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中国农学通报

中国农学通报 ›› 2014, Vol. 30 ›› Issue (19): 246-250.doi: 10.11924/j.issn.1000-6850.2013-2410

所属专题： 园艺

• 林学 园艺 园林 • 上一篇    下一篇

华南地区蔬菜地不同质地土壤磷素淋失临界值研究

王荣萍 丁效东 廖新荣 李淑仪 薛石龙   

  • 收稿日期:2013-09-10 修回日期:2013-10-16 出版日期:2014-07-05 发布日期:2014-07-05
  • 基金资助:
    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)。

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

  • Received:2013-09-10 Revised:2013-10-16 Online:2014-07-05 Published:2014-07-05

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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。

关键词: 计算方法, 计算方法

Abstract: The lost P from the soils would pose a risk to water quality. In this study, 101 soils were collected from the vegetable soils in the Guangdong. The contents of Olsen-P, Bray-P and CaCl2-P were respectively determined so that phosphorus leaching critical values was determined in different texture soils. The results showed that: there was a significant linear relationship between Olsen- P and CaCl2- P. CaCl2- P increased sharply with the increase of Olsen-P, which was called phosphorus leaching criterion. The criterion values of loamy clay was 79.74 mg/kg, the values of clay loam was 51.08 mg/kg，the values of sandy clay loam was 43.99 mg/kg, the values of sandy loam was 8.63 mg/kg. The order of criterion values was loamy clay＞clay loam＞sandy clay loam＞sandy loam, which was in agreement with the order of clay content. There was a significant linear relationship between Bray-P and CaCl2-P in the sandy clay loam soils while there was not in the 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.