不同温室蔬菜种植模式下土壤磷素形态分布与转化  

Soil Phosphorus Fraction and Transformation Under Different Production Modes of Greenhouse Vegetables

作　　者：李婠婠 滕艳敏[1] 李季[1] LI Wanwan;TENG Yanmin;LI Ji(College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China)

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《土壤》2020年第2期271-278,共8页Soils

基　　金：国家重点研究发展计划项目(2016YFD0800601)资助。

摘　　要：采用蒋柏藩-顾益初无机磷分级浸提法,研究了15a长期有机、综合和常规种植3种温室蔬菜生产体系下石灰性土壤磷形态分布及转化特征。结果表明:种植模式及施肥年限对土壤有机磷含量和各形态无机磷含量均有显著影响,且交互作用显著。随着施肥时间延长,3种种植模式土壤有机磷含量与无机磷形态Ca2-P、Ca8-P、Fe-P含量不断升高,Al-P、O-P、Ca10-P含量呈现不规则变动,差异较小;有机模式土壤有机磷含量与无机磷形态Ca2-P、Ca8-P、Fe-P含量均高于常规和综合模式,O-P、Ca10-P含量略小于常规和综合模式。在各磷素占比中,中等活性磷源(Ca8-P、Fe-P、Al-P)>潜在磷源(O-P、Ca10-P)>有效磷源(Ca2-P)。表层土中有机磷占全磷的8%~23%,亚表层土中有机磷占全磷的6%~13%。有机模式促进了无机磷各形态之间、有机磷和无机磷形态之间的转化过程,0~20 cm土层的磷素转化比20~40 cm更活跃。The study focuses on phosphoru(P)fractions and transformation in calcareous soil in a 15-year experiment under organic,integrated and conventional production modes of greenhouse vegetables.The hierarchical extraction method of inorganic P was used to analyze the distribution of inorganic P fractions.The results showed that production mode,fertilization year and their interaction all had significant effects on the contents of organic P and inorganic P fractions.With the increase of fertilization year,the contents of organic P,Ca2-P,Ca8-P and Fe-P under three production modes were continuously increased,but the contents of Al-P,O-P and Ca10-P changed irregularly with small variances.The contents of organic P,Ca2-P,Ca8-P and Fe-P under organic production mode were higher than those under integrated and conventional production modes,while the contents of O-P and Ca10-P under organic production mode were lower than those under integrated and conventional production modes.The proportion of P fractions was in an order of moderate-activity P sources(Ca8-P,Fe-P,Al-P)>potential P sources(O-P,Ca10-P)>available P source(Ca2-P).Organic P content accounted for 8%-23%and 6%-13%of total P content in 0-20 and 20-40 cm soils,respectively.The organic production mode could promote the transformation between inorganic P fractions and between organic P and inorganic P fractions,and it was more active in 0-20 cm soil than in 20-40 cm soil.

关 键 词：有机生产体系 有机肥 无机磷形态 有机磷 

分 类 号：S157.4[农业科学—土壤学]