Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau
Abstract Canopy greening, which is associated with significant canopy structure changes, is the most notable signal of ecosystem changes in response to anthropogenic climate change. However, our knowledge of the changing pattern of canopy development and senescence, and its endogenous and climatic d...
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crwiley:10.1111/gcb.16668 2024-10-13T14:05:44+00:00 Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau Meng, Fandong Liu, Dan Wang, Yilong Wang, Shiping Wang, Tao National Natural Science Foundation of China 2023 http://dx.doi.org/10.1111/gcb.16668 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16668 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.16668 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 29, issue 11, page 3147-3158 ISSN 1354-1013 1365-2486 journal-article 2023 crwiley https://doi.org/10.1111/gcb.16668 2024-09-17T04:46:31Z Abstract Canopy greening, which is associated with significant canopy structure changes, is the most notable signal of ecosystem changes in response to anthropogenic climate change. However, our knowledge of the changing pattern of canopy development and senescence, and its endogenous and climatic drivers is still limited. Here, we used the Normalized Difference Vegetation Index (NDVI) to quantify the changes in the speed of canopy development and senescence over the Tibetan Plateau (TP) during 2000–2018, and used a solar‐induced chlorophyll fluorescence dataset as a proxy for photosynthesis, in combination with climate datasets to decipher the endogenous and climatic drivers of the interannual variation in canopy changes. We found that the canopy development during the early green‐up stage (April–May) is accelerating at a rate of 0.45–0.8 × 10 −3 month −1 year −1 . However, this accelerating canopy development was largely offset by a decelerating canopy development during June and July (−0.61 to −0.51 × 10 −3 month −1 year −1 ), leading to the peak NDVI over the TP increasing at a rate of only one fifth of that in northern temperate regions, and less than one tenth of that in the Arctic and boreal regions. During the green‐down period, we observed a significant accelerating canopy senescence during October. Photosynthesis was found to be the dominant driver for canopy changes over the TP. Increasing photosynthesis stimulates canopy development during the early green‐up stage. However, slower canopy development and accelerated senescence was found with larger photosynthesis in late growth stages. This negative relationship between photosynthesis and canopy development is probably linked to the source–sink balance of plants and shifts in the allocation regime. These results suggest a sink limitation for plant growth over the TP. The impact of canopy greening on the carbon cycle may be more complicated than the source‐oriented paradigm used in current ecosystem models. Article in Journal/Newspaper Arctic Climate change Wiley Online Library Arctic Global Change Biology 29 11 3147 3158 |
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Wiley Online Library |
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English |
description |
Abstract Canopy greening, which is associated with significant canopy structure changes, is the most notable signal of ecosystem changes in response to anthropogenic climate change. However, our knowledge of the changing pattern of canopy development and senescence, and its endogenous and climatic drivers is still limited. Here, we used the Normalized Difference Vegetation Index (NDVI) to quantify the changes in the speed of canopy development and senescence over the Tibetan Plateau (TP) during 2000–2018, and used a solar‐induced chlorophyll fluorescence dataset as a proxy for photosynthesis, in combination with climate datasets to decipher the endogenous and climatic drivers of the interannual variation in canopy changes. We found that the canopy development during the early green‐up stage (April–May) is accelerating at a rate of 0.45–0.8 × 10 −3 month −1 year −1 . However, this accelerating canopy development was largely offset by a decelerating canopy development during June and July (−0.61 to −0.51 × 10 −3 month −1 year −1 ), leading to the peak NDVI over the TP increasing at a rate of only one fifth of that in northern temperate regions, and less than one tenth of that in the Arctic and boreal regions. During the green‐down period, we observed a significant accelerating canopy senescence during October. Photosynthesis was found to be the dominant driver for canopy changes over the TP. Increasing photosynthesis stimulates canopy development during the early green‐up stage. However, slower canopy development and accelerated senescence was found with larger photosynthesis in late growth stages. This negative relationship between photosynthesis and canopy development is probably linked to the source–sink balance of plants and shifts in the allocation regime. These results suggest a sink limitation for plant growth over the TP. The impact of canopy greening on the carbon cycle may be more complicated than the source‐oriented paradigm used in current ecosystem models. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Meng, Fandong Liu, Dan Wang, Yilong Wang, Shiping Wang, Tao |
spellingShingle |
Meng, Fandong Liu, Dan Wang, Yilong Wang, Shiping Wang, Tao Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
author_facet |
Meng, Fandong Liu, Dan Wang, Yilong Wang, Shiping Wang, Tao |
author_sort |
Meng, Fandong |
title |
Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
title_short |
Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
title_full |
Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
title_fullStr |
Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
title_full_unstemmed |
Negative relationship between photosynthesis and late‐stage canopy development and senescence over Tibetan Plateau |
title_sort |
negative relationship between photosynthesis and late‐stage canopy development and senescence over tibetan plateau |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/gcb.16668 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16668 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.16668 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Global Change Biology volume 29, issue 11, page 3147-3158 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.16668 |
container_title |
Global Change Biology |
container_volume |
29 |
container_issue |
11 |
container_start_page |
3147 |
op_container_end_page |
3158 |
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1812811779862953984 |