Seasonal variations in litter production and its relation with MODIS vegetation indices in a semi-deciduous forest of Mato Grosso

Zeilhofer, Peter; Sanches, Luciana; Vourlitis, George L.; Andrade, Nara Luísa Reis de

doi:10.1080/01431161.2010.523025

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…Over seasonal timescales the highest rates of canopy photosynthesis and ecosystem respiration were observed in during the dry‐wet season transition in October‐December (Figure 6b). During this time, leaves from deciduous trees are rapidly expanding, causing a concomitant increase in LAI and leaf and canopy photosynthesis [ Hutyra et al , 2007; Sanches et al , 2008b; Zeilhofer et al , 2011], while litter that accumulates over the dry season [ Valentini et al , 2008] decomposes rapidly [ Sanches et al , 2008a] causing a large and rapid increase in ecosystem respiration [ Goulden et al , 2004; Vourlitis et al , 2004, 2005]. In contrast, the lowest rates of canopy photosynthesis and respiration were observed during the dry season (June‐August), when leaves are actively being shed by the canopy [ Sanches et al , 2008b; Zeilhofer et al , 2011] and leaf gas exchange [ Miranda et al , 2005; Sendall et al , 2009] and soil respiration [ Sotta et al , 2004; Valentini et al , 2008] are limited by low water availability.…”

Section: Discussionmentioning

confidence: 99%

“…While F GPP,opt was not found to be directly affected by average monthly temperature an interaction between water availability and temperature might explain the significantly lower F GPP,opt and canopy photosynthesis rates observed in 2005–2006. Assuming a threshold of 28°C [ Doughty and Goulden , 2008], air temperature exceeded this threshold more frequently in 2005–2006 than in other years, especially in September‐October during the dry‐wet season transition, when new leaves are rapidly expanding [ Sanches et al , 2008b; Zeilhofer et al , 2011], and in December‐February during the peak of the wet season (Figure 7a). Moreover, rates of F GPP,opt declined as the frequency in which temperature exceeded 28°C (Figure 7b).…”

Section: Discussionmentioning

confidence: 99%

“…Annual rates of litter production are 8–10 Mg ha −1 yr −1 , and forest floor litter mass ranges between 5 and 8 Mg ha −1 [ Sanches et al , 2008a]. Leaf litter production accounts for about 70% of the total litter production, and has a pronounced seasonal cycle with an annual maximum in July‐September [ Sanches et al , 2008a; Zeilhofer et al , 2011]. The soil is a quartzarenic neosol characterized by ≈90% sand, low pH (4.2), and low fertility [ Almeida , 2005].…”

Section: Methodsmentioning

confidence: 99%

“…However, varying sensor viewing geometry, cloud presence, aerosols and bidirectional reflectance can limit the efficacy of reflectance data for assessing spatiotemporal dynamics in biophysical processes [ Hird and McDermid , 2009], and signal extraction techniques are often needed to improve the signal‐noise ratio [ Hermance et al , 2007]. Thus, we applied Singular Spectrum Analysis [ Zeilhofer et al , 2011], which is particularly effective for the filtered reconstruction of short, irregularly spaced, and noisy time series [ Ghil et al , 2002; Golyandina and Osipova , 2007] to improve the signal‐noise ratio of the MODIS‐EVI.…”

Section: Methodsmentioning

confidence: 99%

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Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin

Vourlitis¹,

Lobo²,

Zeilhofer³

et al. 2011

J. Geophys. Res.

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The carbon cycling of tropical ecosystems has received considerable attention over the last 1–2 decades; however, interactions between climate variation and tropical forest net ecosystem CO2 exchange (NEE) are still uncertain. To reduce this uncertainty, and assess the biophysical controls on NEE, we used the eddy covariance method over a 3 year period (2005–2008) to measure the CO2 flux and energy balance for a 25–28 m tall, mature tropical semideciduous forest located near Sinop Mato Grosso, Brazil. The study period encompassed warm‐dry, cool‐wet, and cool‐dry climate conditions, and based on previous research, we hypothesized that the net CO2 accumulation of the semideciduous forest would be lower during periods of drought. Using time series of the enhanced vegetation index (EVI), a NEE‐light‐use model, and path analysis, we found that the estimated quantum yield (a′, μmol CO2μmol photons−1) was directly affected by temporal variations in the EVI, precipitation, and photosynthetically active radiation (PAR), while the optimal rate of gross primary production (FGPP,opt, μmol m−2 s−1) was directly affected by the EVI and PAR. However, indirect effects of precipitation on the a′ and FGPP,opt were stronger than direct effects because variations in precipitation also lead to variations in the EVI and the atmospheric vapor pressure deficit (VPD). Daytime ecosystem respiration (FRE,day, μmol m−2 s−1) was directly affected by temporal variations in temperature and VPD and indirect effects of other variables were of lesser importance. Net ecosystem CO2 uptake was often higher in the dry season than the wet season, not because of a dry season “green‐up” but because rates of ecosystem respiration declined relatively more than rates of canopy photosynthesis. Over interannual timescales, average daily NEE increased over the 3 year study period and was highest in 2007–2008, which was also the driest year in terms of rainfall. However, 2007–2008 was also the coolest year during the 3 year study period, and the low temperature appeared to compensate for the low rainfall. Overall, our data suggest that the NEE of tropical semideciduous forests is sensitive to temporal variations in surface water availability but that indirect effects of other variables, such as temperature and VPD, are important in controlling CO2 gain and loss. Such interactions will be important for the future NEE under warmer and drier conditions that are anticipated with anthropogenic climate change.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin

Vourlitis¹,

Lobo²,

Zeilhofer³

et al. 2011

J. Geophys. Res.

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“…At spatial scales (regional or worldwide), AGB and litter decay rates in TDFs will enhance with an increase in mean annual precipitation (Souza et al, 2019). Few studies reported that litter mass production synchronizes with canopy processes linked to phenology, vegetative, and reproductive growth phases and biomass production (Zeilhofer et al, 2012). The quantification of the litter production at higher temporal and spatial scales is cumbersome and restricts the development of the linkage between litter crop and complex canopy processes (Wang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Disentangling Forest Dynamics for Litter Biomass Production in a Biosphere Reserve in Central India

Thakur

Eripogu

Thakur

et al. 2022

Front. Environ. Sci.

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Investments in energy sources are scaling up across India to improve climate security and further mitigate future climate change. Forest biomass and litterfall pattern play an important role in the sustainable management of forests and the efficient utilization of resources. This study investigates the seasonal litterfall biomass pattern for five consecutive years (2015–2019) in four different vegetation types in Central India (AABR) using the litter traps method on the forest floor. An ANOVA model was adopted to infer the effects of forest types, litter types, and seasonality on litterfall production. The estimated mean litterfall of the dry tropical forest in Central India was recorded as 4.19 ± 0.305 Mg/ha/y where teak plantations contribute higher values compared to other studied vegetation types. A positive correlation was observed between the litterfall and nutrient storage with soil-adjusted vegetation index and other vegetation indices. The findings of litterfall pattern and turnover rate of nutrients indicated that the vegetation types of AABR have huge potential for carbon sequestration and help to achieve the Conference of the Parties (COP-26) goal of reducing regional and/or global climate change.

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Ground and remote sensing-based measurements of leaf area index in a transitional forest and seasonal flooded forest in Brazil

et al. 2013

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Leaf area index (LAI) is a key driver of forest productivity and evapotranspiration; however, it is a difficult and labor-intensive variable to measure, making its measurement impractical for large-scale and long-term studies of tropical forest structure and function. In contrast, satellite estimates of LAI have shown promise for large-scale and long-term studies, but their performance has been equivocal and the biases are not well known. We measured total, overstory, and understory LAI of an Amazon-savanna transitional forest (ASTF) over 3 years and a seasonal flooded forest (SFF) during 4 years using a light extinction method and two remote sensing methods (LAI MODIS product and the Landsat-METRIC method), with the objectives of (1) evaluating the performance of the remote sensing methods, and (2) understanding how total, overstory and understory LAI interact with micrometeorological variables. Total, overstory and understory LAI differed between both sites, with ASTF having higher LAI values than SFF, but neither site exhibited year-to-year variation in LAI despite large differences in meteorological variables. LAI values at the two sites have different patterns of correlation with micrometeorological variables. ASTF exhibited smaller seasonal variations in LAI than SFF. In contrast, SFF exhibited small changes in total LAI; however, dry season declines in overstory LAI were counteracted by understory increases in LAI. MODIS LAI correlated weakly to total LAI for SFF but not for ASTF, while METRIC LAI had no correlation to total LAI. However, MODIS LAI correlated strongly with overstory LAI for both sites, but had no correlation with understory LAI. Furthermore, LAI estimates based on canopy light extinction were correlated positively with seasonal variations in rainfall and soil water content and negatively with vapor pressure deficit and solar radiation; however, in some cases satellite-derived estimates of LAI exhibited no correlation with climate variables (METRIC LAI or MODIS LAI for ASTF). These data indicate that the satellite-derived estimates of LAI are insensitive to the understory variations in LAI that occur in many seasonal tropical forests and the micrometeorological variables that control seasonal variations in leaf phenology. While more ground-based measurements are needed to adequately quantify the performance of these satellite-based LAI products, our data indicate that their output must be interpreted with caution in seasonal tropical forests.

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Seasonal variations in litter production and its relation with MODIS vegetation indices in a semi-deciduous forest of Mato Grosso

Cited by 11 publications

References 23 publications

Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin

Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin

Disentangling Forest Dynamics for Litter Biomass Production in a Biosphere Reserve in Central India

Ground and remote sensing-based measurements of leaf area index in a transitional forest and seasonal flooded forest in Brazil

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Seasonal variations in litter production and its relation with MODIS vegetation indices in a semi-deciduous forest of Mato Grosso

Cited by 11 publications

References 23 publications

Temporal patterns of net CO2exchange for a tropical semideciduous forest of the southern Amazon Basin

Temporal patterns of net CO2exchange for a tropical semideciduous forest of the southern Amazon Basin

Disentangling Forest Dynamics for Litter Biomass Production in a Biosphere Reserve in Central India

Ground and remote sensing-based measurements of leaf area index in a transitional forest and seasonal flooded forest in Brazil

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Product

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Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin

Temporal patterns of net CO₂exchange for a tropical semideciduous forest of the southern Amazon Basin