Department of Biology, Syracuse University, 107 College Place, Syracuse, NY 13244, USA.
Mycorrhiza. 2013 Apr;23(3):243-9. doi: 10.1007/s00572-012-0469-4. Epub 2012 Nov 24.
Although a number of factors have predictable effects on mycorrhizal colonization, determining generalized patterns for some variables have remained elusive. In particular, fire has been identified as a major event that may influence plant-mycorrhiza interactions, yet efforts to date have yielded contradictory results. Here, we assess the impact of fire on mycorrhizal colonization in Palafoxia feayi, a plant commonly found in the fireswept, nutrient-poor scrub community of central Florida. We determined soil nutrient conditions and percent colonization patterns for plants growing in replicate plots that were burned 1 to 15 years previously. The results showed a negative relationship between mycorrhizal colonization and time since fire, but there was no effect of fire return interval (lapsed time between successive fires). Soil nutrient analyses corroborated previous studies and showed no change in soil nutrients following fire. In contrast to previous studies of mycorrhizal colonization in Florida scrub, we conclude that fire can affect arbuscular mycorrhizal fungi colonization and we speculate that this is mediated by light availability.
尽管许多因素对菌根定殖有可预测的影响，但某些变量的一般模式仍然难以确定。特别是，火灾已被确定为可能影响植物-菌根相互作用的主要事件，但迄今为止的努力产生了相互矛盾的结果。在这里，我们评估了火灾对佛罗里达州中部火灾频发、养分贫瘠的灌木丛中常见植物 Palafoxia feayi 菌根定殖的影响。我们确定了在 1 到 15 年前被烧毁的重复样地中植物的土壤养分状况和定殖百分率模式。结果表明，菌根定殖与火灾发生时间之间呈负相关，但火灾返回间隔（连续火灾之间的时间间隔）没有影响。土壤养分分析证实了先前的研究结果，表明火灾后土壤养分没有变化。与佛罗里达州灌木丛中菌根定殖的先前研究相反，我们得出结论，火灾会影响丛枝菌根真菌的定殖，我们推测这是由光可用性介导的。
