Importance of phenological observations and predictions in agriculture

Ruml, M.; Vulić, Todor

doi:10.2298/jas0502217r

Cited by 37 publications

(24 citation statements)

References 13 publications

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“…Air temperature is considered a dominant factor in foliar pigment biosynthesis, controlling the timing of the phenophases (Ruml & Vulić, 2005). To function, assimilatory pigments need light and moderate temperature (Creasy & Creasy, 2009).…”

Section: Relationships With the Environmentmentioning

confidence: 99%

Quantitative Investigation of Leaf Photosynthetic Pigments during Annual Biological Cycle of Vitis vinifera L. Table Grape Cultivars

Filimon¹,

Rotaru²,

Filimon

2016

SAJEV

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Variations in chlorophyll a/b and chlorophyll/carotenoid ratios are indicators of senescence, stress or damage to the photosynthetic apparatus and affect the normal course of plant biological processes. The aim of this work was to investigate the chlorophyll (a and b) and carotenoid content and ratios in the leaves of four Vitis vinifera L. table grape cultivars in the main phenophases of the annual biological cycle. During the annual cycle, the moisture content of the leaves decreased significantly (up to 21%), along with a reduction in leaf area and perimeter. Chlorophyll a and b showed a continuous accumulation until grape véraison, with lower values of the Chl a/b ratio at the beginning of the vegetative period. Carotenoids continued their biosynthesis until grape ripening (for another 30 days), at which stage there was a significant decrease in the chlorophyll/carotenoid ratio (2.62 ± 0.31). At véraison, peroxidase had the most intense activity (0.20 to 0.51 U/mg), possibly because of involvement in chlorophyll degradation, while total phenolic content started to decrease. Grape véraison could be regarded as the starting point of foliage senescence. Moreover, the relationship between total chlorophyll (by extraction) and chlorophyll content index (non-destructive method) was very significant (R 2 = 0.92). These results contribute to a better understanding of foliar pigment dynamics and the timing of their decline in order to define the behaviour of table grape cultivars during the annual biological cycle. INTRODUCTIONThe annual life cycle of grapevines is a process that takes place in the vineyard each year, beginning with bud burst in the spring and culminating with leaf fall in autumn, followed by winter dormancy (Creasy & Creasy, 2009). The annual life cycle comprises all morphological and biological changes with a periodic character through which the grapevine passes in a calendar year. These changes are called phenological stages (phenophases) and have a specific starting and ending time and a hereditary character (Wang et al., 2014). The occurrence and duration of phenological phases is influenced by climatic factors, and it should be noted that, under the same climatic conditions, the annual life cycle varies by cultivar (Jones & Davis, 2000). In the temperate continental climate, the annual cycle of grapevines lasts about 160 to 220 days.Chlorophylls (Chl) are probably the most important organic compounds on earth, as they are required for photosynthesis (Davies, 2004;Willows, 2004). Photosynthesis in plants is dependent upon capturing light energy in the pigment chlorophyll, and in particular chlorophyll a (Blankenship, 2014). Photosynthetic activity is a very intense process (5 to 11 μmol CO 2 /m 2 /s) that provides all the organic material needed for the growth and life activity of the plant (Popescu & Popescu, 2014). This is why photosynthesising cells have to contain large amounts of assimilatory pigments (up to 5% of total dry solids; Rabinowitch & Govindjee, 1969). In most species, the photos...

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Section: Relationships With the Environmentmentioning

confidence: 99%

Quantitative Investigation of Leaf Photosynthetic Pigments during Annual Biological Cycle of Vitis vinifera L. Table Grape Cultivars

Filimon¹,

Rotaru²,

Filimon

2016

SAJEV

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“…In recent years, many studies have focused on them because of their importance as reservoirs for rare species, in many cases endemic (Biggs et al 2005), and because they are highly vulnerable to climate change. These environments represent unique areas and are used as sentinel systems (De Meester et al 2005) to detect and assess global warming and its consequences, since climate changes rapidly with height over relatively short horizontal distances (Ruml and Vulić 2005). Thus, high-altitude wetlands are ideal as model systems because of their small size, simple community structure and low taxonomic richness (De Meester et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Phenological studies may provide key information to understand the effects of climate change on ecology, forestry, agriculture and human health (Van Vliet and Schwartz 2002), for they reflect shifts in the timing of different phenological phases (Ruml and Vulić 2005). Very few studies have been performed analyzing temporal variations in macroinvertebrate communities in temporary and permanent ponds (Scheibler and Ciocco 2011;Mereta et al 2012;Fontanarrosa et al 2013;Karaouzas et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Abundance, Richness, Seasonal and Altitudinal Dynamics of Aquatic True Bugs (Heteroptera) in Mountain Wetlands of Argentina

et al. 2016

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Mountain wetlands provide unique information because their biota is highly specific and contributes significantly to regional diversity. The goals of this study were assessing altitudinal and temporal variation in the distribution of Heteropteran assemblages in mountain wetlands; and studying the phenology of the most abundant species. All stages of Heteroptera and data on environmental variables were collected monthly over one year from five mountain wetlands. A simple community structure, and also a low richness of aquatic true bugs, composed of four Heteropteran families (C o r i x i d a e , B e l o s t o m a t i d a e , N o t o n e c t i d a e a n d Gelastocoridae), characterized our ponds. Richness and abundance varied temporally and spatially (p < 0.0001); and increased at higher elevations. Additionally, the highest abundance of cold stenothermal species occurred at the highest altitudes where harsh conditions are prevalent. Ectemnostega (E.) quadrata and S. (T.) jensenhaarupi, both endemic to the Andes region, were the most abundant species. Both these species showed univoltine cycles and overwintered as adults. Biodiversity of the Heteroptera reached maximum values in summer when water temperature increased. Temporal and spatial monitoring studies provide key information on the distribution, diversity, and habitat requirements of Heteropteran species as well as on conservation and management of these vulnerable habitats and species which are faced with climate warming.

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“…To facilitate the water resource management and yield estimation of winter wheat in the NCP, the observations and models of winter wheat phenology are extensively required [5]. For example, measurements of the key phenological events, including green-up date (GUD), heading date (HD), and maturity date (MD), are necessary for computing the water demand of winter wheat throughout the growing season [6].…”

Section: Introductionmentioning

confidence: 99%

Interactions among the Phenological Events of Winter Wheat in the North China Plain-Based on Field Data and Improved MODIS Estimation

Yang

Wang

et al. 2019

Remote Sensing

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Identification of complete drivers for phenology changes is crucial for developing prediction models of plant phenology. In addition to climatic factors, the interaction among phenological events has recently been reported as an important driver for the phenology changes of forests, savannas, and grasslands. However, open questions remain as to whether the phenological interaction exists in agricultural ecosystems, among which winter wheat plays a vital role in feeding human beings. In this study, we investigated the interaction among the phenological events of winter wheat in the North China Plain (NCP) using both field and satellite data. Considering the large discrepancies between the existing satellite estimation and field measurements of winter wheat phenology, we first improved the MODIS-based estimation of green-up date (GUD), heading date (HD), and maturity date (MD) through a re-calibrated relative threshold method (RTM) in the NCP. The GUD, HD, and MD were accurately estimated with the mean absolute errors (MAE) and root mean squared errors (RMSE) lower than 7.5 days, compared with the RMSEs ranging from 12.0 to 36.1 days in previous studies. Then, the relationships among the GUD, HD, and MD were analyzed using the field data collected at agricultural meteorological stations. The GUD (HD) showed a significantly positive correlation with the HD (MD). Quantitatively, a one-day earlier GUD (HD) would result in an earlier HD (MD) of 0.57 days (0.60 days). Furthermore, we applied the partial correlation analysis to the improved MODIS estimation of GUD, HD, and MD to investigate their interactions by considering the simultaneous influences from climatic factors. The results showed that the HD (MD) with 85.2% (94.5%) of all winter wheat pixels presented a significantly positive correlation with the GUD (HD). Meanwhile, the GUD (HD) with 84.2% (33.3%) of the entire winter wheat area presented a significantly negative correlation with pre-season temperature. These results suggest that both the climatic factors and phenological interactions should be included in the future development of winter wheat phenology models to improve the prediction accuracies. on NDVI, a novel snow-free type of VIs, including the empirical normalized difference phenology index (NDPI,[27]) and the semi-analytical normalized difference greenness index (NDGI,[26]), were recently proposed. Based on the time-series of the computed VIs, vegetation phenology can be estimated by extracting the day of year (DOY) corresponding to pre-determined absolute or relative thresholds of the VI values [1,15] or the maximum change rate of the trajectories of VIs [11,28]. For winter wheat, the GUDs were previously estimated based on either a relative threshold of 20% or a maximum change rate of the fitted curve of the time series VIs [1,2,10,11]. These studies mainly focused on changing trends of winter wheat phenology and its responses to climatic factors from the perspective of regarding the wheat fields as important agricultural ecosystems to the global...

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Importance of phenological observations and predictions in agriculture

Cited by 37 publications

References 13 publications

Quantitative Investigation of Leaf Photosynthetic Pigments during Annual Biological Cycle of Vitis vinifera L. Table Grape Cultivars

Quantitative Investigation of Leaf Photosynthetic Pigments during Annual Biological Cycle of Vitis vinifera L. Table Grape Cultivars

Abundance, Richness, Seasonal and Altitudinal Dynamics of Aquatic True Bugs (Heteroptera) in Mountain Wetlands of Argentina

Interactions among the Phenological Events of Winter Wheat in the North China Plain-Based on Field Data and Improved MODIS Estimation

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