[Direct task of phytocenoses ecological ordination: comparative analysis of solution methods]
2000
Sachok, G.I. | Salivonchik, S.V. (Institut for Problems of Natural Resources Use and Ecology, National Acad.of Sciences of Belarus, Minsk (Belarus))
Definition of the direct task of ecological ordination is given as a computation procedure of ecological coordinates of the edaphotope corresponding to the phytocenosis specified by a list of species with their quantities in the accepted coordinate system of ecological factors. Two methods of its solution were used in the work: limitation (by Romensky) and Gaussian (by the authors). Computation of the object parameters, soil nutrient content and humidity was done in accordance with the materials of two classifiers of meadow vegetation of Belarus for association and formation lists used in the IMS (information modeling system) "Biogeocenotic variety of Belarus". Statistical analysis of the results obtained for two object rows and their comparison by different methods: by rows correlation coefficient as well as by criterion of distribution parameters comparison - average values - by Student and standard deviation - by Fishery were carried out. The revealed distinction of results obtained by different methods is considered to be particular, without the character of systematic dislocation, caused by the features of a specific row and do not enable to give preference to one of these methods in this case. However, this method allows to receive for the object two statistical parameters: average arithmetical value and standard deviation (by Ramensky - estimation of arithmetical value only), it has mare strict statistical ground and logical continuation in the authors' method of ecological ordination reverse task solution
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