Does conversion from natural forest to plantation affect fungal and bacterial biodiversity, community structure, and co-occurrence networks in the organic horizon and mineral soil?
Does conversion from natural forest to plantation affect fungal and bacterial biodiversity, community structure, and co-occurrence networks in the organic horizon and mineral soil?
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DOI：
10.1016/j.foreco.2019.05.042
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发表时间：
2019-08-15
影响因子：
3.7
通讯作者：
Tateno, Ryunosuke
中科院分区：
文献类型：
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作者：
Nakayama, Masataka;Imamura, Shihomi;Tateno, Ryunosuke
树种影响有机层和矿质土壤的化学性质。微生物群落，包括真菌和细菌，是森林土壤养分循环的主要驱动力，可能会受到树种通过凋落物化学性质和根系分泌物的影响。因此，从天然林到种植园的转换可能会影响微生物群落。在这里，我们的目的是揭示从天然林转化为针叶种植园对土壤微生物群落结构，生物多样性和共生网络，以及土壤化学性质的影响。为此，我们调查了三种森林类型（阔叶落叶树木为主的天然林，两种类型的人工林）的有机层和矿物表土（0-10厘米深）的化学和微生物特性。森林类型对有机层C/N、pH和溶解性无机N等化学性质有显著影响，而对表层土壤除微生物生物量N和C外，其他化学性质无显著影响。不同森林类型和土壤pH值、C/N比的变化对有机层和表层土壤微生物群落结构的影响差异显著。微生物多样性指数没有显着差异的森林类型在任何一层，而微生物共生网络的矿物土壤中的天然林比人工林的网络更复杂和强大。因此，我们的研究结果表明，从天然林到针叶林种植园的转换可能会影响土壤化学性质和微生物群落结构的有机层，和微生物共生网络的矿物质表土，这些影响可能会根据种植的树种。
Tree species influence the chemical properties of the organic horizon and mineral soil. Microbial communities, including fungi and bacteria, which are the main drivers of nutrient cycles in forest soils, may be affected by tree species via litter chemical properties and root exudation. Therefore, conversion from natural forest to plantation could affect the microbial communities. Here, we aimed to reveal the effects of conversion from natural forest to coniferous plantation on soil microbial community structure, biodiversity, and co-occurrence networks, as well as soil chemical properties. For this purpose, we investigated chemical and microbial properties of the organic horizon and mineral topsoil (0-10 cm depth) in three forest types (a natural forest dominated by broad-leaved deciduous trees, and two types of plantations). Forest type had significant effects on chemical properties, including the C/N ratio, pH, and dissolved inorganic N of the organic horizon, while it had no significant effect on the chemical properties of topsoil, except for microbial biomass N and C. Microbial community structures in both the organic horizon and topsoil differed significantly among forest types and with changes in soil properties such as pH and C/N ratio. Microbial diversity indices did not significantly differ among forest types in either layer, while the microbial co-occurrence networks in the mineral soil of the natural forest were more complex and robust than the networks of plantations. Therefore, our results showed that conversion from natural forest to coniferous plantation could affect soil chemical properties and microbial community structure in the organic horizon, and the microbial co-occurrence network in the mineral topsoil; these impacts may vary according to the planted tree species.