Leaf area index of Caatinga biome and its relationship with hydrological and spectral variables

Almeida, Cicero Lima de; Carvalho, Thayslan Renato Anchiêta de; Araújo, José Carlos de

doi:10.1016/j.agrformet.2019.107705

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…We assessed the development of vegetation during the study period through photographic records (Figure 3) taken with a NIKON D7200 SRLD camera, always at the same location and at the same position (height and angle). The association of vegetation aspect (from photographs) and density was supported by the study developed by [41] for the Caatinga vegetation, and applied with the same goal by [5] in our study site. The canopy density was used as a proxy to LAI to separate the different stages of canopy development and evaluate the role of vegetation in the redistribution of rainfall particles in the throughfall.…”

Section: Canopy Development Stagessupporting

confidence: 52%

Canopy Effects on Rainfall Partition and Throughfall Drop Size Distribution in a Tropical Dry Forest

et al. 2022

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The energy distribution of natural rainfall droplets at different stages of canopy development in low-latitude semi-arid environments is still understudied. We assessed relationships between canopy development, gross rainfall (P) and throughfall (TF) characteristics in a tropical dry forest (TDF) with a total of 95 events of natural rain during December 2019–July 2021, in Northeast Brazil. One disdrometer was installed in an open field to record the gross rainfall and another under the deciduous vegetation canopy to record the throughfall. At the onset of the rainy season with a low leaf density, a larger fraction of rainfall was converted into throughfall, which declines as the leaf density increases. For events higher than 3 mm, the number of TF drops was always higher than that of P and with smaller diameters, regardless of the stage of canopy development, which indicates fragmenting of the rain drops by the vegetation canopy. The insights of this study are useful to quantify the impact of canopy development stages of a TDF on the characteristics of rainfall reaching the soil forest. Since those characteristics affect the water balance and soil erosion at the hillslope scale, the information provided is crucial for water and soil management.

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Section: Canopy Development Stagessupporting

confidence: 52%

Canopy Effects on Rainfall Partition and Throughfall Drop Size Distribution in a Tropical Dry Forest

et al. 2022

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“…We showed that the positive effect of plant cover on multifunctionality is also evident at the local scale, in locations subject to the same environmental conditions. Plant cover can ameliorate stressful conditions in areas that are susceptible to droughts because it influences local factors that are essential to ecosystem functioning in drylands (de Almeida et al, 2019). The positive relationship between soil moisture and vegetation, for example, is stronger in drier than in wetter ecosystems (D'Odorico et al, 2007).…”

Section: Discussion'mentioning

confidence: 99%

Loss of plant cover mediates the negative effect of anthropogenic disturbance on the multifunctionality of a dryland

Manhães

Mazzochini

Marinho

et al. 2022

Applied Vegetation Science

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Aims Anthropogenic disturbances due to human economic activities may affect ecosystem services, which are the benefits provided by the ecosystem properties, such as soil water content and soil fertility. Also, these disturbances affect plant community biodiversity and cover, which are also known to affect multiple ecosystem properties. However, the strength of the relative effects of the disturbance itself and of the effect that is mediated by changes in the plant community is still unclear. Questions We evaluated the relative direct and indirect effects (mediated by changes in the plant community) of the anthropogenic disturbances on ecosystem multifunctionality. Location Dry forests within the Sustainable Development Reserve Ponta do Tubarão, northeastern Brazil. Methods We measured standing biomass, litter mass, soil fertility and soil water content in 52 vegetation plots along a gradient of anthropogenic disturbance. Also, we measured woody plant cover and species’ functional traits to characterize the plant community functional structure. We measured livestock grazing, selective logging and past clear‐cuts as proxies of anthropogenic disturbance to create an index that characterizes the additive effect of these human activities. By building a theoretical model using the structural equation modelling approach, we investigated how the plant community changes in cover and biodiversity due to anthropogenic disturbances mediate changes in ecosystem properties. Results Our results show that anthropogenic disturbances had negative effects on ecosystem properties. Plant cover loss caused by anthropogenic disturbances was the major determinant of the negative effect of disturbances. The functional structure of the plant community had a weak effect on these properties. Conclusions By assessing the effect of human activities on multifunctionality, we found a stronger negative effect of anthropogenic disturbances when compared to its effect on single ecosystem properties. The recovery of plant cover should be a major focus of projects aiming to restore and maintain the multifunctionality of this dryland.

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“…In large areas (like in present study), remote sensing-based vegetation indices (VI) are a key tool for this purpose. VI that make uses red and near infrared wavelengths in their calculations, such as the EVI, are very sensitivity to plant leaf area [92][93][94] and photosynthetic pigments [95][96][97] variations, which in turn, can be strongly affected by drought, heat, and excessive irradiance. In this sense, using the EVI conilon plantations is particularly useful to reflect some possible physiological disorders caused by drought and heat, for instance, fall of leaves, pigment degradation, and limited nutrient absorption capacity.…”

Section: Detection Of the Drought And Heat Effects Over Coffee Plantamentioning

confidence: 99%

Impact of drought associated with high temperatures on Coffea canephora plantations: a case study in Espírito Santo State, Brazil

Venâncio

Filgueiras

Mantovani

et al. 2020

Sci Rep

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Droughts are major natural disasters that affect many parts of the world all years and recently affected one of the major conilon coffee-producing regions of the world in state of Espírito Santo, which caused a huge crisis in the sector. Therefore, the objective of this study was to conduct an analysis with technical-scientific basis of the real impact of drought associated with high temperatures and irradiances on the conilon coffee (Coffea canephora Pierre ex Froehner) plantations located in the north, northwest, and northeast regions of the state of Espírito Santo, Brazil. Data from 2010 to 2016 of rainfall, air temperature, production, yield, planted area and surface remote sensing were obtained from different sources, statistically analyzed, and correlated. The 2015/2016 season was the most affected by the drought and high temperatures (mean annual above 26 °C) because, in addition to the adverse weather conditions, coffee plants were already damaged by the climatic conditions of the previous season. The increase in air temperature has higher impact (negative) on production than the decrease in annual precipitation. The average annual air temperatures in the two harvest seasons that stood out for the lowest yields (i.e. 2012/2013 and 2015/2016) were approximately 1 °C higher than in the previous seasons. In addition, in the 2015/2016 season, the average annual air temperature was the highest in the entire series. The spatial and temporal distribution of Enhanced Vegetation Index values enabled the detection and perception of droughts in the conilon coffee-producing regions of Espírito Santo. The rainfall volume accumulated in the periods from September to December and from April to August are the ones that most affect coffee yield. The conilon coffee plantations in these regions are susceptible to new climate extremes, as they continue to be managed under irrigation and full sun. The adoption of agroforestry systems and construction of small reservoirs can be useful to alleviate these climate effects, reducing the risk of coffee production losses and contributing to the sustainability of crops in Espírito Santo.

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Leaf area index of Caatinga biome and its relationship with hydrological and spectral variables

Cited by 21 publications

References 36 publications

Canopy Effects on Rainfall Partition and Throughfall Drop Size Distribution in a Tropical Dry Forest

Canopy Effects on Rainfall Partition and Throughfall Drop Size Distribution in a Tropical Dry Forest

Loss of plant cover mediates the negative effect of anthropogenic disturbance on the multifunctionality of a dryland

Impact of drought associated with high temperatures on Coffea canephora plantations: a case study in Espírito Santo State, Brazil

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