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【目的】本文研究了丛枝菌根(arbuscular mycorrhiza)真菌地表球囊霉(Glomus versiforme)对枳[Poncirustrifoliata (L.) Raf]实生苗土壤中有效铁及各形态铁的影响。【方法】试验采用根袋技术,以主根为中心,通过32μm尼龙网(菌丝可以穿过尼龙网,而根系则被限制)将土壤分为0～2 cm、2～4 cm和4～8 cm三类水平土层。【结果】接种丛枝菌根真菌的土壤有效铁含量表现为:0～2 cm>2～4 cm>4～8 cm;接种丛枝菌根真菌降低了土壤中交换态铁、有机结合态铁及残渣态铁的含量;枳生长一年后,土壤中交换态铁、碳酸盐结合态铁和氧化锰结合态铁含量为0;菌根侵染率与土壤残渣态铁呈极显著正相关关系(P<0.01)。【结论】丛枝菌根真菌对土壤中矿质元素具有活化作用,并可以通过改变土壤中各形态铁的含量,从而促进有效铁含量的提高。
【Objective】 The objective of this study was to investigate the effects of arbuscular mycorrhizal fungi Glomus versiforme on available and morphological Fe in soil of Poncirus trifoliata (L.) Raf. 【Method】 The root bark technique was used in this experiment. The soil was divided into 0 ~ 2 cm, 2 ~ 4 cm and 4 ~ 8 through 32μm nylon mesh (the mycelium could pass through the nylon mesh while the root system was restricted) cm three levels of soil. 【Result】 The results showed that available iron content in soil was 0 ~ 2 cm> 2 ~ 4 cm> 4 ~ 8 cm. Inoculation of arbuscular mycorrhizal fungi reduced the content of exchangeable iron, organic bound iron And residual iron content. One year after the growth of trifoliate orange, the content of exchangeable iron, carbonate bound iron and manganese oxide in the soil was 0, and the mycorrhizal infection rate was significantly and positively correlated with soil residual iron Relationship (P <0.01). 【Conclusion】 Arbuscular mycorrhizal fungi can activate mineral elements in the soil and promote the increase of available iron content by changing the contents of various forms of iron in the soil.