摘要
采用蒋柏藩、顾益初的土壤无机磷分级体系,对桂林毛村岩溶区旱耕地、灌丛、林地、水田土壤的无机磷形态分布特征进行研究。结果表明,岩溶区土壤全磷含量较高,速效磷和无机磷的含量均较低。4种土地利用类型总无机磷含量在49.87～489.80g/kg之间,占全磷的比例在6.08%～56.64%之间。各无机磷形态分布除Fe-P以外,均以水田最高,总无机磷含量水田也为最大。在同一土壤剖面不同发生层次上,Ca2-P、Ca8-P、Al-P、Fe-P、Ca10-P的含量随着深度的增加而减小,O-P含量随着深度增加而升高,对比各无机磷形态含量大小发现:Ca10-P>O-P>Fe-P>Al-P>Ca8-P>Ca2-P。对各无机磷形态与速效磷相关性分析表明:Ca2-P、Ca8-P、Al-P、O-P与速效磷呈极显著正相关关系;各无机磷形态之间,除Ca2-P与Ca10-P相关性不显著,Ca8-P、Al-P、Fe-P与O-P、Ca10-P相关性不显著,其余各形态无机磷之间均存在极显著的相关性。4种土地利用类型土壤磷素活化系数(PAC)除了水田耕层为2.5%>2.0%外,其余土地利用类型的PAC均小于2.0%,说明岩溶区全磷不易转化为速效磷,有效性较低。
This paper selects cultivated land,shrub,forest and paddy fields in karst area as the research objects to study the content of available phosphorus and distribution of inorganic phosphorus.The results showed that the contents of total P were higher,but available P and inorganic P were lower.The content of total inorganic phosphorus in the above four kinds of land use types was between 49.87 g/kg and 489.80g/kg and accounted for between 6.08% and 56.64%.Almost all the contents of inorganic phosphorus fraction in paddy field and its total inorganic phosphorus were the highest among all the land use types but except Fe-P.With the increase of soil depth the contents of Ca2-P,Ca8-P,Al-P,Fe-P and Ca10-P reduced.And the content of O-P increased with the increase of soil depth.Comparison of all the contents of inorganic phosphorus fraction was Ca10-P〉O-P〉Fe-P〉Al-PCa8-P〉Ca2-P.The relations between all the contents of inorganic phosphorus fraction and available P showed that there were significant positive correlations between Ca2-P,Ca8-P,Al-P and O-P and available P.Although there was no significant correlation between Ca2-P and Ca10-P,and there was no significant correlation between Ca8-P,Al-P,Fe-P and O-P,Ca10-P either.Among the other inorganic phosphorus fraction were more significant.Except for cultivating layer of paddy which its PAC was above 2.0,others were all less than 2.0.This showed that the total phosphorus in karst areas not easily converted to available phosphorus and had lower effectiveness.
出处
《水土保持学报》
CSCD
北大核心
2010年第2期135-140,共6页
Journal of Soil and Water Conservation
基金
岩溶动力学重点实验室开放课题(kdl2008-10)
广西壮族自治区创新能力项目(0842008)
国家自然科学基金项目(40872213)
中国地质调查局工作项目(1212010911062)
