Assessment of the importance of increasing temperature and decreasing soil moisture on global ecosystem productivity using solar‐induced chlorophyll fluorescence

Dang, Chaoya; Shao, Zhenfeng; Huang, Xiao; Qian, Jiaxin; Cheng, Gui; Qiu-lin, Ding; Fan, Yuxin

doi:10.1111/gcb.16043

Cited by 63 publications

(22 citation statements)

References 90 publications

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“…Our research found that climatic factors have a greater influence on the spatial distribution of SOCS than other environmental factors (i.e., terrain, land use, and land cover [LULC], organism and soil factors). this finding could be attributed to the sensitivity of SOC decomposition and accumulation to climate change (e.g., warmer temperatures and less precipitation) (Dang et al, 2022; Davidson & Janssens, 2006). Indeed, litter produced during vegetation growth is the main source of soil carbon input (Stuart Chapin Iii et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Changes in soil organic carbon stocks from 1980‐1990 and 2010‐2020 in the northwest arid zone of China

et al. 2022

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Soil is the largest carbon reservoir in terrestrial ecosystems, and thus minor changes in it can dramatically affect atmospheric CO2 concentrations. In the northwestern arid zone of China, the prediction of soil organic carbon (SOC) changes is often limited by the scarcity of soil samples and the scale and depth of research, which limit the understanding of carbon cycling processes in arid zone terrestrial ecosystems. Therefore, this study produced digital soil maps of SOC stocks (SOCS) for two periods (1980‐1990 and 2010‐2020) at a 90‐m resolution based on historical soil profile data and a random forest model. The results showed that the prediction accuracy for SOCS in the topsoil (0–30 cm) was superior to that of the subsoil (30–100 cm). Among them, the mean annual evapotranspiration, normalized difference vegetation index during the growing season, multi‐year mean temperature, and clay content were the main environmental factors affecting the spatial distribution of SOCS. In the past 30 years, the SOCS of the northwestern arid zone has decreased by 585.50 Tg, with a mean decline of 19.52 Tg C yr−1. The changes in SOCS caused by land‐use conversion and reductions in SOCS were further shown to be attributable to grassland desertification and agricultural reclamation. These findings are valuable for exploring the carbon cycle in terrestrial ecosystems in the context of global climate change and for achieving China's goal of carbon neutrality.

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Section: Discussionmentioning

confidence: 99%

Changes in soil organic carbon stocks from 1980‐1990 and 2010‐2020 in the northwest arid zone of China

et al. 2022

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“…VPD and SM are commonly used indicators for atmosphere and soil dryness, respectively [ 42 , 43 , 44 ]. A significant effect by drought on vegetation greenup development was observed in this study.…”

Section: Discussionmentioning

confidence: 99%

“…The GLEAM v3.5a dataset was produced by combining satellite and reanalysis data, which provides temporally/spatially continuous SM at spatial resolution of 0.25° (~25 km), spanning from 1980 to 2020. The overall performance accuracy of GLEAM SM products is considerably high [ 43 ]. The mean values in spring were calculated for all climatic factors.…”

Section: Methodsmentioning

confidence: 99%

Climate Controls on the Spatial Variability of Vegetation Greenup Rate across Ecosystems in Northern Hemisphere

Zheng

2022

Plants

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Variations in individual phenological events in response to global change have received considerable attentions. However, the development of phenological stages is relatively neglected, especially based on in situ observation data. In this study, the rate of vegetation greenup (Vgreenup) across the Northern Hemisphere was examined for different plant functional types (PFTs) by using eddy covariance flux data from 40 sites (417 site-years). Then, the controls of climatic variables on the spatial distribution of Vgreenup across PFTs were further investigated. The mean Vgreenup was 0.22 ± 0.11 g C m−2 day−2 across all sites, with the largest and lowest values observed in cropland and evergreen needle-leaf forest, respectively. A strong latitude dependence by Vgreenup was observed in both Europe and North America. The spatial variations of Vgreenup were jointly regulated by the duration of greenup (Dgreenup) and the amplitude of greenup (Agreenup). However, the predominant factor was Dgreenup in Europe, which changed to Agreenup in North America. Spring climatic factors exerted significant influences on the spatial distribution of Vgreenup across PFTs. Specifically, increasing temperature tended to shorten Dgreenup and inhibit Agreenup simultaneously, resulting in an acceleration of Vgreenup. Dryness had a depression effect on Vgreenup for the whole study area, as exhibited by a lower Vgreenup with increasing vapor pressure deficit or decreasing soil moisture. However, Vgreenup in North America was only significantly and positively correlated with temperature. Without the limitation of other climatic factors, the temperature sensitivity of Vgreenup was higher in North America (0.021 g C m−2 day−2 °C−1) than in Europe (0.015 g C m−2 day−2 °C−1). This study provides new cognitions for Vgreenup dynamics from in situ observations in complement to satellite observations, which can improve our understanding of terrestrial carbon cycles.

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“…For example, compared with VPD, SM is the dominant driver of dryness stress on ecosystem production that is characterized by SIF [43]. Similarly, using SIF as a proxy for GPP, Dang et al [44] demonstrated that SM plays a more important role, and SIF is very sensitive to aridity gradients in arid and semi-arid ecosystems. The results coincided with our reports.…”

Section: Pros and Cons Of F760tot For Drought Monitoringmentioning

confidence: 99%

Assessing the Potential of Downscaled Far Red Solar-Induced Chlorophyll Fluorescence from the Canopy to Leaf Level for Drought Monitoring in Winter Wheat

Lin

Shen

et al. 2022

Remote Sensing

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Solar-induced chlorophyll fluorescence (SIF) from ground, airborne, and satellite-based observations has been increasingly used in drought monitoring recently due to its close relationship with photosynthesis. SIF emissions respond rapidly to droughts, relative to the widely used vegetation indices (VIs), thus indicating their potential for early drought monitoring. The response of SIF to droughts can be attributed to the confounding effects of both the physiology and canopy structure. In order to reduce the reabsorption and scattering effects, the total emitted SIF (SIFtot) was proposed and served as a better tool to estimate GPP compared with the top-of-canopy SIF (SIFtoc). However, the response time and response magnitude of SIFtot to droughts and its relationships with the environmental parameters and soil moisture (SM) (i.e., the knowledge of drought monitoring using SIFtot) remains unclear. Here, the continuous ground data of F760toc (SIFtoc at 760 nm) from a nadir view that was downscaled to F760tot (SIFtot at 760 nm), NIRv, and the NDVI, SM, meteorological, and crop growth parameters were measured from four winter wheat plots with different intensities of drought (well-watered, moderate drought, severe drought, and extreme drought) over 2 months. The results indicated that F760tot was more closely correlated with the SM than the VIs at short time lags but weaker at longer time lags. The daily mean values of F760tot and NIRv were able to distinguish the differences between different drought levels, and F760tot responded quickly to the onset of drought, especially for the moderate drought intensity. These findings demonstrated that F760tot has potential for early drought monitoring and may contribute to mitigating the risk of agricultural drought.

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Assessment of the importance of increasing temperature and decreasing soil moisture on global ecosystem productivity using solar‐induced chlorophyll fluorescence

Cited by 63 publications

References 90 publications

Changes in soil organic carbon stocks from 1980‐1990 and 2010‐2020 in the northwest arid zone of China

Changes in soil organic carbon stocks from 1980‐1990 and 2010‐2020 in the northwest arid zone of China

Climate Controls on the Spatial Variability of Vegetation Greenup Rate across Ecosystems in Northern Hemisphere

Assessing the Potential of Downscaled Far Red Solar-Induced Chlorophyll Fluorescence from the Canopy to Leaf Level for Drought Monitoring in Winter Wheat

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