Tree species mixture effect on extracellular enzyme kinetics varies with enzyme type and soil depth in subtropical plantations

Jiang, Xue-Li; Mao, Rong; Li, Zhong-Liang; Chen, Fu-Sheng; Xu, Bin; He, Jin; Huang, Yu-Xin; Fang, Xiang-Min

doi:10.1007/s11104-023-06229-7

Cited by 2 publications

(1 citation statement)

References 52 publications

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“…In each plot, 10-15 soil cores were randomly collected at a depth of 0-40 cm, employing a specialized sterile soil corer. We divided each soil core into two groups: topsoil at 0-20 cm and subsoil at 20-40 cm depth based on the fact that most cereal and tree fine root density declined rapidly in the soil profile with few fine roots presented below 50 cm depth (Jiang, Mao, et al, 2023;Jones et al, 2018). Within each site, a composite soil sample was constructed by mixing soil samples at the same soil depth from three plots under each land-use type.…”

Section: Site Description Experimental Design and Samplingmentioning

confidence: 99%

Labile carbon content and nutrient availability determines microbial composition in topsoil and subsoil following land‐use change in subtropical China

Xiao,

Sheng,

Zhang

et al. 2024

Land Degrad Dev

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Evaluating the impact of land‐use intensification on soil microbial communities is essential for recognizing the implications on microbiome stability and ecosystem function. The microbial biomass and enzyme activity in the topsoil have been found to decrease as a consequence of natural forest conversion; however, the impact of land‐use conversion on the microbes in subsoil remains largely unclear. Here, we examined the effect of primary forest conversion to plantations and cultivated lands on microbial communities at three sites with similar soil, climate, and landform. The forest conversion was set as the experimental treatment, and the primary forest as the control. A linear mixed‐effect model was applied to investigate the role of environmental parameters in shaping the soil microbial biomass and community determined by the phospholipid fatty acids analysis in both the topsoil (0–20 cm) and subsoil (20–40 cm). Compared to the primary forest, the total microbial biomass, β‐1,4‐N‐acetylglucosaminidase, leucine aminopeptidase, acid phosphatase activities, and labile organic C fraction contents in both topsoil and subsoil were reduced in cultivated lands. The ratios of gram‐positive bacteria to gram‐negative bacteria and arbuscular mycorrhizal fungi to saprotrophic fungi in subsoil decreased by 45%–53% and increased by 29%–151%, respectively, following the primary forest conversion to cultivated lands. The response ratio (the percentage of microbial and enzyme indicator response to the primary forest conversion) ranged from −80% to 140% depending on the soil depth, specific microbial group, and converted land‐use type. Microbial biomass and enzyme activity are primarily controlled by the labile organic C content and nutrients availability in both topsoil and subsoil. This study suggests that the primary forest conversion exerts an adverse effect on the microbial biomass, enzyme activity, and substrate availability in both topsoil and subsoil, highlighting the degradation of subsoil health in subtropical China.

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Section: Site Description Experimental Design and Samplingmentioning

confidence: 99%

Labile carbon content and nutrient availability determines microbial composition in topsoil and subsoil following land‐use change in subtropical China

Xiao,

Sheng,

Zhang

et al. 2024

Land Degrad Dev

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Deep soil organic carbon: A review

Dubeux,,

Lira Junior,

Simili

et al. 2024

CABI Reviews

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Soil organic carbon (SOC) sequestration promotes several ecological, economic, and social co-benefits. However, most SOC studies rely on topsoil evaluations (0–30 cm), disregarding a significant fraction of the SOC that is stored in deep layers. Understanding the relationship between deep soil carbon and climate change is imperative in guiding sustainable land management practices, informing climate change mitigation strategies, and preserving the crucial role of deep soil carbon in regulating atmospheric CO 2 levels. We conducted a comprehensive literature review to discuss the origins of deep soil carbon, the globally standardized methodology recommended for measuring SOC stocks, the mechanisms controlling SOC sequestration (physical, chemical, and biochemical) in deep layers, the significance of microbial community in deep soil layers, advancements in radiocarbon studies, the impact of management practices on deep SOC, and the influence of climate change on deep SOC stocks. Overall, more empirical data and long-term studies are needed to address the knowledge gaps in terms of deep SOC and advance our understanding of the role of deep soil carbon in shaping global carbon cycles and climate resilience. The main challenges for accurate SOC estimations and global carbon budgets are the high spatial variability, the relative lack of deep soil measurements, and the need for reliable reference data for modeling improvements. A practical and accurate soil bulk density (BD) estimation in deep layers (i.e., 30–100 cm) is crucial to improve the accuracy of global C stock estimations and should be addressed in further studies. Modeling approaches based on sensors and machine learning techniques are promising tools to overcome this challenge. However, there is still a large variability in methods to measure and report soil BD and SOC stocks worldwide, preventing further advances.

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Tree species mixture effect on extracellular enzyme kinetics varies with enzyme type and soil depth in subtropical plantations

Cited by 2 publications

References 52 publications

Labile carbon content and nutrient availability determines microbial composition in topsoil and subsoil following land‐use change in subtropical China

Labile carbon content and nutrient availability determines microbial composition in topsoil and subsoil following land‐use change in subtropical China

Deep soil organic carbon: A review

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