Decoupling between carbon source and sink induced by responses of daily stem growth to water availability in subtropical urban forests

Zheng, Ji; Sun, Ning; Jin, Yan; Liu, Chunjiang; Yin, Shi

doi:10.1016/j.scitotenv.2023.162802

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…Urbanization not only intensifies the Urban Heat Island effect but also induces the phenomenon known as the Urban Dry Island (Huang et al, 2022). Such persistent moisture deficiencies within cities amplify environmental stress risks for urban vegetation, subsequently affecting carbon cycling processes (Zheng et al, 2023). A study showed that in 65 cities across 56 nations, 64 and 78% of species currently exceed their geographical limits concerning temperature and precipitation conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Comprehending the carbon dynamics of urban forests assumes significance in evaluating their potential as a tool for climate change mitigation and assessing their impact on human health and well-being (Wang et al, 2013;Pregitzer et al, 2022). The carbon dynamics within urban forests are subject to the influence of diverse factors, including tree species composition (Esperon-Rodriguez et al, 2023), environmental conditions (Liu et al, 2023;Zheng et al, 2023), and the impact of urbanization (Bae and Ryu, 2021;Zhang et al, 2022). Hightemporal-resolution data on urban forest carbon dynamics offers multiple benefits.…”

Section: Introductionmentioning

confidence: 99%

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Intra-annual carbon fluxes and resource use efficiency of subtropical urban forests: insights from Chongming Island ecological observatory

Zheng,

Han,

Sun

et al. 2023

Front. For. Glob. Change

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Understanding the carbon budget within cities is crucial in the context of carbon peaking and carbon neutrality. This study investigates the carbon source-sink dynamics of urban forest ecosystems using carbon flux observations from the Chongming Island Ecological Observatory in Shanghai. The study aims to reveal the intra-annual variations of carbon fluxes and explore the changes in resource use efficiency of urban forest ecosystems within the framework of the big-leaf model. The results reveal distinct patterns in temperature (Tair), relative humidity (RH), radiation, and vapor pressure deficit (VPD). Diurnal cycles of net ecosystem exchange (NEE), gross primary production (GPP), and ecosystem respiration (Reco) exhibit seasonal variations, with higher amplitudes observed from April to September. The observed forest ecosystem acts as a moderate carbon sink (318.47 gC m−2 year−1), with the highest carbon uptake occurring in May and the highest carbon emission in February. During the growing season, the total carbon sink was 225.37 gC m−2, composed of GPP 1337.01 gC m−2 and Reco 1111.64 gC m−2. Water-use efficiency (WUE) and light-use efficiency (LUE) exhibit seasonal variations, while carbon-use efficiency (CUE) declines after May. These findings contribute to our understanding of urban forest carbon dynamics and their potential role in carbon management strategies.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intra-annual carbon fluxes and resource use efficiency of subtropical urban forests: insights from Chongming Island ecological observatory

Zheng,

Han,

Sun

et al. 2023

Front. For. Glob. Change

Self Cite

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“…These daily reanalysis data were averaged using two 12-hour datasets in a day and resampled to 30 m using bilinear interpolation. Furthermore, daily vapor pressure deficit (VPD) was calculated using processed Ta and DP [43].…”

Section: Meteorological Datamentioning

confidence: 99%

Quantitative Assessment of Factors Influencing the Spatiotemporal Variation in Carbon Dioxide Fluxes Simulated by Multi-Source Remote Sensing Data in Tropical Vegetation

Xu,

Zhang,

Wang

et al. 2023

Remote Sensing

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Vegetation plays a vital role in the global carbon cycle, a function of particular significance in regulating carbon dioxide fluxes within tropical ecosystems. Therefore, it is crucial to enhance the precision of carbon dioxide flux estimates for tropical vegetation and to explore the determinants influencing carbon sequestration. In this study, Landsat series images and Sentinel-2 Multispectral Instrument satellite data were used to invert vegetation biophysical parameters, thereby improving the timeliness and resolution of state variables from the boreal ecosystem productivity simulator (BEPS). The BEPS model at a 30 m resolution was developed to accurately capture tropical vegetation carbon dioxide fluxes across Hainan Island (HN) over the preceding two decades. The impacts of climate variations and anthropogenic activities on the carbon dioxide fluxes of tropical vegetation were further quantified using quantile regression models and a land-use transfer matrix. Results indicate significant increases in both net primary productivity (NPP) and net ecosystem productivity (NEP) in HN during the period 2000–2020, by 5.81 and 4.29 g C/m2 year, respectively. Spatial trends in vegetation carbon dioxide fluxes exhibited a consistent decline from inland regions to coastal zones. Anthropogenic activities were the dominant factor in the reduced stability of coastal NPP, while the post-2005 vegetation restoration promoted the southward expansion of high NPP (>1200 g C/m2) in the central part of HN. NPP in this tropical island was more sensitive to temperature than to precipitation, with a 1 °C temperature increase resulting in 4.1 g C/m2 reduction in dry-season NPP compared to wet-season NPP. Upgrades of cropland quality and grassland restoration have improved NPP yields, and land use transfers have resulted in a 0.301 Tg C net increase in NPP. This study provides new insight into the improvement of the carbon dioxide flux model at a finer scale for tropical vegetation and highlights ecological construction as an adaptation strategy to enhance the carbon sinks of tropical vegetation under negative climate change conditions.

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“…For instance, studies on the Cinnamomum camphora and Taxodium distichum var. imbricatum trees, conducted in Shanghai (Southeast China) employing high-resolution dendrometers, indicate that the Vapour Pressure Deficit (VPD) is the most significant factor throughout the growth season (Zheng et al, 2023). In contrast, studies on Melia azedarach employing electronic point dendrometers in Xishuangbanna (Southwest China) have demonstrated a significant positive correlation between radial growth and precipitation, average temperature, and minimum temperature, exhibiting the highest correlation with precipitation (Hu & Fan, 2016).…”

Section: Introductionmentioning

confidence: 99%

Intra‐annual radial growth of Quercus acutissma and its response to hydrometeorological factors in the Nandadish experimental catchment, eastern China

Liu,

Liao,

et al. 2024

Hydrological Processes

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Investigating the relationship between tree growth within a year and environmental factors is crucial for understanding how climate change affects seasonal tree growth patterns. In this study, high‐resolution point dendrometers were used to monitor the stem radial changes of Oak trees (Quercus acutissma) over two years (2020 and 2021) in the eastern subtropical monsoon region of China. We find that the main growth period of Oak trees spans from March to September, and air temperature significantly affects the growth onset of Oak trees but with no clear impact on their growth cessation. The observations show that precipitation substantially affects daily stem radial increment (SRI), but the frequency of precipitation days plays a more crucial role in enhancing seasonal growth than the total precipitation amount. In the growing season, the stem radius of the Oak trees shows obvious diurnal cycles with shrinkage during the day and expansion at night, reflecting a delicate balance between canopy water loss and soil water absorption. The diurnal variations of the stem radius during the cold period (January and December) show an opposite pattern to that of the growing season, due to the sap's freezing under the condition of low air temperature at night as well as no or weak transpiration in the daytime. Because the temporal dynamics and intensity of tree activities significantly affect the timing and mechanisms of carbon assimilation in terrestrial ecosystems, our results are helpful to evaluate the carbon sequestration capacity of subtropical forests under the global climate change.

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Decoupling between carbon source and sink induced by responses of daily stem growth to water availability in subtropical urban forests

Cited by 7 publications

References 46 publications

Intra-annual carbon fluxes and resource use efficiency of subtropical urban forests: insights from Chongming Island ecological observatory

Intra-annual carbon fluxes and resource use efficiency of subtropical urban forests: insights from Chongming Island ecological observatory

Quantitative Assessment of Factors Influencing the Spatiotemporal Variation in Carbon Dioxide Fluxes Simulated by Multi-Source Remote Sensing Data in Tropical Vegetation

Intra‐annual radial growth of Quercus acutissma and its response to hydrometeorological factors in the Nandadish experimental catchment, eastern China

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