Structural complexity biases vegetation greenness measures.
Zeng, Y
Hao, D
Park, T
Zhu, P
Huete, A
Myneni, R
Knyazikhin, Y
Qi, J
Nemani, RR
Li, F
Huang, J
Gao, Y
Li, B
Ji, F
Köhler, P
Frankenberg, C
Berry, JA
Chen, M
- Publisher:
- NATURE PORTFOLIO
- Publication Type:
- Journal Article
- Citation:
- Nat Ecol Evol, 2023, 7, (11), pp. 1790-1798
- Issue Date:
- 2023-11
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22200906_13160107610005671.pdf | Published version | 12.84 MB |
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Full metadata record
Field | Value | Language |
---|---|---|
dc.contributor.author | Zeng, Y | |
dc.contributor.author | Hao, D | |
dc.contributor.author | Park, T | |
dc.contributor.author | Zhu, P | |
dc.contributor.author |
Huete, A https://orcid.org/0000-0003-2809-2376 |
|
dc.contributor.author | Myneni, R | |
dc.contributor.author | Knyazikhin, Y | |
dc.contributor.author | Qi, J | |
dc.contributor.author | Nemani, RR | |
dc.contributor.author | Li, F | |
dc.contributor.author | Huang, J | |
dc.contributor.author | Gao, Y | |
dc.contributor.author | Li, B | |
dc.contributor.author | Ji, F | |
dc.contributor.author | Köhler, P | |
dc.contributor.author | Frankenberg, C | |
dc.contributor.author | Berry, JA | |
dc.contributor.author | Chen, M | |
dc.date.accessioned | 2024-03-15T00:24:01Z | |
dc.date.available | 2023-08-03 | |
dc.date.available | 2024-03-15T00:24:01Z | |
dc.date.issued | 2023-11 | |
dc.identifier.citation | Nat Ecol Evol, 2023, 7, (11), pp. 1790-1798 | |
dc.identifier.issn | 2397-334X | |
dc.identifier.issn | 2397-334X | |
dc.identifier.uri | http://hdl.handle.net/10453/176738 | |
dc.description.abstract | Vegetation 'greenness' characterized by spectral vegetation indices (VIs) is an integrative measure of vegetation leaf abundance, biochemical properties and pigment composition. Surprisingly, satellite observations reveal that several major VIs over the US Corn Belt are higher than those over the Amazon rainforest, despite the forests having a greater leaf area. This contradicting pattern underscores the pressing need to understand the underlying drivers and their impacts to prevent misinterpretations. Here we show that macroscale shadows cast by complex forest structures result in lower greenness measures compared with those cast by structurally simple and homogeneous crops. The shadow-induced contradictory pattern of VIs is inevitable because most Earth-observing satellites do not view the Earth in the solar direction and thus view shadows due to the sun-sensor geometry. The shadow impacts have important implications for the interpretation of VIs and solar-induced chlorophyll fluorescence as measures of global vegetation changes. For instance, a land-conversion process from forests to crops over the Amazon shows notable increases in VIs despite a decrease in leaf area. Our findings highlight the importance of considering shadow impacts to accurately interpret remotely sensed VIs and solar-induced chlorophyll fluorescence for assessing global vegetation and its changes. | |
dc.format | Print-Electronic | |
dc.language | eng | |
dc.publisher | NATURE PORTFOLIO | |
dc.relation.ispartof | Nat Ecol Evol | |
dc.relation.isbasedon | 10.1038/s41559-023-02187-6 | |
dc.rights | info:eu-repo/semantics/closedAccess | |
dc.subject.classification | 3103 Ecology | |
dc.subject.classification | 3104 Evolutionary biology | |
dc.subject.classification | 4104 Environmental management | |
dc.subject.mesh | Seasons | |
dc.subject.mesh | Forests | |
dc.subject.mesh | Rainforest | |
dc.subject.mesh | Bias | |
dc.subject.mesh | Chlorophyll | |
dc.subject.mesh | Chlorophyll | |
dc.subject.mesh | Seasons | |
dc.subject.mesh | Forests | |
dc.subject.mesh | Rainforest | |
dc.subject.mesh | Bias | |
dc.subject.mesh | Seasons | |
dc.subject.mesh | Forests | |
dc.subject.mesh | Rainforest | |
dc.subject.mesh | Bias | |
dc.subject.mesh | Chlorophyll | |
dc.title | Structural complexity biases vegetation greenness measures. | |
dc.type | Journal Article | |
utslib.citation.volume | 7 | |
utslib.location.activity | England | |
pubs.organisational-group | University of Technology Sydney | |
pubs.organisational-group | University of Technology Sydney/Faculty of Science | |
pubs.organisational-group | University of Technology Sydney/Faculty of Science/School of Life Sciences | |
pubs.organisational-group | University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems | |
utslib.copyright.status | closed_access | * |
dc.date.updated | 2024-03-15T00:23:58Z | |
pubs.issue | 11 | |
pubs.publication-status | Published | |
pubs.volume | 7 | |
utslib.citation.issue | 11 |
Abstract:
Vegetation 'greenness' characterized by spectral vegetation indices (VIs) is an integrative measure of vegetation leaf abundance, biochemical properties and pigment composition. Surprisingly, satellite observations reveal that several major VIs over the US Corn Belt are higher than those over the Amazon rainforest, despite the forests having a greater leaf area. This contradicting pattern underscores the pressing need to understand the underlying drivers and their impacts to prevent misinterpretations. Here we show that macroscale shadows cast by complex forest structures result in lower greenness measures compared with those cast by structurally simple and homogeneous crops. The shadow-induced contradictory pattern of VIs is inevitable because most Earth-observing satellites do not view the Earth in the solar direction and thus view shadows due to the sun-sensor geometry. The shadow impacts have important implications for the interpretation of VIs and solar-induced chlorophyll fluorescence as measures of global vegetation changes. For instance, a land-conversion process from forests to crops over the Amazon shows notable increases in VIs despite a decrease in leaf area. Our findings highlight the importance of considering shadow impacts to accurately interpret remotely sensed VIs and solar-induced chlorophyll fluorescence for assessing global vegetation and its changes.
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