scholarly journals Occurrence of stomatal patchiness and its spatial scale in leaves from various sizes of trees distributed in a South-east Asian tropical rainforest in Peninsular Malaysia

2015 ◽  
Vol 35 (1) ◽  
pp. 61-70 ◽  
Author(s):  
M. Kamakura ◽  
Y. Kosugi ◽  
S. Takanashi ◽  
A. Uemura ◽  
H. Utsugi ◽  
...  
Keyword(s):  
Spatial Scale ◽  
Tropical Rainforest ◽  
East Asian ◽  
Peninsular Malaysia ◽  
Stomatal Patchiness

Vertical profiles and storage fluxes of CO2, heat and water in a tropical rainforest at Pasoh, Peninsular Malaysia

Tellus B ◽  
2008 ◽  
Vol 60 (4) ◽  
Author(s):  
Shinjiro Ohkubo ◽  
Yoshiko Kosugi ◽  
Satoru Takanashi ◽  
Naoko Matsuo ◽  
Makoto Tani ◽  
...  
Keyword(s):  
Tropical Rainforest ◽  
Peninsular Malaysia ◽  
Vertical Profiles ◽  
And Storage

Man's impact on the tropical rainforest of Peninsular Malaysia: A review

1975 ◽  
Vol 8 (3) ◽  
pp. 213-229 ◽  
Author(s):  
S.Robert Aiken ◽  
Michael R. Moss
Keyword(s):  
Tropical Rainforest ◽  
Peninsular Malaysia

scholarly journals In situ measurements of isoprene and monoterpenes within a south-east Asian tropical rainforest

2011 ◽  
Vol 11 (14) ◽  
pp. 6971-6984 ◽  
Author(s):  
C. E. Jones ◽  
J. R. Hopkins ◽  
A. C. Lewis
Keyword(s):  
Tropical Rainforest ◽  
East Asian ◽  
Ground Level ◽  
Ambient Air ◽  
Tropical Rainforests ◽  
Light Conditions ◽  
Mixing Ratios ◽  
Volatile Carbon ◽  
Malaysian Borneo

Abstract. Biogenic volatile organic compounds (BVOCs) emitted from tropical rainforests comprise a substantial fraction of global atmospheric VOC emissions, however there are only relatively limited measurements of these species in tropical rainforest regions. We present observations of isoprene, α-pinene, camphene, Δ-3-carene, γ-terpinene and limonene, as well as oxygenated VOCs (OVOCs) of biogenic origin such as methacrolein, in ambient air above a tropical rainforest in Malaysian Borneo during the Oxidant and Particle Photochemical Processes above a south-east Asian tropical rainforest (OP3) project in 2008. Daytime composition was dominated by isoprene, with an average mixing ratio of the order of ~1 ppb. γ-terpinene, limonene and camphene were the most abundant monoterpenes, with average daytime mixing ratios of 102, 71 and 66 ppt respectively, and with an average monoterpene toisoprene ratio of 0.3 during sunlit hours, compared to 2.0 at night. Limonene and camphene abundances were seen to be related to both temperature and light conditions. In contrast, γ-terpinene emission continued into the late afternoon/evening, under relatively low temperature and light conditions. The contributions of isoprene, monoterpenes and other classes of VOC to the volatile carbon budget and OH reactivity have been summarised for this rainforest location. We observe good agreement between surface and aircraft measurements of boundary layer isoprene and methacrolein above the natural rainforest, suggesting that the ground-level observations are broadly representative of isoprene emissions from this region.

scholarly journals Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest

2010 ◽  
Vol 10 (17) ◽  
pp. 8391-8412 ◽  
Author(s):  
B. Langford ◽  
P. K. Misztal ◽  
E. Nemitz ◽  
B. Davison ◽  
C. Helfter ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Tropical Forests ◽  
Atmospheric Chemistry ◽  
Carbon Flux ◽  
Tropical Rainforest ◽  
East Asian ◽  
Emission Rates ◽  
Reactive Carbon ◽  
Volatile Organic

Abstract. As part of the OP3 field study of rainforest atmospheric chemistry, above-canopy fluxes of isoprene, monoterpenes and oxygenated volatile organic compounds were made by virtual disjunct eddy covariance from a South-East Asian tropical rainforest in Malaysia. Approximately 500 hours of flux data were collected over 48 days in April–May and June–July 2008. Isoprene was the dominant non-methane hydrocarbon emitted from the forest, accounting for 80% (as carbon) of the measured emission of reactive carbon fluxes. Total monoterpene emissions accounted for 18% of the measured reactive carbon flux. There was no evidence for nocturnal monoterpene emissions and during the day their flux rate was dependent on both light and temperature. The oxygenated compounds, including methanol, acetone and acetaldehyde, contributed less than 2% of the total measured reactive carbon flux. The sum of the VOC fluxes measured represents a 0.4% loss of daytime assimilated carbon by the canopy, but atmospheric chemistry box modelling suggests that most (90%) of this reactive carbon is returned back to the canopy by wet and dry deposition following chemical transformation. The emission rates of isoprene and monoterpenes, normalised to 30 °C and 1000 μmol m−2 s−1 PAR, were 1.6 mg m−2 h−1 and 0.46mg m−2 h−1 respectively, which was 4 and 1.8 times lower respectively than the default value for tropical forests in the widely-used MEGAN model of biogenic VOC emissions. This highlights the need for more direct canopy-scale flux measurements of VOCs from the world's tropical forests.

scholarly journals Evapotranspiration and water source of a tropical rainforest in peninsular Malaysia

2017 ◽  
Vol 31 (24) ◽  
pp. 4338-4353 ◽  
Author(s):  
Marryanna Lion ◽  
Yoshiko Kosugi ◽  
Satoru Takanashi ◽  
Shoji Noguchi ◽  
Masayuki Itoh ◽  
...  
Keyword(s):  
Tropical Rainforest ◽  
Water Source ◽  
Peninsular Malaysia

scholarly journals Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools

2010 ◽  
Vol 10 (1) ◽  
pp. 169-199 ◽  
Author(s):  
C. N. Hewitt ◽  
J. D. Lee ◽  
A. R. MacKenzie ◽  
M. P. Barkley ◽  
N. Carslaw ◽  
...  
Keyword(s):  
Atmospheric Chemistry ◽  
Tropical Rainforest ◽  
East Asian ◽  
Anthropogenic Pollution ◽  
Atmospheric Composition ◽  
Airborne Measurements ◽  
Photochemical Processes ◽  
Chemical Models ◽  
Modelling Strategies ◽  
Order Of Magnitude

Abstract. In April–July 2008, intensive measurements were made of atmospheric composition and chemistry in Sabah, Malaysia, as part of the "Oxidant and particle photochemical processes above a South-East Asian tropical rainforest" (OP3) project. Fluxes and concentrations of trace gases and particles were made from and above the rainforest canopy at the Bukit Atur Global Atmosphere Watch station and at the nearby Sabahmas oil palm plantation, using both ground-based and airborne measurements. Here, the measurement and modelling strategies used, the characteristics of the sites and an overview of data obtained are described. Composition measurements show that the rainforest site was not significantly impacted by anthropogenic pollution, and this is confirmed by satellite retrievals of NO2 and HCHO. The dominant modulators of atmospheric chemistry at the rainforest site were therefore emissions of BVOCs and soil emissions of reactive nitrogen oxides. At the observed BVOC:NOx volume mixing ratio (~100 pptv/pptv), current chemical models suggest that daytime maximum OH concentrations should be ca. 105 radicals cm−3, but observed OH concentrations were an order of magnitude greater than this. We confirm, therefore, previous measurements that suggest that an unexplained source of OH must exist above tropical rainforest and we continue to interrogate the data to find explanations for this.

Vertical variation in leaf gas exchange parameters for a Southeast Asian tropical rainforest in Peninsular Malaysia

2012 ◽  
Vol 125 (6) ◽  
pp. 735-748 ◽  
Author(s):  
Yoshiko Kosugi ◽  
Satoru Takanashi ◽  
Naoto Yokoyama ◽  
Elizabeth Philip ◽  
Mai Kamakura
Keyword(s):  
Gas Exchange ◽  
Tropical Rainforest ◽  
Leaf Gas Exchange ◽  
Southeast Asian ◽  
Peninsular Malaysia ◽  
Gas Exchange Parameters ◽  
Vertical Variation ◽  
Exchange Parameters

scholarly journals Not in the Least Concern: anthropogenic influences on a South-east Asian apple snail Pila scutata (Ampullariidae)

Oryx ◽  
2018 ◽  
Vol 53 (2) ◽  
pp. 230-238 ◽  
Author(s):  
Ting Hui Ng ◽  
Siong Kiat Tan ◽  
Amirrudin Ahmad ◽  
Do Van Tu ◽  
Ravindra C. Joshi ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
East Asian ◽  
Iucn Red List ◽  
Peninsular Malaysia ◽  
Red List ◽  
Taxonomic Resolution ◽  
Malay Peninsula ◽  
Apple Snail ◽  
Widespread Species ◽  
16S Sequencing

AbstractSouth-east Asian apple snails, Pila spp., have been declining since the introduction of globally invasive, confamilial South American Pomacea spp., yet Pila ecology remains poorly studied, with most occurrence records unconfirmed. Pila scutata, a previously widespread species, presumed native to the Malay peninsula and assessed as Least Concern in the IUCN Red List, was formerly harvested for food, and may have experienced anthropogenic translocations. We surveyed the Malay peninsula (specifically Peninsular Malaysia and Singapore) to investigate the current distribution and genetic diversity of P. scutata. Six populations were found in Singapore, but only one in Peninsular Malaysia. Mitochondrial COI and 16S sequencing revealed that the Malaysian population shared a single haplotype of both genes with the Singapore populations (500 km distant). This low genetic diversity could stem from a recent anthropogenic introduction, which brings into question the true native range of P. scutata and, coupled with poorly resolved taxonomy of the genus, necessitates a reassessment of its IUCN Red List status. Introduced populations pose a dilemma, and the lack of genetic diversity is of concern in light of Pila decline throughout South-east Asia. Our results highlight that conservation management of P. scutata and its congeners must therefore be better informed by greater taxonomic resolution and more comprehensive investigations of their ecology, both in native and introduced ranges.

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