华南地区蔬菜地不同质地土壤磷素淋失临界值研究  

Phosphorus Leaching Critical Values of Soil from Different Parent Materials in South China

作　　者：王荣萍[1] 丁效东[1] 廖新荣[1] 李淑仪[1] 薛石龙[1] 

机构地区：[1]广东省生态环境与土壤研究所,广州510650

出　　处：《中国农学通报》2014年第19期246-250,共5页Chinese Agricultural Science Bulletin

基　　金：广东省科学院青年科学研究基金项目"水溶性有机物对菜园土磷有效性的影响机制"(qnjj201011);广东省科技计划项目"珠三角菜园土磷素淋失综合调控技术研究"(2011B020309004);"华南菜地有机肥施用对红壤磷素淋洗低风险技术研究"(2012A020602031)

摘　　要：从广东省各蔬菜基地采集101个表层土壤,测定土壤Olsen-P、Bray-P和CaCl2-P,以确定不同质地土壤的磷淋失临界值。结果表明,Olsen-P与CaCl2-P呈显著的线性关系,随着土壤Olsen-P的增加,CaCl2-P也呈现增加的趋势,存在1个明显的突变点,即土壤磷淋失临界值,壤质粘土的临界值为79.74 mg/kg,粘壤土的临界值为51.08 mg/kg,砂质粘壤土的淋失临界值为43.99 mg/kg,砂质壤土的淋失临界值为8.63 mg/kg,淋失临界值从高到低的顺序依次是:壤质粘土>粘壤土>砂质粘壤土>砂质壤土,与不同质地粘粒含量的表现规律一致。在砂质粘壤土上Bray-P与CaCl2-P呈显著的线性关系,但不存在明显的突变点,在壤质粘土、粘壤土和砂质壤土上,Bray-P与CaCl2-P未呈现显著的线性关系,不存在明显的突变点。因此,在本试验条件下,Olsen-P可以作为不同质地土壤磷淋失临界值指标。The lost P from the soils would pose a risk to water quality. In this study, 101 soils were collectedfrom the vegetable soils in the Guangdong. The contents of Olsen-P, Bray-P and CaCl2-P were respectivelydetermined so that phosphorus leaching critical values was determined in different texture soils. The resultsshowed that： there was a significant linear relationship between Olsen-P and CaCl2-P. CaCl2-P increasedsharply with the increase of Olsen-P, which was called phosphorus leaching criterion. The criterion values ofloamy clay was 79.74 mg/kg, the values of clay loam was 51.08 mg/kg,the values of sandy clay loam was43.99 mg/kg, the values of sandy loam was 8.63 mg/kg. The order of criterion values was loamy clayclayloam〉sandy clay loam〉sandy loam, which was in agreement with the order of clay content. There was asignificant linear relationship between Bray-P and CaCl2-P in the sandy clay loam soils while there was not inthe rest three texture soils, but there was not change point in the sandy clay loam. The Olsen-P was as the criterion value of phosphorus leaching.

关 键 词：质地 OLSEN-P Bray-P CaCl2-P 淋失临界值 

分 类 号：X53[环境科学与工程—环境工程]