Agrometeorological drought in the Romanian plain within the sector delimited by the valleys of the Olt and Buzău Rivers
© Murarescu et al.; licensee BioMed Central. 2014
Received: 20 November 2013
Accepted: 14 December 2014
Published: 27 December 2014
The last few decades have recorded a high frequency of the meteorological drought phenomenon. Southern and south-eastern Romania make no exception, with such phenomena often occurring from July to November 2011, which brought about an agrometerological drought that lasted from the third decade of July to early December, with a slight improvement in October. This situation led to a decrease in soil water reserves, mainly in the first 20 cm, with a negative impact on agricultural crops and the following agricultural year as well.
The methodology was based on a correlative analysis between the decadal rainfall quantities and the existing soil water reserve, during the interval between June and November 2011, for eight weather stations.
The statistico-mathematical data analysis showed an intensification of the pedological drought phenomenon in September, with a slight improvement in October and an increase in November.
KeywordsPrecipitation Temperatures Water climatic Drought Soil
The increase of the meteorological drought phenomenon leads to the occurrence of the pedological drought and, hence, of aridity, combined with a high soil temperature and evapotranspiration. Such situations, according to statistical history, were recorded in 2000, 2001, 2007, 2011, 2012 and 2013.
There have been concerns regarding the analysis of the phenomena of aridity occurrence ever since early 20th century (Lang – 1920 – the rain factor; De Martonne – 1926 – the aridity index – etc.). In Romania, many climatological geographers have had similar preoccupations -.
Data and working methods
The present study does not aim to calculate the climatic water deficit (CWD) and the De Martonne aridity index (Iar), as these parameters have already been identified, and correlations between them have also been made ,,, therefore the territorial map of the aridity index in Romania – mm/°C has been drawn as well .
This approach aims rather to identify and characterise the agrometeorological phenomena of hydric risk by taking into consideration parameters and critical thresholds during the intervals which are specific to phenological processes and phases. Such analyses can be performed decadally, bimonthly, monthly, seasonally, annually or permanently with a view to adopting negative effect prevention and reduction measures . In this regard, we have conducted a correlative analysis between the decadal rainfall quantities and the existing soil water reserve, during the interval between June and November 2011, for eight weather stations (Piteşti, Ploieşti, Târgovişte, Turnu Măgurele, Alexandria, Oltenţia, Fundulea).
where AWC = available moisture, and h = depth.
In the calendar year 2011, the annual mean temperature in Romania was 9.2°C, 0.3°C higher than the climatological normal, with positive deviations between 0.1°C (in March and May) and 2-6°C in September, but also with negative deviations in February, April, October and November (0.1°C – April up to 2.7°C in November) from the climatological normals.
The country average annual rainfall was 500.4 mm, 22% under the climatological normal, due to the deficits recorded in most months. The excess rainfall was in June-July, while the rest of the months were characterised by deficit, with negative deviations ranging between 10-97%. Months with deficit were March (40%), August (53%), September (72%) and November (97%). As a result, the year 2011 was characterised by low rainfall, with November the driest month, and by pedological drought installed differentially at regional level .
The statistico-mathematical data analysis of decadal rainfall quantities recorded at the eight agrometeorological stations located in the field region under study, correlated with the soil water reserve recorded in July-November 2011, showed an intensification of the pedological drought phenomenon in September, with a slight improvement in October and an increase in November.
The average available moisture (AWC) required for plant development, according to norms, is 400 at 20-cm depth, 820 at 40 cm and 1500 at 80 cm.
The results of the study have emphasised the consequences of an agrometeorological phenomenon of risk, with negative effects mainly on summer-autumn agricultural crops, leading to a decrease of the agricultural production, but also with significant implications on the following agricultural year (2012–2013), due to inability to perform specific agro-technical works or, if they had been carried out, they had to be redone because seeding had been compromised.
Available water capacity
This article was put together with the help of information gathered from the Meteorological and hydrological stations at Târgovişte and from the Basarab I Emergency Inspectorate, Dâmboviţa county.
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