Ectomycorrhizal fungi in association with Pinus sylvestris seedlings promote soil aggregation and soil water repellency
Ectomycorrhizal fungi in association with Pinus sylvestris seedlings promote soil aggregation and soil water repellency
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DOI：
10.1016/j.soilbio.2014.07.015
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发表时间：
2014-11
影响因子：
9.7
通讯作者：
Weishuang Zheng;E. Morris;M. Rillig
中科院分区：
文献类型：
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作者：
Weishuang Zheng;E. Morris;M. Rillig
真菌对土壤团聚体影响的研究一直严重偏向于丛枝菌根。尽管外生菌根真菌被认为在对土壤结构的贡献方面与丛枝菌根真菌和腐生性真菌一样重要，但关于该主题的实验研究却很少。本文研究了9种外生菌根真菌与樟子松幼苗共生对桑迪壤土土壤团聚体和土壤斥水性的影响。当植物与双色蜡蚧、漆蜡蚧、乳菇、卷叶桩菇和牛肝菌共生时，水稳性团聚体（直径>0.25 mm）增加6-12%。平均重量直径（MWD）的土壤团聚体也增加，主要是在2-4毫米直径的大小类。颗粒乳牛肝菌增加了水稳性团聚体的分子量分布，而玫瑰乳牛肝菌和褐乳牛肝菌增加了水稳性团聚体的分子量分布，但对水稳性团聚体的分子量分布没有影响。此外，还发现黑乳杆菌、玫瑰红球菌和黄曲霉对SWR有促进作用。菌丝长度与分子量分布呈弱相关（R= 0.27，P < 0.05），尤其与2-4 mm大小的聚集体质量呈弱相关（R= 0.32，P < 0.05）。然而，我们不能确定明确的土壤效应（土壤pH值，土壤蛋白质含量）作为解释无论是土壤团聚体或SWR。因此，我们得出结论，真菌和土壤结构之间的相互作用是一个物种依赖的过程，尚未被表征的真菌性状的基础上。我们的研究结果增加了进一步的证据，从直接实验外生菌根真菌可以有助于土壤团聚体和土壤水电阻。
Research on fungal effects on soil aggregation has been heavily biased towards arbuscular mycorrhiza. Even though ectomycorrhizal fungi are thought to be as important as arbuscular mycorrhizal fungi and saprotrophic fungi in contributing to soil structure, there are few experimental studies on this topic. Here we quantified how nine ectomycorrhizal fungi in association withPinus sylvestrisseedlings affected soil aggregation and soil water repellency (SWR) of a sandy loamy soil. Water-stable aggregates (>0.25 mm diameter) increased by 6–12% when plants were associated withLaccaria bicolor,Laccaria laccata,Lactariustheiogalus,Paxillus involutusandSuillus bovinus. Mean weight diameter (MWD) of soil aggregates also increased, primarily in the 2–4 mm diameter size class. However,Suillus granulatusincreased water-stable aggregates but not MWD, converselyRhizopogon roseolusandSuillus luteusincreased MWD but not water-stable aggregates. We also foundLt.theiogalus,R. roseolusandS. luteuspromoted SWR. Furthermore, hyphal length was weakly correlated with MWD (R= 0.27,P< 0.05), especially with aggregate mass in the 2–4 mm size class (R= 0.32,P< 0.05). However, we could not identify clear soil effects (soil pH, soil protein content) serving as explanation for either soil aggregation or SWR. Thus, we conclude that interactions between fungi and soil structure are a species-dependent processes based on yet to be characterized fungal traits. Our results have added further evidence from direct experimentation that ectomycorrhizal fungi can contribute to soil aggregation and SWR.