Effects of simulated warming and decomposition interface on the litter decomposition rate of Zizania latifolia and its phyllospheric microbial community structure and function
Peng-Fei YAN1, Peng-Fei ZHAN1, De-Rong XIAO1, Yi WANG2, Rui YU1, Zhen-Ya LIU1, Hang WANG,1,*1 Southwest Forestry University National Plateau Wetlands Research Center/Wetlands College, Kunming 650224, China 2 College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
Supported by the National Natural Science Foundation of China(41877346) Supported by the National Natural Science Foundation of China(31500409) Supported by the National Natural Science Foundation of China(41867059)
Abstract Aims Litters of emergent plants are important components of material cycling in wetland ecosystems. To clarify the effects of climate warming and habitat difference on the litter decomposition processes and phyllospheric microorganisms of wetland emergent plants is of great significance for revealing the key material cycling processes in wetland ecosystems. MethodsZizania latifolia, a dominant emergent plant in typical wetlands of Northwestern Yunnan Plateau, was chosen for this study. Using litter bag methods, we studied mass remaining and the abundance, community structure and metabolic potential of phyllospheric microorganisms of the litter from Zizania latifolia under simulated warming (1.5-2.0 ℃) and under three habitats (air, water and soil interface). Important findings Simulated climatic warming and habitat difference significantly affected the litter decomposition rate. After one-year decomposition, the mass remaining of litter was 66.4% under the simulated warming treatment, while 77.7% under the control treatment. The decomposition constant (k) value was 1.64 times under warming compared to the control. The mass remaining of litter at the water and soil interface was 42.2% and 25.3%, and the k value at the water and soil interface was 3.63 and 5.25 times of that at the air interface respectively. These results indicate that habitat difference was the key factor controlling the decomposition of emergent plant litter in wetlands. Moreover, warming mainly changed the community composition of litter phyllospheric microorganisms, while decomposition interface mainly affected the abundance, community structure and metabolic potential of phyllospheric microorganisms. Notably, phyllospheric microorganisms of litter at soil interface had the highest metabolic potential and utilized alcohols as main carbon sources. The characteristics of phyllospheric microorganisms between different treatments were in good agreement with litter decomposition rate, which provides an important theoretical basis for revealing the microbial mechanisms driving the decomposition of wetland plant litter. Keywords：wetland ecosystem;litter decomposition;phyllospheric microorganisms;simulated warming;habitat difference
PDF (4044KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 引用本文 闫鹏飞, 展鹏飞, 肖德荣, 王燚, 余瑞, 刘振亚, 王行. 模拟增温及分解界面对茭草凋落物分解速率及叶际微生物结构和功能的影响. 植物生态学报, 2019, 43(2): 107-118. DOI: 10.17521/cjpe.2018.0272 YAN Peng-Fei, ZHAN Peng-Fei, XIAO De-Rong, WANG Yi, YU Rui, LIU Zhen-Ya, WANG Hang. Effects of simulated warming and decomposition interface on the litter decomposition rate of Zizania latifolia and its phyllospheric microbial community structure and function. Chinese Journal of Plant Ecology, 2019, 43(2): 107-118. DOI: 10.17521/cjpe.2018.0272
Fig. 1Experiment of simulated warming and habitat difference for litter decomposition of Zizania latifolia. A, Three habitats include air interface, water interface, and soil interface. Among them, litter bags under air decomposition were hang over the bamboo (1.2 m from the ground), litter bags under water decomposition were floated in the surface of water (with the aids of table tennis), and litter bags under soil decomposition were fixed by PVC tubes in the soils (5.0 cm in deep). B, The design and operation of Open-top Chamber (OTC). Among them, control group has no OTC devices, and OTC devices simulate rising temperature (warming group). The device was constructed by solar panels with 2.4 m base and 2.0 m opening in diameter. The temperatures between control and warming groups were recorded from December 2014 to December 2015 (once per hour). In warming treatment, the temperature has been raised by 1.5-2.0 ℃. C, The research object was a typical emergent wetland plant, Zizania latifolia. Its leaf litter was subjected to warming and habitat difference treatments.
新窗口打开|下载原图ZIP|生成PPT 图2茭草叶凋落物质量残留率的季节性动态(平均值±标准误差, n = 3)。利用Post Hoc Tests进行两两比较分析, 不同小写字母代表处理之间的差异达到显著水平(p < 0.05)。
Fig. 2Seasonal dynamics in mass remaining of leaf litter from Zizania latifolia (mean ± SE, n = 3). The different lowercase letters above error bars indicate significant differences between treatments by Post Hoc Tests (p < 0.05).
新窗口打开|下载原图ZIP|生成PPT 图4茭草凋落物叶际细菌群落多样性指数(Chao1)及细菌在属分类水平上的群落结构特征。图中误差线为标准误差(n = 3), 利用Post Hoc Tests进行两两比较分析, 不同小写字母代表处理之间的差异达到显著水平(p < 0.05)。
Fig. 4Diversity of bacterial community indicated by Chao1 index and the bacterial community composition at the genus level for leaf litter of Zizania latifolia. The error bars represent standard errors (n = 3), and the different lowercase letters above error bars indicate significant differences between treatments by Post Hoc Tests (p < 0.05).
Fig. 5Dynamics in average well color development (AWCD) value for carbon sources utilized by litter phyllospheric microorganisms of Zizania latifolia during an incubation period of 12-168 h. The error bars represent standard errors (n = 3), and the different lowercase letters above error bars indicate significant differences between treatments by Post Hoc Tests (p < 0.05).
Fig. 7Similarity analysis shows the contribution of different carbon sources to the dissimilarity between control vs. warming, air interface vs. water interface, air interface vs. soil interface, and water interface vs. soil interface, illustrated by heatmaps. The color (blue to red) represents the relative contribution of different carbon substrates (0-100%). The observations at 72-96 h incubation point were used for drawing the heatmaps.
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ChristofferB, MireiaBF, JaroneP, CatherineL ( 2018). Response of microbial communities to changing climate conditions during summer cyanobacterial blooms in the Baltic Sea Frontiers in Microbiology, 9, 1562. DOI: 10.3389/ fmicb.2018.01562. DOI:10.3389/fmicb.2018.01562URL [本文引用: 1] Frequencies and biomass of Baltic Sea cyanobacterial blooms are expected to be higher in future climate conditions, but also of longer duration as a result of increased sea surface temperature. Concurrently, climate predictions indicate a reduced salinity in the Baltic Sea. These climate-driven changes are expected to alter not solely the phytoplankton community but also the role of microbial communities for nutrient remineralization. Here, we present the response of summer plankton communities (filamentous cyanobacteria, picocyanobacteria, and heterotrophic bacteria) to the interplay of increasing temperature (from 16 to 18°C and 20°C) and reduced salinity (from salinity 6.9 to 5.9) in the Baltic Proper (NW Gotland Sea) using a microcosm approach. Warmer temperatures led to an earlier peak of cyanobacterial biomass, while yields were reduced. These conditions caused a decrease of nitrogen-fixers (Dolichospermum sp.) biomass, while non nitrogen-fixers (Pseudanabaena sp.) increased. Salinity reduction did not affect cyanobacterial growth nor community composition. Among heterotrophic bacteria, Actinobacteria showed preference for high temperature, while Gammaproteobacteria thrived at in situ temperature. Heterotrophic bacteria community changed drastically at lower salinity and resembled communities at high temperature. Picocyanobacteria and heterotrophic bacterial biomass had a pronounced increase associated with the decay of filamentous cyanobacteria. This suggests that shifts in community composition of heterotrophic bacteria are influenced both directly by abiotic factors (temperature and salinity) and potentially indirectly by cyanobacteria. Our findings suggest that at warmer temperature, lower yield of photosynthetic cyanobacteria combined with lower proportion of nitrogen-fixers in the community could result in lower carbon export to the marine food web with consequences for the decomposer community of heterotrophic bacteria.
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FerreiraV, RaposeiroPM, PereiraA, CruzAM, CostaAC, GracaM, GoncalvesV ( 2016). Leaf litter decomposition in remote oceanic island streams is driven by microbes and depends on litter quality and environmental conditions Freshwater Biology, 61, 783-799. DOI:10.1111/fwb.12749URL [本文引用: 1] 1. Leaf litter decomposition is an important process in many streams. The flow of carbon and nutrients to higher trophic levels generally depends on litter characteristics and environmental conditions, and is driven by the activities of microbes and invertebrate shredders. However, little is known about what drives litter decomposition in oceanic islands, where invertebrate communities are species-poor. 2. In this study we assessed the relative importance of litter quality and environmental conditions on the biological colonization and decomposition of litter exposed to and protected from macroinvertebrates, in the Azores archipelago, North Atlantic Ocean. Three leaf litter species with distinct physical and chemical characteristics (Acacia melanoxylon, Clethra arborea and Pittosporum undulatum) were incubated in six streams with distinct water characteristics. Coarse and fine mesh bags were used to isolate the relative role of macroinvertebrates on litter decomposition. Incubation of litter took place in late spring – early summer and lasted for up to 56 days. 3. No significant differences in litter decomposition rates were found between coarse and fine mesh bags suggesting that microbes, especially aquatic hyphomycetes, are the key players in litter decomposition in these island streams. 4. Litter decomposition rates were inversely proportional to initial lignin concentration: A. melanoxylon 0.0080 d–1, C. arborea 0.0121 d–1, P. undulatum 0.0292 d–1, on average across streams. 5. Litter decomposition rates and associated decomposers differed among streams, suggesting that environmental conditions (e.g. nutrient concentration) may be important moderators of biological activities in these streams, as found for continental streams. 6. Species richness, fungal biomass and reproductive activity of aquatic hyphomycetes on decomposing litter were recorded in Atlantic islands for the first time and were at levels similar to those found for continental streams. 7. High microbial activities in Atlantic island streams ensure litter decomposition when detritivore abundance is low.
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... 生境差异对凋落物的分解产生重要影响(Liu et al., 2015).有研究对比了溪流、河岸带以及林地三种区域生境下凋落物的分解特征, 发现溪流生境条件下凋落物中木质素残留质量最低(岳楷等, 2016); 而在干旱少雨地区, 处于立枯及掩埋状态的凋落物比地表的凋落物分解更快(Liu et al., 2015), 表明生境中的不同环境要素可深刻影响凋落物分解过程.不同于地形、坡度、朝向以及土壤水分等环境因素调控陆生植物凋落物分解过程, 对于湿地挺水植物而言, 其所存在的生境主要包括立枯阶段的大气生境、倒伏阶段的水生境和沉水阶段的土生境, 因此湿地挺水植物凋落物的分解速率主要由处于不同分解阶段的水文环境因素调控.在大气界面, 受水分条件限制, 同时缺乏大型底栖动物活动及冻融作用对凋落物的物理破碎过程, 导致凋落物分解速率较低.与大气界面相比, 水、土界面温暖而湿润的环境因素更有利于凋落物中酸不溶性组分等难分解的高分子结构体的快速降解(Wu et al., 2010), 并且土壤中含有大量的微生物, 通过与凋落物直接接触, 其对底物的利用效率比大气界面更高(Hobara et al., 2014).另外, 我们发现每到秋冬季节, 滇西北区域水路交错地带有明显的冻融现象, 冻结作用也可以直接破坏凋落物的物理结构从而加快处于水、土界面凋落物的分解速率(Ni et al., 2017).可见, 由这些生境所引起的环境因子差异是影响凋落物分解的关键(Parker et al., 2018). ...
... ); 而在干旱少雨地区, 处于立枯及掩埋状态的凋落物比地表的凋落物分解更快(Liu et al., 2015), 表明生境中的不同环境要素可深刻影响凋落物分解过程.不同于地形、坡度、朝向以及土壤水分等环境因素调控陆生植物凋落物分解过程, 对于湿地挺水植物而言, 其所存在的生境主要包括立枯阶段的大气生境、倒伏阶段的水生境和沉水阶段的土生境, 因此湿地挺水植物凋落物的分解速率主要由处于不同分解阶段的水文环境因素调控.在大气界面, 受水分条件限制, 同时缺乏大型底栖动物活动及冻融作用对凋落物的物理破碎过程, 导致凋落物分解速率较低.与大气界面相比, 水、土界面温暖而湿润的环境因素更有利于凋落物中酸不溶性组分等难分解的高分子结构体的快速降解(Wu et al., 2010), 并且土壤中含有大量的微生物, 通过与凋落物直接接触, 其对底物的利用效率比大气界面更高(Hobara et al., 2014).另外, 我们发现每到秋冬季节, 滇西北区域水路交错地带有明显的冻融现象, 冻结作用也可以直接破坏凋落物的物理结构从而加快处于水、土界面凋落物的分解速率(Ni et al., 2017).可见, 由这些生境所引起的环境因子差异是影响凋落物分解的关键(Parker et al., 2018). ...
凋落物分解过程中土壤微生物群落的变化 2 2016
... 生境差异对凋落物的分解产生重要影响(Liu et al., 2015).有研究对比了溪流、河岸带以及林地三种区域生境下凋落物的分解特征, 发现溪流生境条件下凋落物中木质素残留质量最低(岳楷等, 2016); 而在干旱少雨地区, 处于立枯及掩埋状态的凋落物比地表的凋落物分解更快(Liu et al., 2015), 表明生境中的不同环境要素可深刻影响凋落物分解过程.不同于地形、坡度、朝向以及土壤水分等环境因素调控陆生植物凋落物分解过程, 对于湿地挺水植物而言, 其所存在的生境主要包括立枯阶段的大气生境、倒伏阶段的水生境和沉水阶段的土生境, 因此湿地挺水植物凋落物的分解速率主要由处于不同分解阶段的水文环境因素调控.在大气界面, 受水分条件限制, 同时缺乏大型底栖动物活动及冻融作用对凋落物的物理破碎过程, 导致凋落物分解速率较低.与大气界面相比, 水、土界面温暖而湿润的环境因素更有利于凋落物中酸不溶性组分等难分解的高分子结构体的快速降解(Wu et al., 2010), 并且土壤中含有大量的微生物, 通过与凋落物直接接触, 其对底物的利用效率比大气界面更高(Hobara et al., 2014).另外, 我们发现每到秋冬季节, 滇西北区域水路交错地带有明显的冻融现象, 冻结作用也可以直接破坏凋落物的物理结构从而加快处于水、土界面凋落物的分解速率(Ni et al., 2017).可见, 由这些生境所引起的环境因子差异是影响凋落物分解的关键(Parker et al., 2018). ...
... ); 而在干旱少雨地区, 处于立枯及掩埋状态的凋落物比地表的凋落物分解更快(Liu et al., 2015), 表明生境中的不同环境要素可深刻影响凋落物分解过程.不同于地形、坡度、朝向以及土壤水分等环境因素调控陆生植物凋落物分解过程, 对于湿地挺水植物而言, 其所存在的生境主要包括立枯阶段的大气生境、倒伏阶段的水生境和沉水阶段的土生境, 因此湿地挺水植物凋落物的分解速率主要由处于不同分解阶段的水文环境因素调控.在大气界面, 受水分条件限制, 同时缺乏大型底栖动物活动及冻融作用对凋落物的物理破碎过程, 导致凋落物分解速率较低.与大气界面相比, 水、土界面温暖而湿润的环境因素更有利于凋落物中酸不溶性组分等难分解的高分子结构体的快速降解(Wu et al., 2010), 并且土壤中含有大量的微生物, 通过与凋落物直接接触, 其对底物的利用效率比大气界面更高(Hobara et al., 2014).另外, 我们发现每到秋冬季节, 滇西北区域水路交错地带有明显的冻融现象, 冻结作用也可以直接破坏凋落物的物理结构从而加快处于水、土界面凋落物的分解速率(Ni et al., 2017).可见, 由这些生境所引起的环境因子差异是影响凋落物分解的关键(Parker et al., 2018). ...
Decomposition of 51 semidesert species from wide-ranging phylogeny is faster in standing and sand-buried than in surface leaf litters: Implications for carbon and nutrient dynamics 1 2015
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