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首页> 外文期刊>Mycologia >Plant community influences on soil microfungal assemblages in boreal mixed-wood forests
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Plant community influences on soil microfungal assemblages in boreal mixed-wood forests

机译：植物群落对北方混交林土壤微真菌组合的影响

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We studied the relationships between assemblages of soil microfungi and plant communities in the southern boreal mixed-wood forests of Quebec. Sampling took place in 18 100 m(2) plots from an existing research site. Plots were separated into three categories based on dominant overstory tree species: (i) trembling aspen, (ii) white birch and (iii) a mixture of white spruce and balsam fir. Within each plot a 1 m(2) subplot was established in which the understory herbaceous layer was surveyed and soil cores were collected. Microfungi were isolated from soil cores with the soil-washing technique and isolates were identified morphologically. To support our morphological identifications DNA sequences were obtained for the most abundant microfungi. The most frequently occurring microfungal species were Penicillium thomii, P. spinulosum, P. janthinellum, Penicillium sp., P. melinii, Trichoderma polysporum, T. viride, T. hamatum, Mortierella ramanniana, Geomyces pannorum, Cylindrocarpon didymum, Mortierella sp. and Mucor hiemalis. Multivariate analyses (redundancy analysis followed by variance partitioning) revealed that most of the variation in microfungal communities was explained by understory plant species composition as opposed to soil chemistry or overstory tree species. In this floristically diverse system saprophytic microfungal assemblages were not correlated with the overstory tree species but were significantly correlated with the main understory herbs, thereby reflecting differences at a smaller spatial scale.
机译：我们研究了魁北克南部北方混交林中土壤微真菌的集合与植物群落之间的关系。在现有研究站点的18 100 m（2）地块中进行了采样。根据主要的过度树种将地块分为三类：（i）颤抖的白杨，（ii）白桦和（iii）白云杉和苦瓜的混合物。在每个样地中，建立了一个1 m（2）的子样地，在该样地中调查了地下草本层并收集了土壤核心。用土壤洗涤技术从土壤核心中分离出微真菌，并在形态上鉴定出分离物。为了支持我们的形态学鉴定，获得了最丰富的微真菌的DNA序列。最常见的微真菌物种是thumii青霉，P。spinulosum，P。janthinellum，Penicillium sp。，melinii，多孢木霉，T。viride，T。hamatum，Mortierella ramanniana，Gonmyces pannorum，Cylindrocarpon didymum，Mortierella sp。和Mucor hiemalis。多变量分析（冗余分析，然后进行方差划分）显示，微真菌群落的大多数变化是由林下植物物种组成而不是土壤化学或林下树木物种引起的。在这个植物多样性的系统中，腐生性微真菌组合与上层树种无关，但与主要下层树种显着相关，从而反映出较小空间尺度上的差异。

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