Spatial patterns and climate controls of seasonal variations in carbon fluxes in China's terrestrial ecosystems

Han, Lang; Wang, Qiufeng; Chen, Zhi; Yu, Guirui; Zhou, Guangsheng; Chen, Shiping; Li, Yingnian; Zhang, Yiping; Yan, Junhua; Wang, Huimin; Han, Shijie; Wang, Yanfen; Sha, Liqing; Shi, Peili; Zhang, Yang‐Jian; Xiang, Wenhua; Zhao, Liang; Zhang, Qiuliang; He, Qihua; Mo, Xingguo; Guo, Jixun

doi:10.1016/j.gloplacha.2020.103175

Cited by 22 publications

(10 citation statements)

References 45 publications

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“…The diurnal variation of NEE generally shows different patterns and magnitudes due to the diversity of vegetation types, climate conditions and underlying surface conditions ( Vitale et al, 2007 ; Han et al, 2020 ; Zhu et al, 2020 ; D’Angelo et al, 2021 ). For example, a significant bimodal diurnal variation was observed in the coastal zone, where nearshore water served as an atmospheric CO 2 sink throughout the day ( Chien et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

et al. 2022

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Peatlands are characterized by their large carbon storage capacity and play an essential role in the global carbon cycle. However, the future of the carbon stored in peatland ecosystems under a changing climate remains unclear. In this study, based on the eddy covariance technique, we investigated the net ecosystem CO2 exchange (NEE) and its controlling factors of the Hongyuan peatland, which is a part of the Ruoergai peatland on the eastern Qinghai-Tibet Plateau (QTP). Our results show that the Hongyuan alpine peatland was a CO2 sink with an annual NEE of −226.61 and −185.35 g C m–2 in 2014 and 2015, respectively. While, the non-growing season NEE was 53.35 and 75.08 g C m–2 in 2014 and 2015, suggesting that non-growing seasons carbon emissions should not be neglected. Clear diurnal variation in NEE was observed during the observation period, with the maximum CO2 uptake appearing at 12:30 (Beijing time, UTC+8). The Q10 value of the non-growing season in 2014 and 2015 was significantly higher than that in the growing season, which suggested that the CO2 flux in the non-growing season was more sensitive to warming than that in the growing season. We investigated the multi-scale temporal variations in NEE during the growing season using wavelet analysis. On daily timescales, photosynthetically active radiation was the primary driver of NEE. Seasonal variation in NEE was mainly driven by soil temperature. The amount of precipitation was more responsible for annual variation of NEE. The increasing number of precipitation event was associated with increasing annual carbon uptake. This study highlights the need for continuous eddy covariance measurements and time series analysis approaches to deepen our understanding of the temporal variability in NEE and multi-scale correlation between NEE and environmental factors.

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Section: Discussionmentioning

confidence: 99%

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

et al. 2022

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“…ChinaFLUX has developed a series of methods for processing flux data including flux calculation, gap-filling, partitioning, and quality assurance methods ( Yu et al, 2006 ; Han et al, 2020 ). In this study, the flux data were filtered and corrected using the standard ChinaFLUX process, which involves coordinate rotation, Webb–Pearman–Leuning correction ( Webb et al, 2010 ), outlier filtering, nighttime CO 2 flux correction using site-specific thresholds of friction velocity (u*), and gap-filling ( Reichstein et al, 2005 ).…”

Section: Methodsmentioning

confidence: 99%

Community Composition and Structure Affect Ecosystem and Canopy Water Use Efficiency Across Three Typical Alpine Ecosystems

Zhang

Shao

et al. 2022

Front. Plant Sci.

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Unique ecosystems distributed in alpine areas of the Qinghai–Tibetan Plateau play important roles in climate change mitigation, local food supply, and conservation of species diversity. To understand the water use efficiency (WUE) of this fragile and sensitive region, this study combined observed data from the eddy covariance system and the Shuttleworth–Wallace (S-W) model to measure the continuous mass exchange, including gross primary productivity (GPP), evapotranspiration (ET), and canopy transpiration (T) throughout 2 or 3 years (2016–2018) in three common alpine ecosystems (i.e., alpine steppe, alpine meadow, and alpine swamp). These ecosystems represent a water availability gradient and thus provide the opportunity to quantify environmental and biological controls on WUE at various spatiotemporal scales. We analyzed the ecosystem WUE (WUEe; defined as the ratio of GPP to ET) and canopy WUE (WUEc; defined as the ratio of GPP and canopy T). It was found that the yearly WUEe was 1.40, 1.63, and 2.16 g C kg–1 H2O, and the yearly WUEc was 8.93, 2.46, and 5.19 g C kg–1 H2O in the three typical ecosystems, respectively. The controlling factors of yearly WUE diverged between WUEe and WUEc. We found that plant functional group proportion (e.g., gramineous and Cyperaceae) highly explained the yearly WUEe variation across sites, and a good correlation was observed between community species diversity and WUEc. These findings suggest that community composition and trait change are critical in regulating WUEe and WUEc across different alpine ecosystems and that the regulation mechanisms may differ fundamentally between WUEe and WUEc.

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“…In addition, GPP in China presents obvious seasonality [51]. The seasonal dynamics of GPP among the different ecological zones present a single-peak type, with the maximum values occurring in summer [52]. The negative impacts of climate change on China's natural ecosystems and agriculture have been widely reported [53][54][55].…”

Section: Study Regionmentioning

confidence: 99%

Impacts of Heat and Drought on Gross Primary Productivity in China

et al. 2021

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Heat and drought stress, which often occur together, are the main environmental factors limiting the survival and growth of vegetation. Studies on the response of gross primary production (GPP) to extreme climate events such as heat and drought are highly significant for the identification of ecologically vulnerable regions, ecological risk assessments, and ecological environmental protection. We got 1982–2017 climatic data from the University of East Anglia Climatic Research Unit, Norwich, England, and GPP data from National Earth System Science Data Sharing Service Platform, Beijing, China. Using Theil–Sen median trend analysis and the Mann–Kendall test, we analyzed trends in temperature and the standardized precipitation/standardized precipitation evapotranspiration indices in the eight vegetation regions of China. Additionally, the response of GPP to the single and combined impacts of heat and drought were analyzed using multidimensional copula functions, and GPP reduction probabilities were estimated under different drought levels and heat intensities. The results showed that the probability of a drastic GPP reduction increases with increasing drought levels and heat intensities. The combined impacts of heat and drought on vegetation productivity is greater than the impacts of either drought or heat alone and presents a nonlinear superposition of the two extremes. The impact of heat on GPP is not evident when the drought level is high. The temperate grassland and warm temperate deciduous broad-leaved forest regions are the most sensitive regions to drought and heat in China. This study provides a scientific basis for the comprehensive evaluation of the risk of GPP reduction under the single and combined impacts of heat stress and drought stress.

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Spatial patterns and climate controls of seasonal variations in carbon fluxes in China's terrestrial ecosystems

Cited by 22 publications

References 45 publications

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

Environmental Controls on Multi-Scale Dynamics of Net Carbon Dioxide Exchange From an Alpine Peatland on the Eastern Qinghai-Tibet Plateau

Community Composition and Structure Affect Ecosystem and Canopy Water Use Efficiency Across Three Typical Alpine Ecosystems

Impacts of Heat and Drought on Gross Primary Productivity in China

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