Dataset Information

A global 0.05° dataset for gross primary production of sunlit and shaded vegetation canopies from 1992 to 2020.

ABSTRACT: Distinguishing gross primary production of sunlit and shaded leaves (GPP_sun and GPP_shade) is crucial for improving our understanding of the underlying mechanisms regulating long-term GPP variations. Here we produce a global 0.05°, 8-day dataset for GPP, GPP_shade and GPP_sun over 1992-2020 using an updated two-leaf light use efficiency model (TL-LUE), which is driven by the GLOBMAP leaf area index, CRUJRA meteorology, and ESA-CCI land cover. Our products estimate the mean annual totals of global GPP, GPP_sun, and GPP_shade over 1992-2020 at 125.0 ± 3.8 (mean ± std) Pg C a^-1, 50.5 ± 1.2 Pg C a^-1, and 74.5 ± 2.6 Pg C a^-1, respectively, in which EBF (evergreen broadleaf forest) and CRO (crops) contribute more than half of the totals. They show clear increasing trends over time, in which the trend of GPP (also GPP_sun and GPP_shade) for CRO is distinctively greatest, and that for DBF (deciduous broadleaf forest) is relatively large and GPP_shade overwhelmingly outweighs GPP_sun. This new dataset advances our in-depth understanding of large-scale carbon cycle processes and dynamics.

SUBMITTER: Bi W

PROVIDER: S-EPMC9110750 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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A global 0.05° dataset for gross primary production of sunlit and shaded vegetation canopies from 1992 to 2020.

Bi Wenjun W He Wei W Zhou Yanlian Y Ju Weimin W Liu Yibo Y Liu Yang Y Zhang Xiaoyu X Wei Xiaonan X Cheng Nuo N

Scientific data 20220516 1

Distinguishing gross primary production of sunlit and shaded leaves (GPPsun and GPPshade) is crucial for improving our understanding of the underlying mechanisms regulating long-term GPP variations. Here we produce a global 0.05°, 8-day dataset for GPP, GPPshade and GPPsun over 1992-2020 using an updated two-leaf light use efficiency model (TL-LUE), which is driven by the GLOBMAP leaf area index, CRUJRA meteorology, and ESA-CCI land cover. Our products ...[more]

PMID: 35577806

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Project description:Monitoring the components of crop canopies with remote sensing can help us understand the within-canopy variation in spectral properties and resolve the sources of uncertainties in the spectroscopic estimation of crop foliar chemistry. To date, the spectral properties of leaves and panicles in crop canopies and the shadow effects on their spectral variation remain poorly understood due to the insufficient spatial resolution of traditional spectroscopy data. To address this issue, we used a near-ground imaging spectroscopy system with high spatial and spectral resolutions to examine the spectral properties of rice leaves and panicles in sunlit and shaded portions of canopies and evaluate the effect of shadows on the relationships between spectral indices of leaves and foliar chlorophyll content. The results demonstrated that the shaded components exhibited lower reflectance amplitude but stronger absorption features than their sunlit counterparts. Specifically, the reflectance spectra of panicles had unique double-peak absorption features in the blue region. Among the examined vegetation indices (VIs), significant differences were found in the photochemical reflectance index (PRI) between leaves and panicles and further differences in the transformed chlorophyll absorption reflectance index (TCARI) between sunlit and shaded components. After an image-level separation of canopy components with these two indices, statistical analyses revealed much higher correlations between canopy chlorophyll content and both PRI and TCARI of shaded leaves than for those of sunlit leaves. In contrast, the red edge chlorophyll index (CIRed-edge) exhibited the strongest correlations with canopy chlorophyll content among all vegetation indices examined regardless of shadows on leaves. These findings represent significant advances in the understanding of rice leaf and panicle spectral properties under natural light conditions and demonstrate the significance of commonly overlooked shaded leaves in the canopy when correlated to canopy chlorophyll content.

Dataset Information

A global 0.05° dataset for gross primary production of sunlit and shaded vegetation canopies from 1992 to 2020.

Publications

A global 0.05° dataset for gross primary production of sunlit and shaded vegetation canopies from 1992 to 2020.

Similar Datasets

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