Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 113-124
Modelling the ecological niche of wheat septoriosis using remote sensing data
D.V. Malakhov
1 , N.Yu. Tsychueva
1 , I.S. Vitkovskaya
1 1 National Center for Space Research and Technology, Almaty, Republic of Kazakhstan
Accepted: 07.02.2017
DOI: 10.21046/2070-7401-2017-14-1-113-124
The papers describes the modelling of suitable conditions for septoriosis outbreaks in main grain-producing regions of Kazakhstan. Model development consists of two major stages: the development of basic model by climatic variables and the updating of basic model with predictive factors obtained from remotely sensed data. The base model represents a set of climatic variables that is optimal for septoriosis manifestation (mean, maximal and minimal monthly temperatures, monthly precipitation, evapotranspiration etc.). This model is a starting point to develop prediction algorithms for disease outbreaks in major grain-producing regions of Kazakhstan. The model key parameters indicate that the cold season is crucially important within the life cycle of disease pathogen. Preliminary algorithm of septoriosis outbreaks forecast involves the use of dynamic variable – VCI (Vegetation Condition Index). VCI, calculated for a given year, is further used to outline the most probable areas of septoriosis outbreak if applied along with basic model. The presence of certain correlations between traditionally used HTC (Hydrothermal coefficient by Selyaninov) and VCI confirmed the usage of VCI. HTC, which is important factor for septoriosis development, has, however, high approximation level because its calculation assumes the interpolation of small number of meteorological stations data within a large area. VCI calculated from satellite data is an objective indicator of vegetation condition having high spatial resolution. The suitability and reliability of VCI in conjunction with the base model of the ecological niche of Septoria for predicting disease outbreaks are discussed in this paper and represent the subject of further study.
Keywords: septoriosis, ecological niche, VCI, hydrothermal coefficient
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