不同石灰性土壤磷素形态及其有效性差异  

Difference of Phosphorus Fractions and Availability of Different Calcareous Soils

作　　者：卜玉山[1] 梁美英[1] 张广峰[1,2] 郭淑红[1,3] 史晓凯[1] 马茹茹[1] 

机构地区：[1]山西农业大学资源环境学院,山西太谷030801 [2]山西省农业科学院玉米研究所,山西忻州034000 [3]山西省农业科学院经济作物研究所,山西汾阳032200

出　　处：《山西农业大学学报（自然科学版）》2011年第3期193-199,共7页Journal of Shanxi Agricultural University(Natural Science Edition)

基　　金：国家"十一五"科技支撑计划课题(2007BAD88B03)

摘　　要：研究了山西中部和中西部盆地与丘陵区26个石灰性土壤的磷素总量及其形态差异,并利用通径分析分析了不同磷素形态与速效磷的关系,以了解供试土壤利用状况对土壤磷素总量、形态分布及其有效性的影响。结果表明:供试土壤无机、有机磷总量均差异明显,无机磷以Ca-P为主,有机磷以MLOP为主。大棚石灰性褐土无机磷中Ca2-P、Ca8-P和Al-P显著高于其它供试土壤,且Ca8-P含量超过Ca10-P,有机磷中MLOP显著高于其它供试土壤,且LOP和MROP含量也较高。无机形态磷与速效磷均显著正相关,除HROP外,其余有机形态磷与速效磷均为显著正相关。通径分析进一步表明,Ca2-P对速效磷的直接影响达显著水平,其余无机形态磷的间接影响均达显著水平;MLOP和LOP对速效磷的直接影响均达显著水平,LOP和MROP的间接影响都达显著水平,HROP既无直接影响,也无间接影响。利用管理强度特别是施肥不同是导致供试石灰性土壤有机和无机磷总量及其不同形态分布差异的主要原因。通径分析不同形态磷素对土壤速效磷的影响更为简单明确。The differences of total P and P fractions of 26 farmland calcareous soils sampled from the basin and hilly regions in middle and midwest parts of Shanxi province and the relations of different P fractions with available P were studied with path analysis to understand the effect of utilization on total quantity,fraction distribution,and availability of P in experimental soils.The results showed that the contents of inorganic and organic P were significantly different between the 26 soils.Ca-P was the chief part in inorganic P and MLOP was the chief part in organic P.The contents of Ca8-P were higher than that of Ca10-P in the greenhouse calcic cinnamon soils,and the contents of Ca2-P,Ca8-P,and Al-P were all much higher than that in the other experimental soils.The contents of MLOP in the greenhouse calcic cinnamon soils were significantly higher than that in the other experimental soils and the contents of LOP and MROP were all relatively higher too.All of the inorganic P factions were significantly positively related to available P,and all organic P fractions but HROP were significantly positively related to available P too.Path analysis further indicated that the direct effect of Ca2-P on available P was significant and the indirect effects of the five other inorganic P fractions on available P through Ca2-P were significant.The direct effects of LOP and MLOP on available P were both significant and both LOP and MROP had significant indirect effects on available P through MLOP,but HROP had neither direct nor indirect effect on available P.Utilization intensity especially fertilization is the major factor that leads to the differences of total quantity and fraction distribution of P in experimental soils.Path analysis is a simple and explicit method for analyzing the effect of different P fractions on soil available P.

关 键 词：石灰性土壤 有机形态磷 无机形态磷 速效磷 相关性 通径分析 

分 类 号：S153[农业科学—土壤学]