Interkingdom plant-microbial ecological networks under selective and clear cutting of tropical rainforest
Interkingdom plant-microbial ecological networks under selective and clear cutting of tropical rainforest
复制标题
热带雨林择伐皆伐下的界间植物-微生物生态网络
DOI：
10.1016/j.foreco.2021.119182
复制
发表时间：
2021-04-07
影响因子：
3.7
通讯作者：
Xu, Han
中科院分区：
文献类型：
--
作者：
Chen, Jie;Feng, Kai;Xu, Han
最近的研究表明，地下元群落中的王国间关系可能比物种多样性对生态系统功能的贡献更大。虽然森林砍伐对地上相互作用的影响已得到充分研究，但植物、土壤细菌和真菌群落之间的相互作用对森林砍伐的反应仍知之甚少，而它们对植被恢复的影响仍然未知。我们对海南岛典型热带雨林中没有采伐历史的原始林和经过砍伐或选择性砍伐并留置恢复长达 50 年的次生林的土壤 16S rRNA 和 ITS 基因进行了测序。通过生态网络分析阐明土壤细菌-真菌、植物-细菌和植物-真菌的关联性，并检查它们与植物组成、土壤和凋落物特性的相关性，以探讨其与生态系统功能的联系。在选择性砍伐点中发现细菌-真菌相互作用的负比例较高，而在砍伐点中细菌-真菌相互作用的正比例较高。选择性砍伐后的变化与树木组成以及土壤和凋落物中氮磷含量的减少有关，表明对养分的竞争加剧、群落脱钩和生态位分化。砍伐后细菌-真菌相互作用的变化与树木生物量和土壤碳含量的减少有关，同时凋落物碳含量的增加有关，这意味着营养策略和群落均质化方面的合作增加。明确切割后细菌-真菌相互作用的这种生态意义也适用于植物-微生物相互作用，显示出模块化结构和强大的跨模块关联，以及与凋落物碳和土壤氮可用性的显着相关性，这表明特定植物物种下由碳和氮含量变化驱动的微生物成员的特定集合。总体而言，细菌-真菌和植物微生物相互作用对选择性砍伐的反应可能会促进森林恢复过程中植物多样性的恢复，而这些对皆伐的反应可能会阻碍植物群落多样性的恢复，并且需要基于不同树种种植的更昂贵的恢复方法。这项研究表明，地下元群落中的界间相互作用表明了砍伐森林恢复过程中树木组成和土壤肥力的变化，而这种界间相互作用的变化反过来又会影响植物多样性和土壤养分转化。
Recent studies have revealed that interkingdom relationships in below-aboveground metacommunity may contribute to ecosystem functions more than species diversity. While effects of deforestation on aboveground interactions have been well studied, the responses of interactions among plant, soil bacterial and fungal communities to deforestation are pooly understood and their effects on vegetation restoration remain unknown. We sequenced soil 16S rRNA and ITS genes from the primary forest without logging history and secondary forests that had been clear cut or selective cut and left to recover for up to 50 years in the typical tropical rainforest in Hainan Island. Soil bacterial-fungal, plant-bacterial and plant-fungal associations were illustrated via ecological network analysis, and their correlations with plant composition, soil and litter properties were examined to explore the links to ecosystem functions.A higher negative proportion of bacterial-fungal interactions was found in selective cut sites while a higher positive proportion presented in clear cut sites. The changes after selective cut was related to tree composition and reductions in nitrogen and phosphorus content from soil and litter, indicating increased competition for nutrients, decoupling of communities and niche differentiation. The bacterial-fungal interaction changes after clear cut was associated with decrease in tree biomass and soil carbon content while increase in litter carbon content, implying increased co-operation in nutrient strategies and community homogenization. This ecological implications of bacterial-fungal interaction after clear cut was also applicable to plant-microbial interaction showing modular structure and strong across-module associations and significant correlations with litter carbon and soil nitrogen availability, which was indicative of a particular collection of microbial members under given plant species driving by changes in carbon and nitrogen content. Overall, the responses of bacterial-fungal and plant?microbe interactions to selective cut may in term promote the recovery of plant diversity during forest restoration, whereas these responses to clear cut may hinder the recovery of plant community diversity, and more costly restoration approaches based on different tree species planting will be required. This study suggested that the interkingdom interactions in below-aboveground metacommunity are indicative of changes in tree composition and soil fertility during the restoration of logged forest, and changes in such interkingdom interactions could in turn influence plant diversity and soil nutrients transformation.