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Translocating subtropical forest soils to a warmer region alters microbial communities and increases the decomposition of mineral-associated organic carbon
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.soilbio.2020.107707
Xiong Fang , Guoyi Zhou , Chao Qu , Wenjuan Huang , Deqiang Zhang , Yuelin Li , Zhigang Yi , Juxiu Liu

It is not clear how soil organic carbon (SOC) and its related microbial processes respond to climate warming in subtropical forest, which limits our ability to predict the response and feedback of such forests to future warming. Here, we translocated a forest microcosm from a high-elevation site to a low-elevation site (600 m–30 m a.s.l.) in a subtropical forest, to study the responses of SOC fractions, microbial communities and enzyme activities to increases in soil temperature (ca. 1.69 °C). Results showed that translocation to a warmer region significantly decreased the total SOC content by an average of 21.1% after three years of soil warming. Warming non-significantly decreased the particulate organic C (POC) and microbial C (MBC) content by 15.7% and 15.2%, respectively, and increased the light fraction organic C (LFOC) and dissolved organic C (DOC) content by 15.5% and 2.3%, respectively. By contrast, warming significantly decreased the <53 μm fraction organic C (N-POC, −15.3%) and heavy fraction organic C (HFOC, −14.8%) content. Warming significantly decreased the relative abundance of total bacteria (−2.7%), G+ bacteria (−6.1%), G bacteria (−6.6%) and actinomycetes (−10.8%), but increased the relative abundance of fungi (+22%). The oxidase and mass-specific oxidase activities were significantly increased by 32–70% in the warming soils. The decline in the N-POC was highly correlated to the increases in the relative abundance of fungi, the ratio of fungal to bacterial biomass (F:B), oxidase and mass-specific oxidase activities. Our results suggest that climate warming may increase the potential for fungal decomposition of mineral-associated organic C by increasing oxidase activities, leading to greater C losses in the subtropical forest than previously estimated.



中文翻译:

将亚热带森林土壤迁移到较暖的地区会改变微生物群落并增加与矿物相关的有机碳的分解

尚不清楚土壤有机碳(SOC)及其相关的微生物过程如何对亚热带森林的气候变暖作出反应,这限制了我们预测此类森林对未来变暖的反应和反馈的能力。在这里,我们将亚热带森林中的森林缩影从高海拔站点转移到低海拔站点(600 m–30 m asl),以研究SOC组分,微生物群落和酶活性对土壤温度升高的响应(约1.69°C)。结果表明,土壤变暖三年后,向更温暖区域的迁移显着降低了总SOC含量平均21.1%。变暖无显着降低颗粒有机碳(POC)和微生物碳(MBC)的含量分别为15.7%和15.2%,分别使轻质有机碳含量(LFOC)和溶解有机碳含量(DOC)分别增加了15.5%和2.3%。相比之下,升温显着降低了<53μm的有机碳含量(N-POC,-15.3%)和重的有机碳含量(HFOC,-14.8%)。变暖显着降低了总细菌的相对丰度(-2.7%),G+细菌(-6.1%),G -菌(-6.6%)和放线菌(-10.8%),但增加真菌的相对丰度(+ 22%)。在变暖的土壤中,氧化酶和质量比氧化酶的活性显着增加了32–70%。N-POC的下降与真菌的相对丰度,真菌与细菌生物量的比率(F:B),氧化酶和质量特异性氧化酶活性的增加高度相关。我们的结果表明,气候变暖可能会通过增加氧化酶的活性来增加与矿物相关的有机碳的真菌分解的可能性,从而导致亚热带森林中的碳损失比以前估计的更大。

更新日期:2020-01-14
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