Understanding moisture stress on light use efficiency across terrestrial ecosystems based on global flux and remote‐sensing data

Zhang, Yulong; Song, Conghe; Sun, Ge; Band, Lawrence E.; Noormets, Asko; Zhang, Quanfa

doi:10.1002/2015jg003023

Cited by 46 publications

(39 citation statements)

References 58 publications

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“…Of note, temperature‐related water stress (controlled by a combination of temperature, VPD, and precipitation) is a major driver of ENSO‐induced regional GPP variability, especially in tropical and arid/semiarid areas (Ahlström et al, ; Hashimoto et al, ; Hilker et al, ; Humphrey et al, ). Canopy greenness indices such as LAI and FPAR appeared to be less responsive to ENSO (Figures d and S4b), indicating that they may not fully reflect the linkage of GPP with ENSO without explicitly accounting for climate constraints (Gonsamo et al, ; Woodward et al, ; Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era

et al. 2019

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Terrestrial gross primary production (GPP) is the largest carbon flux entering the biosphere from the atmosphere, which serves as a key driver of global carbon cycle and provides essential matter and energy for life on land. However, terrestrial GPP variability is still poorly understood and difficult to predict, especially at the annual scale. As a major internal climate oscillation, El Niño-Southern Oscillation (ENSO) influences global climate patterns and thus may strongly alter interannual terrestrial GPP variation. Using a remote sensing-driven ecosystem model with long-term satellite and climate data, we comprehensively examined the impacts of ENSO on global GPP dynamics from 1982 to 2016, focusing on lag effects of ENSO and their spatial heterogeneity. We found a clear seasonal lag effect of previous-year ENSO indices on current-year global GPP variability. The composite Oceanic Niño Index in the previous-year's August-October showed the strongest correlation with global annual GPP (R = −0.51, p < 0.01). Spatially, 20.1% and 11.7% of vegetated land area showed significant negative and positive correlations with the ENSO cycle, respectively. ENSO effects on annual GPP exhibited diverse seasonal evolutions, and the timings of peak ENSO influences were heterogeneous across the globe. Annual GPP from TRENDY land surface model ensemble did not capture the major lag effects of ENSO identified in the satellite-derived GPP and top-down-based land sink. Despite the complexity of the climate system, our efforts linking ENSO with global GPP dynamics provide a simple framework to understand and project climatic influences on the terrestrial carbon cycle.

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Section: Discussionmentioning

confidence: 99%

El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era

et al. 2019

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“…However, the effect of soil water content was not directly modeled in CCW. Although VPD and soil moisture are better coupled at monthly time steps (Novick et al, ) and the data‐driven method used in this study could implicitly incorporate this covariance (Zhang et al, ; Zhang et al, ), the sensitivity of LUE to VPD may vary along with soil moisture gradients (Novick et al, ), which is worthy of being investigated and included in CCW in the future. In this study, we conducted model simulations to separate the effects of VCC and climate on GPP.…”

Section: Discussionmentioning

confidence: 99%

No Proportional Increase of Terrestrial Gross Carbon Sequestration From the Greening Earth

et al. 2019

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Terrestrial vegetation, as the key component of the biosphere, has a greening trend since the beginning of this century. However, how this substantial greening translated to global gross carbon sequestration or gross primary production (GPP) is not clear. Here we investigated terrestrial GPP dynamics and the respective contributions of climate change and vegetation cover change (VCC) from 2000 to 2015. We adopted a remote sensing based data-driven model, which was calibrated based on the global eddy flux data set (FLUXNET2015) and Moderate Resolution Imaging Spectroradiometer vegetation index data (Collection 6). A series of simulation experiments were conducted to disaggregate the effects of climate and VCC. We found a much weaker increase in global GPP (0.08%/year; P = 0.07) when compared with the global greening rate (0.23%/year; P < 0.001). The positive effect of VCC on GPP was reduced by 53% due to climate stress. Enhanced global GPP were largely contributed by nonforests, especially croplands. However, tropical forests, once a major driver of the global GPP increase, negatively contributed to global GPP trend due to warming-induced moisture stress and deforestation. Given the limited potential of cropland carbon storage due to harvest and consumption, the contrasting GPP changes (i.e., cropland GPP increase vs. forest GPP reduction) may have shifted the distribution of the land carbon sink. Our study highlights the potential vulnerability of terrestrial gross carbon sequestration under climate and land use changes and has important implications in the global carbon cycle and climate warming mitigation.

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“…Similar biome‐based differences were also reported by Zhang et al . []. Because the absolute anomaly of VPD (Δ VPD ) shows an advantage over the relative anomaly ( δ VPD ) in both partial correlation analysis and the regression model (Figure and Table ), it also suggests a nonlinear response of VPD control on photosynthesis rather than the piecewise function currently used in MODIS PSN model [ Running et al , ].…”

Section: Discussionmentioning

confidence: 99%

Canopy and physiological controls of GPP during drought and heat wave

Zhang

Xiao

Zhou

et al. 2016

Geophysical Research Letters

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Vegetation indices (VIs) derived from satellite reflectance measurements are often used as proxies of canopy activity to evaluate the impacts of drought and heat wave on gross primary production (GPP) through production efficiency models. However, GPP is also regulated by physiological processes that cannot be directly detected using reflectance measurements. This study analyzes the co‐limitation of canopy and plant physiology (represented by VIs and climate anomalies, respectively) on GPP during the 2003 European summer drought and heat wave for 15 Euroflux sites. During the entire drought period, spatial pattern of GPP anomalies can be quantified by relative changes in VIs. We also find that GPP sensitivity to relative canopy changes is higher for nonforest ecosystems (1.81 ± 0.32%GPP/%enhanced vegetation index), while GPP sensitivity to physiological changes is higher for forest ecosystems (−0.18 ± 0.05 g C m−2 d−1/hPa). A conceptual model is further built to better illustrate the canopy and physiological controls on GPP during drought periods.

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Understanding moisture stress on light use efficiency across terrestrial ecosystems based on global flux and remote‐sensing data

Cited by 46 publications

References 58 publications

El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era

El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era

No Proportional Increase of Terrestrial Gross Carbon Sequestration From the Greening Earth

Canopy and physiological controls of GPP during drought and heat wave

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