Divergent impacts of atmospheric water demand on gross primary productivity in three typical ecosystems in China

Chen, Ning; Song, Chen; Xu, Xiaofeng; Wang, Xianwei; Cong, Nan; Jiang, Peipei; Zu, Jiaxing; Sun, Liqiang; Song, Yajing; Zuo, Yunjiang; Liu, Jianzhao; Zhang, Tao; Xu, Mingjie; Jiang, Peng; Wang, Zhipeng; Huang, Ke

doi:10.1016/j.agrformet.2021.108527

Cited by 49 publications

(24 citation statements)

References 51 publications

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“…Our results demonstrate that the relationships between VPD/SWC and GPP were influenced by climatic interactions (Figures 1a, 3, and 4e; Figures S5–S8), emphasizing that GPP sensitivity to VPD and SWC may differ under different climatic conditions. For example, the relationship between GPP and VPD was negative under dry conditions, but positive under wet conditions in Chinese grassland ecosystems (Chen et al, 2021). Furthermore, the VPD–GPP relationship is strongly influenced by climatic drivers (Figures 1a and 3), which may reflect the greater variability of VPD within a few hours caused by atmospheric drivers, compared with SWC changing slowly over several days (Sulman et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Dryness stress on ecosystem production has often been characterized by low soil water content (SWC) and high atmospheric water demand (i.e., vapor pressure deficit, VPD; Liu et al, 2020). The impacts of VPD and SWC on plants have been studied in recent years against the background of global warming (Chen et al, 2021; Denham et al, 2021). However, the dominance of VPD versus SWC on plant water stress is still under debate (Fu et al, 2022; Liu et al, 2020; Sulman et al, 2016; Yuan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Exploring complex water stress–gross primary production relationships: Impact of climatic drivers, main effects, and interactive effects

Wang

Yan

Ciais

et al. 2022

Global Change Biology

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The dominance of vapor pressure deficit (VPD) and soil water content (SWC) for plant water stress is still under debate. These two variables are strongly coupled and influenced by climatic drivers. The impacts of climatic drivers on the relationships between gross primary production (GPP) and water stress from VPD/SWC and the interaction between VPD and SWC are not fully understood. Here, applying statistical methods and extreme gradient boosting models—Shapley additive explanations framework to eddy‐covariance observations from the global FLUXNET2015 data set, we found that the VPD‐GPP relationship was strongly influenced by climatic interactions and that VPD was more important for plant water stress than SWC across most plant functional types when we removed the effect of main climatic drivers, e.g. air temperature, incoming shortwave radiation and wind speed. However, we found no evidence for a significant influence of elevated CO2 on stress alleviation, possibly because of the short duration of the records (approximately one decade). Additionally, the interactive effect between VPD and SWC differed from their individual effect. When SWC was high, the SHAP interaction value of SWC and VPD on GPP was decreased with increasing VPD, but when SWC was low, the trend was the opposite. Additionally, we revealed a threshold effect for VPD stress on GPP loss; above the threshold value, the stress on GPP was flattened off. Our results have important implications for independently identifying VPD and SWC limitations on plant productivity, which is meaningful for capturing the magnitude of ecosystem responses to water stress in dynamic global vegetation models.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploring complex water stress–gross primary production relationships: Impact of climatic drivers, main effects, and interactive effects

Wang

Yan

Ciais

et al. 2022

Global Change Biology

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“…Similar to the results of previous studies, the GPP we obtained varied with VPD as a unimodal curve, which was mainly manifested at all the FLUXNET forest sites. Studies have shown that when the VPD threshold is 6-8 hPa, and it determines whether the GPP response transitions from a significant increase to a decrease (Chen et al, 2021). Our results suggested that an increasing VPD under climate change could reduce forest CO 2 uptake (Sulman et al, 2016).…”

Section: The Impact Of Environmental Factors On Carbon Fluxmentioning

confidence: 62%

“…However, when the VPD is large, plants will close part of their stomata to reduce the loss caused by transpiration. Studies have shown that in forest ecosystems, GPP is not always restricted by the VPD, which is mainly due to forests having a stronger water holding capacity and deeper root systems (Beer et al, 2007;Chen et al, 2021;Gui et al, 2021). The GPP in these places is mainly affected by radiation or temperature.…”

Section: The Impact Of Environmental Factors On Carbon Fluxmentioning

confidence: 99%

“…These biological processes affecting the carbon cycle are not only affected by PAR and diffuse fertilization effects, but also by environmental factors (Normand et al, 2021;Shen et al, 2022a). The efficiency of photosynthetically-transpiration (respiration) is influenced by many factors, including air temperature, solar radiation, water availability, soil temperature, and forest canopy characteristics (Chen et al, 2021;Shen et al, 2022b). Oliphant et al (2011) reported that the net effect of vapor pressure deficit (VPD) and air temperature (TA) related to sky conditions contributes to enhancing the light response, although their effect is lower than that of total PAR.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Diffuse Radiation on Ecosystem Carbon Fluxes Across China From FLUXNET Forest Observations

et al. 2022

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Aerosol loading and cloud cover can alter the composition of radiation reaching the Earth’s surface and affect the ecosystem’s carbon cycle. In this study, we established an empirical model of the diffuse radiation fraction (Kd) based on a clearness index (Kt) to obtain the Kd of four FLUXNET forest sites in China. We focused on the relationships among the Kd, photosynthetically active radiation (PAR), light-use efficiency (LUE) and gross primary productivity (GPP) through mechanistic analysis. The relationships between carbon fluxes [including GPP, ecosystem respiration (ER), and net ecosystem exchange (NEE)] and the Kd were explored. Furthermore, we investigated the influence of environmental factors on carbon fluxes. The results showed that the Kd models were accurate in estimating Kd (R2= 0.88–0.93). Overall, the GPP first increased and then decreased with increasing Kd. When Kd< Ko (Ko, the diffuse radiation fraction corresponding to the maximum value of GPP), the direct PAR decreased as Kd increased, while the diffuse PAR increased rapidly. At this stage, the diffuse fertilization effect led to an increase in GPP. When Ko<Kd<Kdiff-max (Kdiff-max, the diffuse radiation fraction corresponding to the maximum value of diffuse PAR), as Kd increased the direct PAR still decreased and the diffuse PAR still increased, but the GPP declined. When Kd>Kdiff-max, the diffuse PAR began to decrease, and the reduction in the superimposed direct PAR caused the GPP of the canopy to drop rapidly. The LUE of the vegetation canopy was higher under diffuse light conditions than under direct light. Furthermore, with an increase in the Kd, the negative value change of the NEE was consistent with the GPP, but the ER was less affected by the Kd. Finally, the impact of temperature (TA) and vapor pressure deficit (VPD) on the GPP was unimodal, and the impact on the NEE was U-shaped. In addition, latent heat (LE) had a significant positive effect on GPP and NEE. Our study emphasized the relationship between the change in PAR composition and the Kd, as well as its impact on the carbon fluxes change, which is highly important to the study of carbon neutralization.

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Forest thinning increases surface soil temperature in Larix principis-rupprechtii (Pinaceae) plantations

Hao,

Le,

Song

et al. 2023

J Soils Sediments

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Divergent impacts of atmospheric water demand on gross primary productivity in three typical ecosystems in China

Cited by 49 publications

References 51 publications

Exploring complex water stress–gross primary production relationships: Impact of climatic drivers, main effects, and interactive effects

Exploring complex water stress–gross primary production relationships: Impact of climatic drivers, main effects, and interactive effects

The Effect of Diffuse Radiation on Ecosystem Carbon Fluxes Across China From FLUXNET Forest Observations

Forest thinning increases surface soil temperature in Larix principis-rupprechtii (Pinaceae) plantations

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