ABSTRACT

Global climate changes such as prolonged duration and intensity of drought can lead to adverse ecological consequences in forests. Currently little is known about soil microbial community responses to such drought regimes in tropical forests. In this study, we examined the resistance and resilience of topsoil prokaryotic communities to a prolongation of the dry season in terms of diversity, community structure and co-occurrence patterns in a French Guianan tropical forest. Through excluding rainfall during and after the dry season, a simulated prolongation of the dry season by five months was compared to controls. Our results show that prokaryotic communities increasingly diverged from controls with the progression of rain exclusion. Furthermore, prolonged drought significantly affected microbial co-occurrence networks. However, both the composition and co-occurrence networks of soil prokaryotic communities immediately ceased to differ from controls when precipitation throughfall returned. This study thus suggests modest resistance but high resilience of microbial communities to a prolonged drought in tropical rainforest soils.

中文翻译：

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热带森林中土壤原核生物群落对长期干旱的抵抗力和恢复力

摘要

全球气候变化，如干旱持续时间和强度的延长，可能会对森林造成不利的生态后果。目前，人们对热带森林中土壤微生物群落对此类干旱状况的反应知之甚少。在这项研究中，我们研究了法属圭亚那热带森林中表土原核生物群落对旱季延长的多样性、群落结构和共生模式的抵抗力和恢复力。通过排除旱季期间和之后的降雨，将旱季模拟延长五个月与对照进行比较。我们的结果表明，随着雨水排除的进展，原核生物群落越来越偏离对照。此外，长期干旱显着影响了微生物共生网络。然而，当降水恢复时，土壤原核生物群落的组成和共生网络立即不再与对照不同。因此，这项研究表明，微生物群落对热带雨林土壤中的长期干旱具有适度的抵抗力，但具有很高的恢复力。