Soil pH-induced changes in root colonization, diversity, and reproduction of symbiotic arbuscular mycorrhizal fungi from healthy and declining maple forests

被引:102
作者
Coughlan, AP [1 ]
Dalpé, Y
Lapointe, L
Piché, Y
机构
[1] Univ Laval, Fac Foresterie & Geomat, Ctr Rech Biol Forestiere, Ste Foy, PQ G1K 7P4, Canada
[2] Ctr Rech Est Cereales & Oleagineux, Ottawa, ON K1A 0C6, Canada
[3] Univ Laval, Dept Biol, Ste Foy, PQ G1K 7P4, Canada
关键词
D O I
10.1139/cjfr-30-10-1543
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Acer saccharum Marsh. (sugar maple) is one of only few arbuscular mycorrhizal trees to form extensive stands in northern temperate biomes. Recent maple decline could result from altered intensity and quality of root colonization by associated mycobionts or possible shifts in symbiotic fungal community composition following environmental stresses. In this study the effects on arbuscular mycorrhizal fungi of soil acidification, one of several proposed causal stresses underlying forest decline, and remedial liming were investigated under glasshouse conditions. Acer saccharum seedlings were grown in unsterilized, pH altered, forest soils from healthy and declining maple stands. Over a range of treatment pHs normally tolerated by A. saccharum, fungal populations and responses to pH changes differed between the two soils. The declining site with more acidic soil had an initially larger spore population but lower taxonomic diversity than the healthy site. However, liming stimulated sporulation of several taxa initially apparently absent from the declining site spore population. The quantity of colonization generally increased with pH for both sites. Five Glomus taxa and Scutellospora calospora (Nicol. & Gerd.) Walker & Sanders are added to the list of fungi known to form arbuscular mycorrhizas with A. saccharum, and the known range of Acaulospora cavernata Blaszkowski is extended from Poland to eastern North America.
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页码:1543 / 1554
页数:12
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