摘要
以Langmuir曲线测出的Xm值(最大吸磷量)为指标,对不同施肥条件下红壤旱地土壤的吸磷能力变化特征及影响磷素吸附的主要因素进行了研究。结果表明:施用磷肥能显著降低土壤的最大吸磷量,其中,施用厩肥的土壤Xm值最小。有机质是影响土壤吸磷能力的一个重要因素,随着有机质含量的升高,土壤吸磷能力减小;活性铝也是影响磷素吸附的重要因素,随活性铝含量增加,磷素吸附能力增加;活性铁的影响不显著;pH对红壤旱地吸磷能力影响也不显著。通过因子分析得到,有机质含量对土壤吸附磷素的能力影响最大。在生产上,磷素最大吸附量Xm值可以作为初步判断土壤需施磷肥量大小的依据。这些可为红壤地区的磷素施用研究提供理论依据和实践指导。
Characteristics of phosphorus adsorption by upland red soils different in fertilization and their affecting factors were studied with Xm-value calculated out of the Langmuir curve as index. The results show： （1） Xm-value is always lower in soil fertilized with inorganic or organic phosphorus than in soil not fertilized with phosphorus. Livestock manure is an effective fertilizer because it makes Xm-value lower than other fertilizers. （2） Organic matter and available-Al significantly influence soil P absorbing capacity, which rises with the increase in available-Al content in soil, but it declines with the increase in organic matter content, pH and available-Fe are minor factors affecting Xm-value in this research. The above-llsted results arc testified by data reduction-analysis, indicating the content of organic matter was the most influential factor found. （3） Because of the good relationship between Xm-value and/f-value, which can be used as a basis for recommendation of P fertilization in practice, Xm-value may be an index to judge the amount of P fertilizer needed in the field primarily. In a word, these results contribute to research on transformation of phosphorus and determination of P application rate in red soil regions.
出处
《土壤学报》
CAS
CSCD
北大核心
2006年第2期267-272,共6页
Acta Pedologica Sinica
基金
中国科学院知识创新项目(KZCX2-413)
国家"973"项目(2005CB121107)资助
关键词
红壤旱地
不同施肥条件
磷素吸附
影响因素
Upland red soil
Different fertilization
Phosphorus adsorption
Affecting factor
