Structuring Life After Death: Plant Leachates Promote CO2 Uptake by Regulating Microbial Biofilm Interactions in a Northern Peatland Ecosystem
Structuring Life After Death: Plant Leachates Promote CO2 Uptake by Regulating Microbial Biofilm Interactions in a Northern Peatland Ecosystem
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构建死后生命：植物渗滤液通过调节北部泥炭地生态系统中微生物生物膜相互作用促进二氧化碳吸收
DOI：
10.1007/s10021-023-00820-w
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发表时间：
2023
期刊：
影响因子：
3.7
通讯作者：
Wyatt, Kevin H.
中科院分区：
文献类型：
--
作者：
Rober, Allison R.;Lankford, Allyson J.;Kane, Evan S.;Turetsky, Merritt R.;Wyatt, Kevin H.
与气候变化相关的植物功能群的变化有可能通过改变水生微生物生物膜可用的有机物质的数量和组成来影响泥炭地碳储存。本研究的目的是评估潜在的植物补贴，以调节生态系统碳通量（CO2）的主要生产者（微藻）和异养分解（异养细菌）的相对比例在阿拉斯加沼泽水生生物膜的发展。我们评估了生物膜组成和CO2通量内围隔有和没有营养物质（氮和磷），有机碳（葡萄糖），和常见的泥炭地植物（苔藓，莎草，灌木，马尾）的沥滤液。实验中围生态系统暴露于自然阳光下或放置在黑暗的树冠下，以评估分解者对营养物质和碳补贴的反应，分别有和没有藻类。藻类受无机营养盐的限制，异养细菌受有机碳的限制。有机物的质量变化很大，植物和渗滤液的养分含量，更比碳质量，影响生物膜的组成。通过减轻藻类的营养限制，植物渗滤液转移生物膜群落向自养的光透明的处理，导致在CO2排放量显着减少相比，控制。没有藻类光合作用的平衡，异养生物膜显着增强CO2排放量的存在下，在黑暗中的植物沥滤液。这些结果表明，植物不仅通过光合作用直接促进碳吸收，而且还通过替代物--光养微生物间接促进碳吸收。
Shifts in plant functional groups associated with climate change have the potential to influence peatland carbon storage by altering the amount and composition of organic matter available to aquatic microbial biofilms. The goal of this study was to evaluate the potential for plant subsidies to regulate ecosystem carbon flux (CO2) by governing the relative proportion of primary producers (microalgae) and heterotrophic decomposers (heterotrophic bacteria) during aquatic biofilm development in an Alaskan fen. We evaluated biofilm composition and CO2flux inside mesocosms with and without nutrients (both nitrogen and phosphorus), organic carbon (glucose), and leachates from common peatland plants (moss, sedge, shrub, horsetail). Experimental mesocosms were exposed to either natural sunlight or placed under a dark canopy to evaluate the response of decomposers to nutrients and carbon subsidies with and without algae, respectively. Algae were limited by inorganic nutrients and heterotrophic bacteria were limited by organic carbon. The quality of organic matter varied widely among plants and leachate nutrient content, more so than carbon quality, influenced biofilm composition. By alleviating nutrient limitation of algae, plant leachates shifted the biofilm community toward autotrophy in the light-transparent treatments, resulting in a significant reduction in CO2emissions compared to the control. Without the counterbalance from algal photosynthesis, a heterotrophic biofilm significantly enhanced CO2emissions in the presence of plant leachates in the dark. These results show that plants not only promote carbon uptake directly through photosynthesis, but also indirectly through a surrogate, the phototrophic microbes.