Impact of global urban expansion on the terrestrial vegetation carbon sequestration capacity

Zhuang, Qingwei; Shao, Zhenfeng; Li, Deren; Huang, Xiao; Li, Yuzhen; Altan, Orhan; Wu, Shanshan

doi:10.1016/j.scitotenv.2023.163074

Cited by 30 publications

(7 citation statements)

References 65 publications

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“…Previous research on carbon sequestration has predominantly focused on forests, grasslands, wetlands, and oceans ( Yang et al, 2022 ), often regarding cities as major carbon sources, and overlooking their role as carbon sequestration in urban ecosystems. Vegetation, soil, and water systems in urban areas possess carbon absorption capabilities and are crucial urban carbon sequestration components ( Zhuang et al, 2023 ). As the largest carbon reservoir in terrestrial ecosystems, the soil stores four times more SOC than vegetation.…”

Section: Discussionmentioning

confidence: 99%

Urbanization-induced soil organic carbon loss and microbial-enzymatic drivers: insights from aggregate size classes in Nanchang city, China

Zhang,

Zhong,

Zhao

et al. 2024

Front. Microbiol.

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Soil microorganisms and enzymes play crucial roles in soil organic carbon (SOC) sequestration by promoting soil aggregate formation and stability and by participating in SOC cycling and accumulation. However, the effects by which soil microorganisms and enzymes act as mediators driving dynamic changes in SOC during rapid urbanization remain unclear. Therefore, this study selected the built-up area of Nanchang City, China (505 km2), as the study area. Sampling surveys were conducted using 184 sample plots stratified based on the proportion of impermeable surface area to distinguish different urbanization levels. The driving factors of dynamic changes in SOC of different aggregates during the process of urbanization were analyzed using the soil microbial community and enzyme activities. The results demonstrated that with an increase in urbanization intensity, both SOC content and stock exhibited a significant decline (p < 0.05). The highest SOC stock and contribution rate were observed in the 0.25–1 mm aggregates, and they were significantly influenced by urbanization (p < 0.05). In addition, the biomass of gram-positive bacteria (G+) and actinomycetota, and the activities of N-acetylglucosaminidase and acid phosphatase (AP) were significantly higher in low-urbanization areas than in high-urbanization areas (p < 0.05). SOC of each aggregate was positively correlated with fungi, arbuscular mycorrhizal fungi, G+, gram-negative bacteria, actinomycetota, protozoa, β-1,4-glucosidase, N-acetylglucosaminidase, AP, urease, and catalase. Compared to soil enzymes, soil microorganisms exhibited a greater role in SOC sequestration (22.7%). Additionally, a structural equation model indicated that urbanization can directly or indirectly lead to a decrease in SOC of aggregates by altering soil physicochemical properties and affecting microbial and enzyme dynamics. However, the larger vegetation characteristics index mitigate the negative impacts of urbanization on SOC. Overall, urbanization had a negative impact on soil carbon storage. In the future, it is important to consider strategies that focus on improving soil nutrients, maintaining soil structure, protecting existing urban trees, and enhancing plant diversity during the urbanization process. These measures can help increase soil microbial biomass and enzyme activity, thereby improving soil and aggregate-related SOC content. The study could contribute to enhancing carbon sequestration in urban greenspaces.

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Section: Discussionmentioning

confidence: 99%

Urbanization-induced soil organic carbon loss and microbial-enzymatic drivers: insights from aggregate size classes in Nanchang city, China

Zhang,

Zhong,

Zhao

et al. 2024

Front. Microbiol.

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“…Referring to the "Yunnan Province Forest Resource Planning and Design Survey Operation Rules", the slope was divided into six levels and the aspect was divided into nine directions [45,46]. Using the reclassification tool in ArcGIS, the slope was divided into six categories (in degrees): gentle slope (0-5), mild slope (6)(7)(8)(9)(10)(11)(12)(13)(14)(15), moderate slope (16)(17)(18)(19)(20)(21)(22)(23)(24)(25), steep slope (26)(27)(28)(29)(30)(31)(32)(33)(34)(35), sharp slope (36)(37)(38)(39)(40)(41)(42)(43)(44)(45), and dangerous slope (≥46). The remaining six variables were converted from continuous to categorical using the natural break point classification method (Table 1).…”

Section: Data Preprocessingmentioning

confidence: 99%

“…In response to these issues, scholars have conducted a lot of research on carbon sinks, but they often focus on the impact of a single influencing factor (e.g., vegetation type, building land expansion, etc.) on carbon sinks in economically developed or densely vegetated areas, or are limited to short-term time series studies [36,37]. However, in arid and semi-arid areas, little research combines land-use types, topography, climate, and other natural and human activity factors for long-term time series studies, explores their lag relationships, and analyzes the drivers of the carbon fixation capacity of vegetation.…”

Section: Introductionmentioning

confidence: 99%

The Relationship between the Carbon Fixation Capacity of Vegetation and Cultivated Land Expansion and Its Driving Factors in an Oasis in the Arid Region of Xinjiang, China

Sun,

Jiang,

et al. 2024

Forests

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In the process of agricultural development in arid and semi-arid areas, the carbon fixation capacity of vegetation can be affected to different degrees, but research on its driving factors is lacking. Consequently, this paper focuses on the Weiku Oasis in Xinjiang as its research area, in which the carbon fixation capacity of vegetation is estimated with the chemical equation of a photochemical reaction, using methods such as linear system models and Geodetector to analyze the relationship between cropland expansion characteristics and the carbon fixation capacity of vegetation from 1990 to 2020. The influence of land-use changes on the space differentiation of carbon fixation was elucidated through a time series relationship, and the synergistic effects of nine influencing factors on the carbon fixation capacity during the process of vegetation changes were discussed. The results were as follows: (1) In the process of agricultural development, the proportions of cultivated land area and spatial agglomeration had significant negative correlations with carbon sequestration, and the significance was rising, but the effect of cultivated land area proportion was more significant. (2) Through temporal sequential cooperativity analysis, when other land-use types were converted into cultivated land, the carbon fixation capacity of vegetation suddenly and significantly decreased in the initial year of the transformation, but the effect of cultivated land reclamation on the carbon fixation capacity of vegetation did not have a significant time lag. Moreover, after a certain period of time, cultivated land can gradually recover part of its lost carbon fixation capacity. (3) Among the nine driving factors, potential evapotranspiration is the most prominent in explaining the carbon fixation capacity of vegetation. This single-factor pairwise interaction presents the relationship between bivariate enhancement and nonlinear enhancement. When terrain factors interact with other factors, the enhancement effect of the influence on the carbon fixation capacity of vegetation has an obvious promotion effect. However, the change in the carbon fixation capacity of vegetation is more significantly influenced by potential evapotranspiration and the interaction between the normalized difference vegetation index (NDVI) and other factors. This research is helpful to understanding the basic theories related to the change in the carbon fixation capacity of vegetation during the process of agricultural development in arid and semi-arid areas, as well as providing theoretical reference for ecological environment construction and sustainable development.

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“…But under the SSP5-8.5 climate scenario, the main cause of the loss in carbon stocks is the conversion of grassland and forest to cultivated and construction land. Therefore, land transfers have both positive and negative effects on the sequestration of carbon in watersheds, regional carbon neutrality challenges still exist, optimizing watershed land use patterns, developing scientific land management strategies are important measures to enhance regional carbon stock in the background of global climate change Zhuang et al 2023).…”

Section: Effects Of Land Use Change On the Spatial And Temporal Chara...mentioning

confidence: 99%

Mechanisms for Carbon Stock Driving and Scenario Modeling in Typical Mountainous Watersheds of Northeastern China

Zhang,

Zhang

et al. 2023

Preprint

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Impact of global urban expansion on the terrestrial vegetation carbon sequestration capacity

Cited by 30 publications

References 65 publications

Urbanization-induced soil organic carbon loss and microbial-enzymatic drivers: insights from aggregate size classes in Nanchang city, China

Urbanization-induced soil organic carbon loss and microbial-enzymatic drivers: insights from aggregate size classes in Nanchang city, China

The Relationship between the Carbon Fixation Capacity of Vegetation and Cultivated Land Expansion and Its Driving Factors in an Oasis in the Arid Region of Xinjiang, China

Mechanisms for Carbon Stock Driving and Scenario Modeling in Typical Mountainous Watersheds of Northeastern China

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