不同树龄刺槐林丛枝菌根真菌的空间分布及与根际土壤因子的关系

doi:10.11707/j.1001-7488.20130813

Abstract

Abstract:

The relationships between arbuscular mycorrhizal (AM) fungi and soil factors in different soil layers of Robinia pseudoacacia plantation at different ages were studied in the hilly region of the Loess Plateau. The results showed that mycorrhizal infection rate and spore density of R. pseudoacacia plantation were higher in 0-20 cm soil layer than that in 20-40 cm soil layers at the same tree age. Moreover, mycorrhizal infection rates in the upper and lower soil layers and spore density in 20-40 cm soil layer were increased and then declined with tree age. The spore density in 0-20 cm soil layer gradually declined after two peaks with increasing of tree age. The highest mycorrhizal infection rate and the maximum spore density were observed in the 21-and 26-year-old plantation, respectively. Correlation analysis indicated that a very significantly positive correlation was observed between mycorrhizal infection rate, spore density and urease activities. Spore density showed a highly significantly positive correlation with available N, available P and alkaline phosphatase activities, but had a significantly negative correlation with soil pH. Total glomalin (TG) and easily extractable glomalin (EEG) had a highly significant positive correlation with soil organic carbon. Principal component analysis showed that available N, available P, available K and alkaline phosphatase activities were the key factors affecting mycorrhizal development of R. pseudoacacia and reflected soil nutrition status in the hilly region of the Loess Plateau. The experimental results were meaningful in further revealing internal relationship of "plant-soil-mycorhiza" and promoting ecological restoration using AM fungi in the Loess Plateau.

Key words: Robinia pseudoacacia, tree age, AM fungi, soil factors, spatial distribution, loess hilly region

CLC Number:

S718.81

Liu Zhenkun, Tian Shuai, Tang Ming. Spatial Distribution of Arbuscular Mycorrhizal Fungi and Its Relationship with Soil Factors in the Rhizosphere of Robinia pseudoacacia at Different Ages[J]. Scientia Silvae Sinicae, 2013, 49(8): 89-95.

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Spatial Distribution of Arbuscular Mycorrhizal Fungi and Its Relationship with Soil Factors in the Rhizosphere of Robinia pseudoacacia at Different Ages

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