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

摘要/Abstract

摘要：

对黄土高原丘陵区不同树龄刺槐林的2个土层丛枝菌根真菌与土壤因子的关系进行研究。结果表明: 相同树龄刺槐林菌根侵染率与孢子密度均为0~20 cm土层高于20~40 cm土层。上下土层菌根侵染率和20~40 cm土层的孢子密度随着树龄的增大先增加后降低,而0~20 cm土层的孢子密度随着树龄的增大在出现2次高峰后逐渐降低,最高菌根侵染率和最大孢子密度分别出现在树龄21年和26年。相关性分析表明: 菌根侵染率和孢子密度与脲酶极显著正相关; 孢子密度与碱解氮、速效磷、碱性磷酸酶极显著正相关,与pH值极显著负相关; 总球囊霉素、易提取球囊霉素与有机碳极显著正相关。主成分分析表明: 碱解氮、速效磷、速效钾和碱性磷酸酶是影响刺槐菌根发育和反映黄土高原丘陵区营养状况的主要因子。

关键词: 刺槐, 树龄, 丛枝菌根真菌, 土壤因子, 空间分布, 黄土丘陵区

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

中图分类号:

S718.81

刘振坤, 田帅, 唐明. 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[J]. 林业科学, 2013, 49(8): 89-95.

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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