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Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia

The general level of haze has increased rapidly in tropical regions over the last decades. To reveal the effects of haze on tropical forest ecosystem, photosynthetic photon flux density (PFD) at the top of and within a tropical forest canopy was measured on days with and without visible haze, in the...

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Main Authors: Tang, Yanhong, Naoki, Kachi, Akio, Furukawa, Awang, Muhamad
Format: Article
Language:English
English
Published: Elsevier 1996
Online Access:http://psasir.upm.edu.my/id/eprint/42389/1/Light%20reduction%20by%20regional%20haze%20and%20its%20effect%20on%20simulated%20leaf%20photosynthesis%20in%20a%20tropical%20forest%20of%20Malaysia.pdf
http://psasir.upm.edu.my/id/eprint/42389/7/1-s2.0-S0378112796038492-main.pdf
http://psasir.upm.edu.my/id/eprint/42389/
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spelling my.upm.eprints.423892024-08-05T23:43:36Z http://psasir.upm.edu.my/id/eprint/42389/ Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia Tang, Yanhong Naoki, Kachi Akio, Furukawa Awang, Muhamad The general level of haze has increased rapidly in tropical regions over the last decades. To reveal the effects of haze on tropical forest ecosystem, photosynthetic photon flux density (PFD) at the top of and within a tropical forest canopy was measured on days with and without visible haze, in the Pasoh Forest Reserve, Peninsular Malaysia. Total daily PFD at 40 m aboveground on hazy days was only about 50% of that on the days without visible haze. The reduction of PFD on hazy days was much larger at 50 cm aboveground within the forest. During the period with haze, the forest understory received few PFD higher than 50 μ mol photons m−2 s−1. Photosynthetic carbon gain was estimated to examine the potential effect of PFD extinction by haze. Under hazy conditions, the simulated net carbon gain, which included photosynthetic carbon gain of daytime and respiratory carbon loss at night, decreased to about −6 mmol CO2 m−2 for an ‘average’ shade leaf of understory plants. This marked decrease of leaf carbon gain might have important impacts on the growth and survival of understory plants, and therefore on the regeneration of tree species in the tropical forest. Elsevier 1996-12 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/42389/1/Light%20reduction%20by%20regional%20haze%20and%20its%20effect%20on%20simulated%20leaf%20photosynthesis%20in%20a%20tropical%20forest%20of%20Malaysia.pdf text en http://psasir.upm.edu.my/id/eprint/42389/7/1-s2.0-S0378112796038492-main.pdf Tang, Yanhong and Naoki, Kachi and Akio, Furukawa and Awang, Muhamad (1996) Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia. Forest Ecology and Management, 89 (1-3). pp. 205-211. ISSN 0378-1127; ESSN: 1872-7042 10.1016/S0378-1127(96)03849-2
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description The general level of haze has increased rapidly in tropical regions over the last decades. To reveal the effects of haze on tropical forest ecosystem, photosynthetic photon flux density (PFD) at the top of and within a tropical forest canopy was measured on days with and without visible haze, in the Pasoh Forest Reserve, Peninsular Malaysia. Total daily PFD at 40 m aboveground on hazy days was only about 50% of that on the days without visible haze. The reduction of PFD on hazy days was much larger at 50 cm aboveground within the forest. During the period with haze, the forest understory received few PFD higher than 50 μ mol photons m−2 s−1. Photosynthetic carbon gain was estimated to examine the potential effect of PFD extinction by haze. Under hazy conditions, the simulated net carbon gain, which included photosynthetic carbon gain of daytime and respiratory carbon loss at night, decreased to about −6 mmol CO2 m−2 for an ‘average’ shade leaf of understory plants. This marked decrease of leaf carbon gain might have important impacts on the growth and survival of understory plants, and therefore on the regeneration of tree species in the tropical forest.
format Article
author Tang, Yanhong
Naoki, Kachi
Akio, Furukawa
Awang, Muhamad
spellingShingle Tang, Yanhong
Naoki, Kachi
Akio, Furukawa
Awang, Muhamad
Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
author_facet Tang, Yanhong
Naoki, Kachi
Akio, Furukawa
Awang, Muhamad
author_sort Tang, Yanhong
title Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
title_short Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
title_full Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
title_fullStr Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
title_full_unstemmed Light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of Malaysia
title_sort light reduction by regional haze and its effect on simulated leaf photosynthesis in a tropical forest of malaysia
publisher Elsevier
publishDate 1996
url http://psasir.upm.edu.my/id/eprint/42389/1/Light%20reduction%20by%20regional%20haze%20and%20its%20effect%20on%20simulated%20leaf%20photosynthesis%20in%20a%20tropical%20forest%20of%20Malaysia.pdf
http://psasir.upm.edu.my/id/eprint/42389/7/1-s2.0-S0378112796038492-main.pdf
http://psasir.upm.edu.my/id/eprint/42389/
_version_ 1806690467981557760
score 13.211869

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