石灰土地区几种作物根际与非根际土壤养分特征对比研究——以重庆市中梁山为例

Comparative Study on Nutrient Characteristics of Several Crops′ Rhizosphere and Non-rhizosphere Soils in Lime Soil Area——A Case Study of Zhongliang Mountain,Chongqing City

以重庆市中梁山石灰土地区为研究区,选择莴笋、红菜苔、白菜、瓢儿菜和桔子5种不同的作物,通过野外采样和室内实验分析的方法,分别测定了5种作物的根际与非根际土壤的全氮、全磷、全钾、水解氮、速效磷、速效钾、有机质的含量以及土壤pH值,并进行了对比分析。结果表明,根际与非根际土壤的全氮、全磷、全钾、水解氮、速效磷、速效钾、有机质和pH值之间均表现出显著的差异性(p<0.05)。这5种作物的养分含量除了桔子树的根际土壤速效磷出现亏缺外,其余4种作物根际土壤的全氮、全磷、全钾、水解氮、速效磷以及速效钾都高于非根际土壤,不同作物出现了不同程度的富集现象。另外,根际土壤的pH值均低于非根际土壤;根际土壤有机质含量均高于于非根际土壤。

Taking the lime soil area in Zhongliang Mountain, Chongqing City as a case, five kinds of crops- Lactucapsativap L. var. asparaginap Bailey, Brassica compestris , Brassica pekinensis , Brassica narinosa , Citrus reticulata were selected, by way of field sampling and laboratory analysis to investigate the nutrient contents, namely, total nitrogen, hydrolyzable nitrogen, total phosphorus, available phosphorus, total po- tassium and available potassium of their rhizosphere and non-rhizosphere soils, and the pH value and the con- tent of organic matter. The results show that there are significant differences between nutrient contents, the pH values and the contents of organic matter in rhizosphere and non-rhizosphere soils（p〈0.05）. Among the five crops, only the available phosphorus of orange trees＇ rhizosphere soil is insufficient, and nutrient con- tents of the other crops＇ rhizosphere soils are all higher than non-rhizosphere soil, having enrichment phe nomenon in various degrees. Besides, the five kinds of crops＇ pH values of rhizosphere soils are all lower than their non-rhizosphere soil and the organic matter contents of rhizosphere soils are all obviously higher than those of the non-rhizosphere soils.