丛枝菌根真菌对枳根围不同形态铁的影响

Effects of arbuscular mycorrhizal fungi on different iron species in Poncirus trifoliata rhizospheric soil

摘要:

摘要：【目的】本文研究了丛枝菌根（arbuscular mycorrhiza）真菌地表球囊霉（Glomus versiforme）对枳（Poncirus trifoliata 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32 μm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

Abstract:

Abstract: [Objective] We studied the effects of arbuscular mycorrhizal (AM) fungus (Glomus versiforme) on iron species at different trifoliate orange [Poncirus trifoliata (L.) Raf.] rhizospheric soil with pot culture. [Methods] The soil range in horizon was separated into 0-2 cm, 2-4 cm and 4-8 cm away from the citrus taproot by nylon bags with 32 μm sieve, which citrus roots could not across but AM hyphae could. Mycorrhizal colonization was testified by trypan blue staining method. Iron species contents were quantified by atomic spectrometry, and phosphorus contents was through phospho-vanado- molybdate colorimetry. [Results] Available iron contents in AM treatment were followed the order by 0-2 cm > 2-4 cm > 4-8 cm. AM fungus decreased the contents of Exch-Fe, OM-Fe, RES-Fe. The concentration of Exch-Fe, Carb-Fe and MnOX-Fe became zero one year later. AM colonization was significantly positive relation with RES-Fe (P<0.01) [Conclusion] Arbuscular mycorrhizal fungi could affect the activation on mineral elements, and improve the available iron contents through the changes on iron species in soil.