK and CK treatments.The soil organic matter contents of N,NP and NPK treatments were declining from jointing stage to shooting stage,and then increasing from shooting stage to mature stage,the soil organic matter content of NK treatment was gradually declining.The rhizosphere soil pH values of applied organic fertilizer and chemical fertilizer treatments were lower than that of in the bulk soil at the jointing stage,but it was contrary during the shooting and mature stages;and the organic matter contents of all the treatments were higher than that of applied chemical fertilizers treatment from jointing to mature.（2） The soil available N contents of the CK and PK treatments were lower than those of other treatments at different stages.As for the long-term nitrogen application and those in combination with nitrogen（N,NP,NK,NPK） at the jointing phase,no significant difference of soil available nitrogen content were detected between rhizosphere soil and bulk soil,while the available P content in rhizosphere soil was highest.The soil available N contents of N and NK treatments were highest at the mature stage.The changes of soil available K contents of NK and PK treatment in rhizosphere soil and in bulk soil were no obvious,while they were higher than NPK treatment.The soil available N content in rhizosphere soil amended with long-term organic fertilizer and NPK was higher than chemical fertilizer treatments,which was most obvious in MNPK and 1.5MNPK treatments.In addition to SNPK treatment,the soil available P content of the other treatments was significantly higher than that of chemical fertilizer treatments in rhizosphere soil and bulk soil,and the content of 1.5MNPK treatment was highest.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第3期648-653,共6页
Chinese Journal of Soil Science
基金
国家水体污染控制与治理科技重大专项(2008ZX07010-004)
河南省重大公益性科研招标项目(08000911600)资助
关键词
长期定位施肥
小麦
根际营养
速效养分
Long-termed in-situ fertilization
Wheat
Rhizosphere nutrition
Available nutrition
