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测定了两种不同质地土壤小麦根际土及非根际土中不同形态有机碳、氮的含量及特性。结果表明,粘壤土及砂质壤土两种不同质地土壤小麦根际土中有机碳、可溶性有机碳(WEOC),土壤全氮、可溶性有机氮(WEON)、游离氨基酸及硝态氮和铵态氮均显著高于非根际土;根际土及非根际土中WEON的含量均高于硝态氮及铵态氮含量,其在根-土界面氮素转化中的作用值得关注。不同质地土壤相比,粘壤土中各指标的含量均显著高于砂质壤土。根际土有机碳矿化累积量及矿化率均高于非根际土;培养期间粘壤土释放的CO2量明显低于沙质壤土,这可能与粘壤土粘粒含量高,对土壤有机碳的保护作用有关。
The contents and characteristics of different forms of organic carbon and nitrogen in rhizosphere soils and non-rhizosphere soils of two wheat cultivars with different soil textures were determined. The results showed that soil organic carbon, dissolved organic carbon (WEOC), soil total nitrogen, dissolved organic nitrogen (WEON), free amino acids and nitrate nitrogen and ammonium nitrogen in the rhizospheric soils of two soil textures, clay soil and sandy loam soil, The contents of WEON in rhizosphere soil and non-rhizosphere soil were higher than those in nitrate nitrogen and ammonium nitrogen, and their role in nitrogen transformation at root-soil interface deserved our attention. Compared with sandy soils, the content of each index in clay loam was significantly higher than that of sandy loam. The amount of organic carbon mineralization and mineralization rate in rhizosphere soil were higher than those in non-rhizosphere soil. The amount of CO2 released by clay loam soil during cultivation was significantly lower than that of sandy loam soil, which may be related to the high clay content of clay loam soil, The protection of the role.