Slope aspect affects the soil microbial communities in karst tiankeng negative landforms

Jiang, Cong; Zhu, Shidan; Feng, Jun; Shui, Wei

doi:10.1186/s12862-022-01986-y

Cited by 11 publications

(4 citation statements)

References 46 publications

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“…However, the inhibitory effect of VWC on Rs is significantly stronger in thermokarst areas than under natural conditions ( p < 0.05). This difference may be related to the dynamic changes in moisture in thermokarst areas and their impact on soil microbial activity and organic matter decomposition [ 40 ]. Excessive water content can lead to soil anoxia, thereby inhibiting microbial activity and reducing Rs [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake

Mao,

Chen,

et al. 2024

Biology

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As the climate warms, the thickening of the active layer of permafrost has led to permafrost melting and surface collapse, forming thermokarst landforms. These changes significantly impact regional vegetation, soil physicochemical properties, and hydrological processes, thereby exacerbating regional carbon cycling. This study analyzed the relationship between soil respiration rate (Rs), soil temperature (T), and volumetric water content (VWC) in the thermokarst depression zone of the headwater wetlands of Qinghai Lake, revealing their influence on these soil parameters. Results showed a significant positive correlation between soil temperature and Rs (p < 0.001), and a significant negative correlation between VWC and Rs (p < 0.001). The inhibitory effect of VWC on Rs in the thermokarst depression zone was stronger than under natural conditions (p < 0.05). Single-factor models indicated that the temperature-driven model had higher explanatory power for Rs variation in both the thermokarst depression zone (R2 = 0.509) and under natural conditions (R2 = 0.414), while the humidity-driven model had lower explanatory power. Dual-factor models further improved explanatory power, slightly more so in the thermokarst depression zone. This indicates that temperature and humidity jointly drive Rs. Additionally, during the daytime, temperature had a more significant impact on Rs under natural conditions, while increased VWC inhibited Rs. At night, the positive correlation between Rs and temperature in the thermokarst depression zone increased significantly. The temperature sensitivity (Q10) values of Rs were 3.32 and 1.80 for the thermokarst depression zone and natural conditions, respectively, indicating higher sensitivity to temperature changes at night in the thermokarst depression zone. This study highlights the complexity of soil respiration responses to temperature and humidity in the thermokarst depression zone of Qinghai Lake’s headwater wetlands, contributing to understanding carbon cycling in wetland ecosystems and predicting wetland carbon emissions under climate change.

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Section: Discussionmentioning

confidence: 99%

The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake

Mao,

Chen,

et al. 2024

Biology

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“…Both the distribution of samples and the selection of measured environmental variables tend to be informed by the study objectives and hypotheses. Studies focusing on the effects of specific environmental variables may collect the samples alongside these studied variables’ gradients 63 – 66 . If the research objectives are investigating the ecological relationships between soil fungi and other organisms, e.g., selected plants, the samples may be collected from the vicinity of these plants 19 , 22 .…”

Section: Discussionmentioning

confidence: 99%

Landscape-scale mapping of soil fungal distribution: proposing a new NGS-based approach

Janowski

Leski

2023

Sci Rep

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Soil fungi play an indispensable role in the functioning of terrestrial habitats. Most landscape-scale studies of soil fungal diversity try to identify the fungal taxa present at a study site and define the relationships between their abundance and environmental factors. The specific spatial distribution of these fungi over the site, however, is not addressed. Our study’s main objective is to propose a novel approach to landscape-scale mapping of soil fungi distribution using next generation sequencing and geographic information system applications. Furthermore, to test the proposed approach and discuss its performance, we aimed to conduct a case study mapping the spatial distribution of soil fungi on the Wielka Żuława island. The case study was performed on the Wielka Żuława island in northern Poland, where soil samples were collected every 100 m in an even grid. The fungal taxa and their relative abundance in each sample were assessed using the Illumina platform. Using the data obtained for the sampled points, maps of soil fungi spatial distribution were generated using three common interpolators: inverted distance weighted (IDW), B-spline, and ordinary Kriging. The proposed approach succeeded in creating maps of fungal distribution on Wielka Żuława. The most abundant groups of soil fungi were Penicillium on the genus level, Aspergillaceae on the family level, and ectomycorrhizal fungi on the trophic group level. Ordinary Kriging proved to be the most accurate at predicting relative abundance values for the groups of fungi significantly spatially autocorrelated at the sampled scale. For the groups of fungi not displaying spatial autocorrelation at the sampled scale, IDW provided the most accurate predictions of their relative abundance. Although less accurate at predicting exact relative abundance values, B-spline performed best in delineating the spatial patterns of soil fungi distribution. The proposed approach to landscape-scale mapping of soil fungi distribution could provide new insights into the ecology of soil fungi and terrestrial ecosystems in general. Producing maps of predicted fungal distribution in landscape-scale soil fungi diversity studies would also facilitate the reusability and replicability of the results. Outside the area of research, mapping the distribution of soil fungi could prove helpful in areas such as agriculture and forestry, nature conservation, and urban planning.

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“…Furthermore, the similar composition of dominant genera at the fungal family level suggests a stable microbial community composition structure for soil microorganisms from different slope orientations at the same site. However, the highest abundance of species differs between slope orientations, suggesting that microorganisms with specific functions can survive in habitats with different environmental variables (Jiang et al, 2022).…”

Section: Response Of Bacterial Community Diversity and Composition To...mentioning

confidence: 99%

Comparative Study of Soil Microbial Diversity on Different Slope Orientations in Karst Rocky Mountains of Guangxi, China

Zhu,

Liu,

et al. 2023

Tropical Conservation Science

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Background and Research aim: Slope orientations can have a significant impact on the establishment of soil bacterial communities by influencing microclimate, soil properties and hydrological processes such as temperature, water content, pH and soil nutrients. Moreover, soil organic matter in karst ecosystems is more sensitive to environmental changes due to its lower resistance to disturbance. Methods: In this study, we analysed the multiple effects on soil bacterial community structure in karst landscapes at different slope orientations. The chemical properties of the soil of the sunny slope, the shady slope and the hilltop are compared and soil microbial communities are analyzed by high throughput sequencing. Results: We found that soil chemical properties (Total Carbon, Total Nitrogen, Total Phosphorus, Total carbon/Total Nitrogen ratio, Total carbon/Total Phosphorus ratio, Total nitrogen/Total Phosphorus ratio) differed between different slope orientations, but pH didn’t differ significantly. In contrast, areas with high carbon to nitrogen ratios showed lower bacterial abundance. Conclusions: This study uncovered distinct soil chemical properties among soils with different slope orientations. At the bacterial and fungal levels, the sunny slope exhibits the properties of having more ASVs. Moreover, although the soil microbial communities exhibited similar structures across these slope orientations, there were substantial variations in species abundance and microbial characteristics. Notably, the abundance of thermophilic bacterial groups increases significantly with increasing altitude, while the bacterial communities with the highest abundance of tree species at low altitude tend to be mesophilic. This study reveals the differences in soil microbial community structure under the influence of different slope orientations, which has practical implications for the overall understanding of soil microbes in karst landscapes and the influence of slope orientation on soil microbial diversity. Implications for Conservation: This study aims to provide a reference and scientific basis for the conservation of karst microbial diversity.

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Slope aspect affects the soil microbial communities in karst tiankeng negative landforms

Cited by 11 publications

References 46 publications

The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake

The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake

Landscape-scale mapping of soil fungal distribution: proposing a new NGS-based approach

Comparative Study of Soil Microbial Diversity on Different Slope Orientations in Karst Rocky Mountains of Guangxi, China

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