scholarly journals An overview of the phenological observation network and the phenological database of Germany's national meteorological service (Deutscher Wetterdienst)

2015 ◽  
Vol 11 (1) ◽  
pp. 93-99 ◽  
Author(s):  
F. Kaspar ◽  
K. Zimmermann ◽  
C. Polte-Rudolf

Abstract. First phenological observations have been performed in Germany already in the 18th century. The onset dates of characteristic phases of plant development (phenological phases) are observed and recorded. Today, Germany's national meteorological service (Deutscher Wetterdienst, DWD) maintains a dense phenological observation network and a database with phenological observations. The data are used in many applications, esp. for advisory activities to agriculture or pollen dispersion information.

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Huanjiong Wang ◽  
Junhu Dai ◽  
Quansheng Ge

Continuous satellite datasets are widely used in tracking vegetation responses to climate variability. Start of season (SOS), for example, can be derived using a number of methods from the time series of satellite reflectance data; however, various methods often produce different SOS measures which limit the application of satellite data in phenological studies. Therefore, we employed five methods to estimate SOS from the Advanced Very High Resolution Radiometer (AVHRR)/normalized difference vegetation index (NDVI) dataset. Subsequently, we compared the SOS with the ground-based first leaf date (FLD) of 12 deciduous broadleaved plant species at 12 sites of the Chinese Phenological Observation Network (CPON). The results show that the latitudinal patterns of five satellite-derived SOS measures are similar to each other but different from the pattern of ground phenology. For individual methods, the variability of SOS time series is significantly different from ground phenology except for HANTS, Polyfit, and Midpoint methods. The SOS calculated using the Midpoint method showed significant correlations with ground phenophases most frequently (in 47.1% of cases). Using the SOS derived from the Midpoint method, significantly earlier trends in SOS were detected in 50.7% of the natural vegetation area from 1982 to 2006.


2015 ◽  
Vol 10 (2) ◽  
pp. 156-160
Author(s):  
Гайсин ◽  
Ilshat Gaysin ◽  
Тихонова ◽  
Mariya Tikhonova ◽  
Шаронова ◽  
...  

Pretreatment of tubers by ZhUSS drugs have a pronounced positive effect on the acceleration of phenological phases timing of development for 2-3 days, compared to the control. The use of chelated microelements contributed to the increase of leaf area in all phases of plant development: in case of ZhUSS-1 - to 3.0-32.8%, in case of ZhUSS-2 - to10.2-42.5%, as compared with the control. The best productivity rate was noted in ZhUSS-2 embodiment - 24.2 tons per hectare in combination with preplant foliar in concentration of 0.1%. Pre-treatment of tubers by ZhUSS drugs contributed to the growth of tuber starch up to 14.0%, the marketability of products up to 95%.


2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Fengyi Zheng ◽  
Zexing Tao ◽  
Yachen Liu ◽  
Yunjia Xu ◽  
Junhu Dai ◽  
...  

Based on the phenological data from China Phenological Observation Network, we compiled the phenological calendars of 3 phenological observation stations (Shanghai, Nanjing, and Hefei) in East China for 1987–1996 and 2003–2012 according to the sequences of mean phenophases. We calculated the correlated coefficient and the root mean square error (RMSE) between phenophases and the beginning of meteorological seasons to determine the beginning date of phenological season. By comparing new phenological calendars with the old ones, we discussed the variation of phenophases and their responses to temperature. The conclusions are as follows. (1) The beginning dates of spring and summer advanced, while those of autumn and winter delayed. Thus, summers got longer and winters got shorter. (2) The beginning time of the four phenological seasons was advancing during 1987–1996, while it was delaying during 2003–2012. (3) Most spring and summer phenophases occur earlier and most autumn and winter phenophases occur later in 2003–2012 than in 1987–1996. (4) The beginning time of phenological seasons was significantly correlated with temperature. The phenological sensitivities to temperature ranged from −6.49 to −6.55 days/°C in spring, −3.65 to −5.02 days/°C in summer, 8.13 to 10.27 days/°C in autumn, and 4.76 to 10.00 days/°C in winter.


GCdataPR ◽  
2020 ◽  
Author(s):  
Quansheng GE ◽  
Junhu DAI ◽  
Haolong LIU ◽  
Qiongyao XU ◽  
Huanjiong WANG

2003 ◽  
Vol 154 (8) ◽  
pp. 333-339 ◽  
Author(s):  
Claudio Defila

Statistical analyses were carried out using data from 25 phenological observation stations in the Grisons and 17 chosen phenological phases between 1951 and 1998. Results show a wide scattering of phenological data depending on both time and location. The variation is attributable to climate differences in the different regions (Rheinbünden, Südbünden and Engadin), as well as differences of altitude (between 580 and 1805 m.a.s.l.) in the Canton. Trend analyses of 100 phenological time series during the period in question show, above all, a precocious tendancy in the Grisons. In contrast to the evaluation for the whole of Switzerland all phenophase species(including autumnal phases) show a precocious trend which reaches a peak at 22 days in full blossom. This early start of the vegetation period is cleary linked to climate change, as the start of phenological phases in spring are strongly influenced by temperature. Generally speaking, precocity in the Grisons is more accentuated than in the rest of Switzerland. This is a persuasive result in view of the fact that plants at the higher stations react more strongly to climate warming than those in the lowlands or in milder regions and many of the observation stations in the Grisons are situated at alpine altitudes, i.e., over 1000 m.a.s.l.


Author(s):  
N. Yu. Adamtsevich ◽  
A. V. Feskova ◽  
V. V. Titok ◽  
V. S. Boltovskiy

The dynamics of accumulation of flavonoids in the leaves of the littlewale (Lithospermum officinale L.) of the second year of cultivation in various phenological phases was studied. The maximum content of flavonoids was observed during the flowering phase. It was shown that the qualitative composition of the extracts of the leaves of the common sparrow in different phenological phases was changed insignificantly. At each stage of plant development, the flavonoid isoquercitrin was identified, the maximum amount of which was observed in the flowering phase.A comparative assessment of the elemental composition of the leaves of the littlewale is carried out, depending on the phenological phase. The quantitative content of 11 macro- and microelements has been determined. A high content of calcium, potassium and silicon was noted in each phase of plant development.


2017 ◽  
Vol 13 (4) ◽  
pp. 13-21
Author(s):  
Sh M Khapizov ◽  
M G Shekhmagomedov

The article is devoted to the study of inscriptions on the gravestones of Haji Ibrahim al-Uradi, his father, brothers and other relatives. The information revealed during the translation of these inscriptions allows one to date important events from the history of Highland Dagestan. Also we can reconsider the look at some important events from the past of Hidatl. Epitaphs are interesting in and of themselves, as historical and cultural monuments that needed to be studied and attributed. Research of epigraphy data monuments clarifies periodization medieval epitaphs mountain Dagestan using record templates and features of the Arabic script. We see the study of medieval epigraphy as one of the important tasks of contemporary Caucasian studies facing Dagestani researchers. Given the relatively weak illumination of the picture of events of that period in historical sources, comprehensive work in this direction can fill gaps in our knowledge of the medieval history of Dagestan. In addition, these epigraphs are of great importance for researchers of onomastics, linguistics, the history of culture and religion of Dagestan. The authors managed to clarify the date of death of Ibrahim-Haji al-Uradi, as well as his two sons. These data, the attraction of written sources and legends allowed the reconstruction of the events of the second half of the 18th century. For example, because of the epidemic of plague and the death of most of the population of Hidatl, this society noticeably weakened and could no longer maintain its influence on Akhvakh. The attraction of memorable records allowed us to specify the dates of the Ibrahim-Haji pilgrimage to Mecca and Medina, as well as the route through which he traveled to these cities.


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