Comparison of the Leaf Area Index (LAI) of Two Types of Dipterocarp Forest on the West Bank of the Mekong River, Cambodia

Ito, Emiko; Khorn, Saret; Lim, Sopheap; Pol, Sopheavuth; Tith, Bora; Pith, Phearak; Tani, Akihiro; Kanzaki, Mamoru; Kaneko, Takayuki; Okuda, Youichirou; Kabeya, Naoki; Nobuhiro, Tatsuhiko; Araki, Makoto

doi:10.1007/978-4-431-46503-4_19

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…However, the decline of EG, SEG, and BB in the rainy season from July-August (Figure 9a) in the TM images could be due to the minimal observations and high cloud contamination of TM [62]. A previous study found similar results that vegetation index profiles were drastically reduced to the lowest level during the heavy rainy season [98]. On the other hand, the OLI images had more observations across the entire phenology study and showed a realistic vegetation index frequency in both phenological seasons as compared with the TM images (Figure 9b).…”

Section: Discussionsupporting

confidence: 61%

Determination of Vegetation Thresholds for Assessing Land Use and Land Use Changes in Cambodia using the Google Earth Engine Cloud-Computing Platform

et al. 2019

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As more data and technologies become available, it is important that a simple method is developed for the assessment of land use changes because of the global need to understand the potential climate mitigation that could result from a reduction in deforestation and forest degradation in the tropics. Here, we determined the threshold values of vegetation types to classify land use categories in Cambodia through the analysis of phenological behaviors and the development of a robust phenology-based threshold classification (PBTC) method for the mapping and long-term monitoring of land cover changes. We accessed 2199 Landsat collections using Google Earth Engine (GEE) and applied the Enhanced Vegetation Index (EVI) and harmonic regression methods to identify phenological behaviors of land cover categories during the leaf-shedding phenology (LSP) and leaf-flushing phenology (LFS) seasons. We then generated 722 mean phenology EVI profiles for 12 major land cover categories and determined the threshold values for selected land cover categories in the mid-LSP season. The PBTC pixel-based classified map was validated using very high-resolution (VHR) imagery. We obtained a cumulative overall accuracy of more than 88% and a cumulative overall accuracy of the referenced forest cover of almost 85%. These high accuracy values suggest that the very first PBTC map can be useful for estimating the activity data, which are critically needed to assess land use changes and related carbon emissions under the Reducing Emissions from Deforestation and forest Degradation (REDD+) scheme. We found that GEE cloud-computing is an appropriate tool to use to access remote sensing big data at scale and at no cost.

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Section: Discussionsupporting

confidence: 61%

Determination of Vegetation Thresholds for Assessing Land Use and Land Use Changes in Cambodia using the Google Earth Engine Cloud-Computing Platform

et al. 2019

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“…In our study, canopy LAI in evergreen forests surpasses that of dry evergreen forests in Kampong Thom, Cambodia, while regrowth forests lie between those of 18-35-year tropical secondary forests in Costa Rica; however, cashew plantations exceed reported values in India (Ito et al, 2007;Clark et al, 2021;Kumaresh et al, 2023). The LAIC difference between the forests (EF and RF) and CP was significant due to CP management practices, resulting in a thin canopy with low LAIC.…”

Section: Lai and Fparcontrasting

confidence: 48%

“…In contrast, natural forests with their densely developed canopy have a high LAIC. Additionally, LAIC phenology followed the rainy and dry seasons, with peak values during the rainy season and low values during the dry season (Ito et al, 2007). During the dry season, reduced rainfall leads to less water availability for plant growth, causing plants to adapt to water stress by shedding their leaves, resulting in low LAIC in the ecosystem (Maréchaux et al, 2018).…”

Section: Lai and Fparmentioning

confidence: 99%

Ecosystem characteristics of land covers with various anthropogenic impacts in a tropical forest region of Southeast Asia

Sovann,

Tagesson,

Vestin

et al. 2024

Preprint

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Abstract. Given the severe anthropogenic pressure on tropical forests and the high demand for field observations of ecosystem characteristics, it is crucial to collect such data both in pristine tropical forests and in the converted deforested land cover classes. To gain insight into the ecosystem characteristics of pristine tropical forests, regrowth forests, and cashew plantations, we established an ecosystem monitoring site in Phnom Kulen National Park, Cambodia. Here, we present observed datasets of forest inventories, leaf area index, leaf traits of woody species, a fraction of intercepted photosynthetically active radiation, and edaphic and meteorological conditions. We examined how land-use and land-cover change affect species and functional diversity, stand structure, and edaphic conditions among the three land-cover classes. We further investigated relationships between diameters at breast height and tree height, estimated aboveground biomass (AGB), and explored relationships between ecosystem characteristics and AGB. We uncovered some key differences in ecosystem characteristics among the land-cover classes. We also demonstrated the feasibility of locally updating AGB estimates using power law functions. These datasets and findings can contribute to filling data gaps in tropical forest research, addressing global environmental challenges, and supporting sustainable forest management.

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“…In fact, for a dry dipterocarp forest, Rundel and Boonpragob (1995) stated that new leaves begin forming before the end of the dry season. Furthermore, Ito et al (2007) reported no clear seasonal change in LAI at a Cambodian dry dipterocarp forest, probably because the study area is located in a mesic site. In addition, Elliot et al (2006) observed the patterns of leaf flushing and shedding for various deciduous tree species, reporting that spring flushing of deciduous trees was more common in this region; flushing was induced around the spring equinox by increasing day length.…”

Section: Responses To Inter-annual Variation In Rainfallmentioning

confidence: 89%

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

Tanaka

Kume

Yoshifuji

et al. 2008

Agricultural and Forest Meteorology

107

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Comparison of the Leaf Area Index (LAI) of Two Types of Dipterocarp Forest on the West Bank of the Mekong River, Cambodia

Cited by 7 publications

References 21 publications

Determination of Vegetation Thresholds for Assessing Land Use and Land Use Changes in Cambodia using the Google Earth Engine Cloud-Computing Platform

Determination of Vegetation Thresholds for Assessing Land Use and Land Use Changes in Cambodia using the Google Earth Engine Cloud-Computing Platform

Ecosystem characteristics of land covers with various anthropogenic impacts in a tropical forest region of Southeast Asia

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

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