METHOD OF ASSESSING SPECIES VARIETY OF GRASS BASED ON PRESENCE OF INDIVIDUAL PLANTS ON SAMPLE SITES OF DIFFERENT SIZES Russian patent published in 2016 - IPC A01G7/00 G01N33/00 

FIELD: measurement technology.

SUBSTANCE: invention relates to measurement of quality of various species complexes of grasses and herbs on samples, mainly on floodplain meadows, and can be used in environmental monitoring of areas with grass cover. Invention also relates to landscape of small rivers with meadow vegetation and can be used in assessing grass species based on presence of individual types of plants. Method involves selecting on a small river or its inflow, visually on a map or full-scale section of floodplain meadows with grass cover, marking on said section downstream of small river or its inflow in characteristic points at least three hydrometric sections in transverse direction. Along each hydrometric section, test sites are marked on each side of small river or its inflow. Regularity of parameters of samples of grass is determined. For counting variety of types of grass plants on section of floodplain meadow points of future centres of complex sample sites are identified. In each centre of complex sample sites pegs are placed and square frame with different sites are arranged concentrically. Square frames are installed with orientation of sides along and across bed of small river or its inflow. Then inside each square frame number of types of grass is counted and recorded in a table for each size of sample sites. Further, based on each table sums of types of grass and sample sites are calculated. Said sums are used to calculate ratio to sum of types of grass and to sum of all complex sample sites. Then, statistical modelling is used to determine range distribution on two values: relative occurrence of each type of grass on all sample sites and variety of types of grass on each sample site of said section, followed by calculation of correlative variation coefficient from number of types of grass, and estimation of species composition of plants is performed on range distribution relative to occurrence of plants.

EFFECT: method provides more accurate accounting for presence of types of grass and plants at all sample sites with simultaneous reduction of labour input of analysis of species composition thereon, simple process of analysis of species composition only based on number of types on sample sites, improved capabilities of comparing grass samples on two values: relative occurrence of each type at all sample sites and diversity (relative occurrence) of types of grass on each sample site of this section, without cutting grass samples from sample sites.

8 cl, 6 dwg, 11 tbl, 1 ex