Is the dry season an important driver of phenology and growth for two Brazilian savanna tree species with contrasting leaf habits?

Dalmolin, Ândrea Carla; Lobo, Francisco de Almeida; Vourlitis, George L.; Silva, Priscila Russani; Dalmagro, Higo J.; Antunes, M. Z.; Ortiz, Carmen Eugênia Rodríguez

doi:10.1007/s11258-014-0445-5

Cited by 52 publications

(48 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The dry season decline in the EVI appeared to begin prior to the onset of the dry season even though the largest declines occurred during the dry season; however, in each year of the field study the EVI exhibited a rapid increase at the end of the dry season (Figure a). These dynamics are driven by seasonal patterns in tree leaf phenology, which in turn are driven by seasonal variations in rainfall and soil water availability [ Ratana et al ., ; Dalmolin et al , ]. Leaf abscission of the primary tree species at the study site typically occurs immediately before the onset of the dry season [ Dalmolin et al , ] and is thought to be an adaptation against eventual high rates of dry season water loss [ Jackson et al ., ; Franco , ; Bucci et al ., ; Ratana et al ., ].…”

Section: Resultsmentioning

confidence: 99%

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

et al. 2016

Self Cite

View full text Add to dashboard Cite

The savanna vegetation of Brazil (Cerrado) accounts for 20–25% of the land cover of Brazil and is the second largest ecosystem following Amazonian forest; however, Cerrado mass and energy exchange is still highly uncertain. We used eddy covariance to measure the net ecosystem CO2 exchange (NEE) of grass‐dominated Cerrado (campo sujo) over 3 years. We hypothesized that soil water availability would be a key control over the seasonal and interannual variations in NEE. Multiple regression indicated that gross primary production (GPP) was positively correlated (Pearson's r = 0.69; p < 0.001) with soil water content, radiation, and the Moderate Resolution Imaging Spectroradiometer (MODIS)‐derived enhanced vegetation index (EVI) but negatively correlated with the vapor pressure deficit (VPD), indicating that drier conditions increased water limitations on GPP. Similarly, ecosystem respiration (Reco) was positively correlated (Pearson's r = 0.78; p < 0.001) with the EVI, radiation, soil water content, and temperature but slightly negatively correlated with rainfall and the VPD. While the NEE responded rapidly to temporal variations in soil water availability, the grass‐dominated Cerrado stand was a net source of CO2 to the atmosphere during the study period, which was drier compared to the long‐term average rainfall. Cumulative NEE was approximately 842 gC m−2, varying from 357 gC m−2 in 2011 to 242 gC m−2 in 2012. Our results indicate that grass‐dominated Cerrado may be an important regional CO2 source in response to the warming and drying that is expected to occur in the southern Amazon Basin under climate change.

show abstract

Section: Resultsmentioning

confidence: 99%

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, for other vegetation types, the response of SOS to precipitation was not so uniform. Such impact of precipitation on SOS in water-limited ecosystems can be anticipated because rainfall cues plant growth and development in arid and semiarid regions over the year [58][59][60].…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Variability in Start and End of Growing Season in China Related to Climate Variability

Dai

Cui

et al. 2016

Remote Sensing

View full text Add to dashboard Cite

Satellite-derived vegetation phenophases are frequently used to study the response of ecosystems to climate change. However, limited studies have identified the common phenological variability across different climate and vegetation zones. Using NOAA/Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) dataset, we estimated start of growing season (SOS) and end of growing season (EOS) for Chinese vegetation during the period 1982-2012 based on the Midpoint method. Subsequently, the empirical orthogonal function (EOF) analysis was applied to extract the main patterns of phenophases and their annual variability. The impact of climate parameters such as temperature and precipitation on phenophases was investigated using canonical correlation analysis (CCA). The first EOF mode of phenophases exhibited widespread earlier or later SOS and EOS signals for almost the whole country. The attendant time coefficients revealed an earlier SOS between 1996 and 2008, but a later SOS in 1982-1995 and 2009-2012. Regarding EOS, it was clearly happening later in recent years, mainly after 1993. The preseason temperature contributed to such spatiotemporal phenological change significantly. The first pair of CCA patterns for phenology and preseason temperature was found to be similar and its time coefficients were highly correlated to each other (correlation coefficient >0.7). These results indicate that there is a substantial amount of common variance in SOS and EOS across different vegetation types that is related to large-scale modes of climate variability.

show abstract

“…, Dalmolin et al . ). Others, however, have found negative correlations between leaf fall and precipitation (Munhoz & Felfili , Pirani et al .…”

mentioning

confidence: 97%

“…Few studies have addressed leaf exchange patterns in cerrado communities (Miranda 1995, Munhoz & Felfili 2005, Lenza & Klink 2006, Pirani et al 2009, Alberton et al 2014. Most of them either focused on reproductive phenophases or in describing general aspects of the community phenology, providing only inferences about the relationship between leafing patterns and environmental cues (e.g., Mantovani & Martins 1988, Batalha et al 1997, Batalha & Mantovani 2000, Bulhão & Figueiredo 2002, Batalha & Martins 2004, Damascos et al 2005, Tannus et al 2006, Dalmolin et al 2015. Others, however, have found negative correlations between leaf fall and precipitation (Munhoz & Felfili 2005, Pirani et al 2009).…”

mentioning

confidence: 99%

Leafing patterns and leaf exchange strategies of a cerrado woody community

et al. 2018

View full text Add to dashboard Cite

The deciduousness of tropical trees and communities depend on ecosystems characteristics such as plant species diversity, and strength of the dry season. Based on seven years of phenological observations, we provide the first long‐term description of leafing patterns of a woody cerrado community, aiming to investigate (1) the leaf exchange strategies considering the interannual variation in the degree of deciduousness of individuals and species and quantify the community deciduousness; (2) the relationship between interannual patterns of leaf fall and leaf flush according to the species’ leaf exchange strategies and climate; (3) the onset of cerrado growing season and its relation to climate seasonality. To detect seasonality and leafing onset we applied circular statistics and to understand the relationships between environmental predictors and leaf exchange strategies, we used generalized additive models. From 106 species observed, we classified 69 as deciduous (26 species), semi‐deciduous (25) or evergreen (18) and defined the studied cerrado as a semi‐deciduous vegetation. Leaf phenology was markedly seasonal and similar among years. Leaf fall peaked in the dry season, and leaf flush in the dry‐to‐wet transition. Leaf fall patterns related to temperature and leaf flush to day length and rainfall. Semi‐deciduous and deciduous species were more constrained by climate than the evergreen ones. The cerrado growing season started in the dry‐to‐wet season transition. Interannual variations in rainfall and temperature affected the individuals’ and, consequently, species’ degree of deciduousness, highlighting individual and species variability, and suggesting that cerrado leafing patterns are likely susceptible to future climate change scenarios.

show abstract

Is the dry season an important driver of phenology and growth for two Brazilian savanna tree species with contrasting leaf habits?

Cited by 52 publications

References 53 publications

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

Spatiotemporal Variability in Start and End of Growing Season in China Related to Climate Variability

Leafing patterns and leaf exchange strategies of a cerrado woody community

Contact Info

Product

Resources

About

Is the dry season an important driver of phenology and growth for two Brazilian savanna tree species with contrasting leaf habits?

Cited by 52 publications

References 53 publications

Large net CO2 loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

Large net CO2 loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

Spatiotemporal Variability in Start and End of Growing Season in China Related to Climate Variability

Leafing patterns and leaf exchange strategies of a cerrado woody community

Contact Info

Product

Resources

About

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought

Large net CO₂ loss from a grass‐dominated tropical savanna in south‐central Brazil in response to seasonal and interannual drought