Restoration age and reintroduced bison may shape soil bacterial communities in restored tallgrass prairies
Restoration age and reintroduced bison may shape soil bacterial communities in restored tallgrass prairies
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DOI：
10.1093/femsec/fiad007
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发表时间：
2023-03-14
影响因子：
4.2
通讯作者：
Swingley, Wesley D.
中科院分区：
文献类型：
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作者：
Barber, Nicholas A.;Klimek, Desirae M.;Swingley, Wesley D.
重新引入的野牛推动土壤微生物群落沿着一个新的演替轨迹在恢复的草原。土壤群落多样性和组成的变化后恢复，但这些演替的变化轨迹可能会受到干扰生境管理。我们研究了土壤细菌群落恢复tallgrass草原时序>6年，记录如何多样性和组成的变化与年龄，通过火灾管理，放牧重新引入野牛，并在恢复前的农田和残留的草原。土壤C：N随恢复年限和野牛的增加而增加，土壤pH随恢复年限先增加后下降，尽管野牛减弱了这种格局。细菌的丰富度和多样性遵循类似的驼峰形的模式，土壤pH值，使最古老的植被接近残草原的低多样性。β-多样性模式表明，在较老的野牛群落中的组成类似于无野牛的地点，但随着时间的推移，它们变得更加不同。相比之下，在整个研究过程中，与野牛的年轻群落保持着独特的组成，这表明野牛的干扰可能会导致不同的演替轨迹。我们使用了一种新的随机森林方法来识别表明这些差异的类群，发现它们经常与其他草原上对放牧有反应的细菌有关。
Reintroduced bison drive soil microbial communities along a new successional trajectory in restored prairies.Knowledge of how habitat restoration shapes soil microbial communities often is limited despite their critical roles in ecosystem function. Soil community diversity and composition change after restoration, but the trajectory of these successional changes may be influenced by disturbances imposed for habitat management. We studied soil bacterial communities in a restored tallgrass prairie chronosequence for >6 years to document how diversity and composition changed with age, management through fire, and grazing by reintroduced bison, and in comparison to pre-restoration agricultural fields and remnant prairies. Soil C:N increased with restoration age and bison, and soil pH first increased and then declined with age, although bison weakened this pattern. Bacterial richness and diversity followed a similar hump-shaped pattern as soil pH, such that the oldest restorations approached the low diversity of remnant prairies. beta-diversity patterns indicated that composition in older restorations with bison resembled bison-free sites, but over time they became more distinct. In contrast, younger restorations with bison maintained unique compositions throughout the study, suggesting bison disturbances may cause a different successional trajectory. We used a novel random forest approach to identify taxa that indicate these differences, finding that they were frequently associated with bacteria that respond to grazing in other grasslands.