Tropical forests and global change: filling knowledge gaps

Zuidema, Pieter A.; Baker, Patrick J.; Groenendijk, Peter; Schippers, Peter; Sleen, Peter van der; Vlam, Mart; Sterck, Frank J.

doi:10.1016/j.tplants.2013.05.006

Cited by 147 publications

(107 citation statements)

References 73 publications

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“…The study site covers an area of 2500 km 2 , from 14°44'20"N to 15°25'52"N latitude and from 105°42'7"E to 106°0'30"E longitude ( Figure 1). Comprehensive mapping of land cover types is not yet available for Laos, although monitoring of forest resources and land clearance is a high national priority, calling for development of suitable remote sensing approaches for land cover inventory and monitoring.…”

Section: Study Areamentioning

confidence: 99%

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MODIS EVI and LST Temporal Response for Discrimination of Tropical Land Covers

et al. 2015

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MODIS enhanced vegetation index (EVI) and land surface temperature (LST) are key indicators for monitoring vegetation cover changes in broad ecosystems. However, there has been little evaluation of these indices for detecting changes in a range of land covers in tropical regions. In this study, we investigated the characteristics and seasonal responses of LST and EVI for four different land covers in Lao tropical forests: native forest, rubber plantation, mixed wooded/cleared areas and agriculture. We calculated long-term averages of MODIS LST and EVI 16-day time series and compared their monthly transitions over the seven-year period from 2006 to 2012. We also tested whether these indices can be used to classify these four land covers. The findings demonstrate the complex interrelationship of LST and EVI and their monthly transitions for different land covers: they each showed distinctly different intra-annual LST and EVI variations. Native forests have the highest EVI, and the lowest LST throughout the year. In contrast, agricultural areas with little or no vegetation cover have the highest LST. The transition of LST/EVI for the land covers other than native forests showed marked seasonality. Linear discriminant analysis (LDA) showed that there was high overall accuracy of separation of land covers by these indices (86%). The encouraging results indicate that the combined use of MODIS LST and EVI holds promise for improving monitoring of changes in a Lao tropical forest. OPEN ACCESSRemote Sens. 2015, 7 6027

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Section: Study Areamentioning

confidence: 99%

“…Vegetation cover changes in tropical regions are among the most significant contributors to global climate change [1][2][3][4]. These changes have resulted in changes in carbon stock, land degradation and rapid loss of biodiversity [1].…”

Section: Introductionmentioning

confidence: 99%

MODIS EVI and LST Temporal Response for Discrimination of Tropical Land Covers

et al. 2015

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“…However, studies focusing on nutrient-induced modification of wood anatomical traits are quite sparse (Harvey and Van den Driessche, 1997;Hacke et al, 2010;Hacke, 2015) and completely lacking in tropical regions at this time (Zuidema et al, 2013). But how can those changes of the vascular system be detected or calculated?…”

Section: Introductionmentioning

confidence: 99%

Nutrient-Induced Modifications of Wood Anatomical Traits of Alchornea lojaensis (Euphorbiaceae)

2016

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Regarding woody plant responses on higher atmospheric inputs of the macronutrients nitrogen (N) and phosphorous (P) on tropical forests in the future, an adaptive modification of wood anatomical traits on the cellular level of woody plants is expected. As part of an interdisciplinary nutrient manipulation experiment (NUMEX) carried out in Southern Ecuador, we present here the first descriptive and quantitative wood anatomical analysis of the tropical evergreen tree species Alchornea lojaensis (Euphorbiaceae). We sampled branch wood of nine individual trees belonging to treatments with N fertilization, N+P fertilization, and a control group, respectively. Quantitative evaluations of eleven different vessel parameters were conducted. The results showed that this endemic tree species will be able to adapt well to the future effects of climate change and higher nutrient deposition. This was firstly implied by an increase in vessel diameter and consequently a higher theo. area-specific hydraulic conductivity with higher nutrient availability. Secondly, the percentage of small vessels (0-20 µm diameter) strongly increased with fertilization. Thirdly, the vessel arrangement (solitary vessels vs. multiple vessel groupings) changed toward a lower percentage of solitary vessel fraction (V S ), and concurrently toward a higher total vessel grouping index (V G ) and a higher mean group size of non-solitary vessels (V M ) after N and N+P addition. We conclude that higher nutrient availability of N and N+P triggered higher foliage amount and water demand, leading to higher cavitation risk in larger vessels. This is counteracted by a stronger grouping of vessels with smaller risk of cavitation to ensure water supply during drier periods that are expected to occur in higher frequency in the near future.

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“…In this study, we use a modeling approach in order to mechanistically link climate conditions and functional plant traits to tree growth and survival (Zuidema et al, 2013). Functional traits have been recently used to include functional diversity in models of tree growth Rüger et al, 2012;Wagner et al, 2014) and tree mortality .…”

Section: Introductionmentioning

confidence: 99%

Identifying climatic drivers of tropical forest dynamics

et al. 2015

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Abstract. In the context of climate change, identifying and then predicting the impacts of climatic drivers on tropical forest dynamics is becoming a matter of urgency. To look at these climate impacts, we used a coupled model of tropical tree growth and mortality, calibrated with forest dynamic data from the 20-year study site of Paracou, French Guiana, in order to introduce and test a set of climatic variables. Three major climatic drivers were identified through the variable selection procedure: drought, water saturation and temperature. Drought decreased annual growth and mortality rates, high precipitation increased mortality rates and high temperature decreased growth. Interactions between key functional traits, stature and climatic variables were investigated, showing best resistance to drought for trees with high wood density and for trees with small current diameters. Our results highlighted strong long-term impacts of climate variables on tropical forest dynamics, suggesting potential deep impacts of climate changes during the next century.

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Tropical forests and global change: filling knowledge gaps

Cited by 147 publications

References 73 publications

MODIS EVI and LST Temporal Response for Discrimination of Tropical Land Covers

MODIS EVI and LST Temporal Response for Discrimination of Tropical Land Covers

Nutrient-Induced Modifications of Wood Anatomical Traits of Alchornea lojaensis (Euphorbiaceae)

Identifying climatic drivers of tropical forest dynamics

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