摘要
在红壤旱地肥料长期定位试验(始于1988年)中,选取了无机肥试验区的NPK、NP、NK、PK,有机无机配施试验区的CK、CK+猪厩肥(BM)及CK+花生秸秆(SR)等7个施肥处理土壤,测定了土壤磷吸持指数(Phosphate sorption index,PSI),分析了PSI与红壤最大吸磷量(Xm)的相关关系,讨论了土壤pH、有机质、黏粒、铁铝氧化物及无机磷酸盐等基质组分对PSI的影响。结果表明:长期施磷或配施有机肥均可显著降低红壤PSI值,随着土壤pH的升高、有机质及铁结合态磷酸盐(Fe-P)含量的增加,红壤PSI显著降低;土壤游离铁铝氧化物及黏粒含量越高,PSI也越大。PSI与Xm呈显著线性相关关系(Xm=0.5PSI+412.8,n=15,r=0.967**,p<0.01),因此,可以用PSI替代Xm来表征土壤固磷能力,亦可由PSI的大小来推断土壤磷的供磷能力。
Soil samples were collected form the 7 treatments（NPK,NP,NK,PK,CK,CK ＋ BM,and CK ＋ SR） of a long-term upland fertilization field experiment,which started in 1988,for determination of phosphate sorption index（PSI） with soil maximum P sorption capacity（Xm）,and hence discussions on effects of the soil matrix component,like soil pH,organic matter（OM）,clay,iron-aluminum oxides and inorganic phosphates on PSI.Results show that long-term application of phosphorus fertilizer or combined application of organic and chemical fertilizer could significantly reduce PSI.With rising soil pH and organic matter and iron phosphate（Fe-P） content,PSI decreased markedly.But the higher the contents of free iron-aluminum oxides and clay in the red soil,the higher the soil PSI.Soil phosphate sorption index（PSI） showed a significant linear correlation with soil maximum P sorption capacity（Xm）,（Xm=0.5PSI ＋ 412.8,r=0.967＊ ＊,p0.01）.Therefore,the former could used to replace soil maximum P sorption capacity（Xm） to characterize soil phosphorus sorption capacity and soil phosphorus supply capacity as well.
出处
《土壤学报》
CAS
CSCD
北大核心
2012年第3期552-559,共8页
Acta Pedologica Sinica
基金
国家自然科学基金项目(No.40901146)
江苏省高校自然科学研究项目(No.10KJB210003)
江苏省高校"青蓝工程"资助
江苏高校优势学科建设工程项目资助
关键词
红壤
磷吸持指数
有机质
PH
铁铝氧化物
磷酸盐组成
Red soil
Phosphate sorption index（PSI）
Organic matter
pH
Iron-Aluminum oxides
Inorganic phosphate
