Wang Xiaodong, Li Yong, Yan Zhongqing, Hao Yanbin, Kang Enze, Zhang Xiaodong, Li Meng, Zhang Kerou, Yan Liang, Yang Ao, Niu Yuechuan, Kang Xiaoming
Wetland Research Center, Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing, China.
Beijing Key Laboratory of Wetland Services and Restoration, Beijing, China.
Front Plant Sci. 2022 Sep 8;13:986034. doi: 10.3389/fpls.2022.986034. eCollection 2022.
Soil microbial communities are crucial in ecosystem-level decomposition and nutrient cycling processes and are sensitive to climate change in peatlands. However, the response of the vertical distribution of microbial communities to warming remains unclear in the alpine peatland. In this study, we examined the effects of warming on the vertical pattern and assembly of soil bacterial and fungal communities across three soil layers (0-10, 10-20, and 20-30 cm) in the Zoige alpine peatland under a warming treatment. Our results showed that short-term warming had no significant effects on the alpha diversity of either the bacterial or the fungal community. Although the bacterial community in the lower layers became more similar as soil temperature increased, the difference in the vertical structure of the bacterial community among different treatments was not significant. In contrast, the vertical structure of the fungal community was significantly affected by warming. The main ecological process driving the vertical assembly of the bacterial community was the niche-based process in all treatments, while soil carbon and nutrients were the main driving factors. The vertical structure of the fungal community was driven by a dispersal-based process in control plots, while the niche and dispersal processes jointly regulated the fungal communities in the warming plots. Plant biomass was significantly related to the vertical structure of the fungal community under the warming treatments. The variation in pH was significantly correlated with the assembly of the bacterial community, while soil water content, microbial biomass carbon/microbial biomass phosphorous (MBC/MBP), and microbial biomass nitrogen/ microbial biomass phosphorous (MBN/MBP) were significantly correlated with the assembly of the fungal community. These results indicate that the vertical structure and assembly of the soil bacterial and fungal communities responded differently to warming and could provide a potential mechanism of microbial community assembly in the alpine peatland in response to warming.
土壤微生物群落对生态系统层面的分解和养分循环过程至关重要，并且对泥炭地的气候变化很敏感。然而，在高寒泥炭地中，微生物群落垂直分布对变暖的响应仍不清楚。在本研究中，我们在增温处理下，研究了增温对若尔盖高寒泥炭地三个土层（0-10厘米、10-20厘米和20-30厘米）土壤细菌和真菌群落垂直格局及组装的影响。我们的结果表明，短期增温对细菌或真菌群落的α多样性没有显著影响。尽管随着土壤温度升高，下层细菌群落变得更加相似，但不同处理之间细菌群落垂直结构的差异并不显著。相比之下，真菌群落的垂直结构受增温的显著影响。在所有处理中，驱动细菌群落垂直组装的主要生态过程是基于生态位的过程，而土壤碳和养分是主要驱动因素。在对照样地中，真菌群落的垂直结构由基于扩散的过程驱动，而在增温样地中，生态位和扩散过程共同调节真菌群落。在增温处理下，植物生物量与真菌群落的垂直结构显著相关。pH值的变化与细菌群落的组装显著相关，而土壤含水量、微生物量碳/微生物量磷（MBC/MBP）和微生物量氮/微生物量磷（MBN/MBP）与真菌群落的组装显著相关。这些结果表明，土壤细菌和真菌群落的垂直结构和组装对变暖的响应不同，并且可以为高寒泥炭地微生物群落组装对变暖的响应提供潜在机制。
