植物营养与肥料学报2010,16(3)：634-641 Plant Nutrition and Fertilizer Science
湖南稻田土壤有机磷组分的施磷效应、
季节变化及生物有效性研究
冯跃华1,2，张杨珠2*，黄运湘2
（1贵州大学农学院，贵州贵阳550025；2湖南农业大学资源环境学院，湖南长沙410128）
摘要：为探明施用磷肥对潮南稍田土壤有机磷组分的影响、有机磷组分的季节变化及其有效性，以潮南省5种不同母质发育的稍田土壤为供试土壤，通过盘栽试验，研究了稍田土壤有机磷组分的施磷效应、在植霜期间的动态变化及其生物有效性。结果表明，施用磷肥可以使土壤中活性有机磷得到较大的增加，前对活性有机磷、中稳性有机磷和高稳性有机磷影响较小。在施磷和不施磷条件下，土壤有机磷的变化主要是中活性有机磷，而其余3种形态有机磷在水霜生长期闻几乎保持不变。不管土境是否施用磷肥，土填有效磷与有机磷总量总是呈极显著相关，说明土境有机磷的确是植物可以利用的有效辞源：在早稽生长期间土填各形态有机磷的生物有效性的大小顺序为：中活性有机磷>中稳性有机磷>高稳性有机磷>活性有机磷；在晚稻生长期间土壤各形态有机磷的生物有效性一般随水稍生育期不同而不同。
关键调：水稽土：有机磷组分；磷肥；季节变化：生物有效性
中图分类号：S153.6
文献标识码：A
文章编号：1008505X(2010)030634-08
Effectsofphosphatezationonorganicphosphorusfractionsandtheirseasonal
variationsandbioavailabilitiesofpaddysoilsinHunanProvince
FENG Yue-hua'-2, ZHANG Yang-zhu?, HUANG Yun-xiang
(I College of Agronomy，Guizhou Uninersity，Guiyang 550025，China
2 College of Resowrce and Enrironment Sciences,Hunan Agricultuwral Unitersity, Changsha 410128,China）
Abstract: Effects of phosphate fertilizer applications on soil organic phosphorus fractions and their seasonal variations and bioavailability were studied using the pot experiments, Five paddy soils derived from different parent materials in Hunan Province were used as test soils for the pot experiment, The results show that soil moderately labile organic phosphorus contents are increased under the P fertilizer application, while the fertilization has less effects soil labile organic phospho-rus, moderately resistant organic phosphorus and highly resistant organic phosphorus. Soil organic P variation is mainly caused by the variation of moderately labile organic P under both P - unfertilization and P fertilization, while the labile organic phosphorus and resistant organic phosphorus are not changed during rice growth and development stages. Avail-able P was closely correlated with organic P in both P unfertilized and P fertilized soils, that is to say, the importance of organic P as a source of available P in soil were demonstrated. The bioavailability of soil organic P fractions during the growth periods of early rice in the pot experiment are in order of moderately labile organic P > moderately resistant or-ganic P > highly resistant organic P > labile organic P, while the order for late rice is dependent on the growth and de velopment stages of late rice
Key words: paddy soil; organic phosphorus fractions; phosphate fertilizer; seasonal variation; bioavailability
收稿日期：2009-0517
接受日期：2009-08-11
基金项目：贵州省科学技术基金项H[黔科合」字(2007)2069]；贵州大学人才引进科研基金项目资助。
作者介：冯跃华（1969—），男，期北省仙桃市人，博士，副教授，主要从事水稻裁塔生理生态及土境科学研究。E-mail：fengyuehua2006@126.com
通讯作者E-mil：zhangyangzhu2006@163.com
万方数据