Base on Model Experiment to Study the Effects of Vertical Space on the Temperature of Soil Microhabitats in the Process of Karst Rock Desertification

Liu, Yan

doi:10.15666/aeer/1706_1560515614

Cited by 2 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…Enzyme C:N ratios and vector lengths were highest in SS and lowest in RG and RS, while vector angles were the opposite, suggesting weaker nitrogen limitation in SS compared to RG and RS. The reason may be that the exposed bedrock in RG and RS causes greater temperature fluctuations ( Yan et al., 2019 ), inhibiting microbial activity and reducing nitrogen mineralization. During the experimental design phase, we selected sampling points from three distinct regions while maintaining similar forest vegetation types within each region.…”

Section: Discussionmentioning

confidence: 99%

Unraveling plant adaptation to nitrogen limitation from enzyme stoichiometry aspect in Karst soils: a case study of Rhododendron Pudingense

Wang,

Huang,

Zhao

et al. 2023

Front. Plant Sci.

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Enzyme stoichiometry can reflect the resource limitation of soil microbial metabolism, and research on the relationships between plants and resource limitation in Karst Microhabitats is scarcely investigated. To clarify the extracellular enzyme stoichiometry characteristics in soil across different karst microhabitats and how the Rhododendron pudingense adapts to nutrient restrictions, plot investigation experiments were set up in Zhenning County, Qinglong County, and Wangmo County of Guizhou Province which included total three karst microhabitats, i.e., soil surface (SS), rock gully (RG), and rock surface (RS), by analyzing he rhizosphere soil nutrient, extracellular enzyme activity, and nutrient content of R. pudingense. The findings indicated that all karst microenvironments experienced varying levels of nitrogen (N) limitation, with the order of N limitation being as follows: SS > RG > RS. Notably, there were significant discrepancies in N content among different plant organs (p< 0.05), with the sequence of N content as follows: leaf > stem > root. However, no significant differences were observed in nutrient content within the same organ across different microenvironments (p > 0.05). A noteworthy discovery was the significant allometric growth relationship between C-P in various organs (p< 0.05), while roots and stems exhibited a significant allometric growth relationship between N-P (p< 0.05). The study highlighted the substantial impact of Total Nitrogen (TN) and N-acquiring enzymes (NAE) on nutrient allocation within the components of R. pudingense. Overall, the research demonstrated that N was the primary limiting factor in the study area’s soil, and R. pudingense’s nutrient allocation strategy was closely associated with N limitations in the karst microenvironment. Specifically, the plant prioritized allocating its limited N resources to its leaves, ensuring its survival. This investigation provided valuable insights into how plants adapt to nutrient restrictions and offered a deeper understanding of soil-plant interactions in karst ecosystems.

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Section: Discussionmentioning

confidence: 99%

Unraveling plant adaptation to nitrogen limitation from enzyme stoichiometry aspect in Karst soils: a case study of Rhododendron Pudingense

Wang,

Huang,

Zhao

et al. 2023

Front. Plant Sci.

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“…It may be that SS has better soil texture and can better preserve nutrients and water [15,48], and the rapid change in water in RG and RS causes certain physiological pressure on microorganisms [49]. At the same time, the bare bedrock causes large temperature fluctuations in RG and RS [17], and the microclimate is different [20]. In order to adapt to this feature, the microbial species composition is different from that in SS.…”

Section: Effects Of Habitat Heterogeneity On Rhizosphere Soil Microbi...mentioning

confidence: 99%

“…According to the origin and external morphological characteristics of the habitat, six microhabitats, such as rock gully, rock surface, rock trough, soil surface, rock seam and rock cave, could be classified [16]. Previous studies have shown that there are differences in soil physical and chemical properties and microclimate characteristics in karst microhabitats, which are mainly manifested in soil nutrient content, temperature, humidity and light intensity [17][18][19][20]. The community structure and function of soil microorganisms are closely related to the soil environment [21], and differences in soil environment will also affect the energy flow and nutrient cycle closely related to microbial activities in the ecosystem [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Karst Microhabitats on the Structure and Function of the Rhizosphere Soil Microbial Community of Rhododendron pudingense

et al. 2023

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Soil microbes play an important role in the microbial circulation and energy flow of ecosystems. In order to understand the change in the rhizosphere soil microbial community structure and function in the heterogeneous karst habitats, the nutrient content and enzyme activity were analyzed, and Illumina MiSeq high-throughput sequencing technology was used to detect the composition, quantity and functional types of the rhizosphere soil microbial community in Rhododendron pudingense under three kinds of karst microhabitats (soil surface, rock gully and rock surface) in Wangmo Country (WM), Zhenning Country (ZN) and Qinglong Country (QL). The results showed that SS and RG microhabitats had a higher nutrient content and enzyme activity, while RS had the lowest. At the phylum level, Proteobacteria and Actinomycetes were dominant in terms of bacteria, while Ascomycota and Basidiomycotina were dominant in terms of fungi. There was no significant difference in microbial diversity among different karst microhabitats (p > 0.05). At the microbial genus level, there were some differences in species composition among the three karst microhabitats, which may lead to soil heterogeneity in karst microhabitats. WM was a little different from ZN and QL. The results of PCoA showed that the community composition of RG and RS was more similar to that of SS. There was no significant difference in microbial functional types among different microhabitats (p > 0.05). Only the abundance of pathothoph-symbiothoph fungi in RG was significantly higher than that in RS (p < 0.05). The main function of bacteria was metabolism, and saprophytic and symbiotic fungi were the dominant fungal group. In conclusion, soil organic carbon and alkaline phosphatase are important factors affecting the level distribution of microflora in different karst microhabitats. R. pudingense in the SS and RG microhabitats has better soil conditions, which may require protection for the plants in the RS microhabitat. The current study results can provide a theoretical basis for the adaptation mechanism of Rhododendron pudingense to the karst microhabitat.

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Base on Model Experiment to Study the Effects of Vertical Space on the Temperature of Soil Microhabitats in the Process of Karst Rock Desertification

Abstract: Yan et al.: Base on model experiment to study the effects of vertical space on the temperature of soil microhabitats in the process of karst rock desertification -15605 -

Cited by 2 publications

References 3 publications

Unraveling plant adaptation to nitrogen limitation from enzyme stoichiometry aspect in Karst soils: a case study of Rhododendron Pudingense

Unraveling plant adaptation to nitrogen limitation from enzyme stoichiometry aspect in Karst soils: a case study of Rhododendron Pudingense

Effect of Karst Microhabitats on the Structure and Function of the Rhizosphere Soil Microbial Community of Rhododendron pudingense

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