Method for building and digitally expressing grassland vegetation subtypes

Abstract

The invention relates to a method for building and digitally expressing grassland vegetation subtypes. The method comprises the following steps of (1) marking a searched area, and searching vegetation of acquired searching sample points; (2) calculating the plant species dominance degree of vegetation of each searching sample point; (3) according to the plant type and the plant species dominance degree of each searching sample point, judging whether the searching sample points have the same vegetation subtype or not, and when the vegetation subtype is changed, actually measuring the boundary coordinates of different vegetation subtypes to obtain the vector base map of each vegetation subtype in the searched area; (4) building an attribute data table of each vegetation subtype, and drawing the digital vector distribution diagram of each vegetation subtype by adjusting and overlapping transparency of diagram layers; (5) placing the obtained digital vector distribution diagrams of the vegetation subtypes together, and finally generating the digital vector distribution diagram which shows the vegetation subtype distribution in the searched area and the formation and distribution of dominant plants in the vegetation subtypes. The method is widely applied to practical applications, such as research on the evolution of grassland vegetation, agricultural production, grassland vegetation resource monitoring.

Description

technical field [0001] The invention relates to an informatization and digital representation method of grassland vegetation, in particular to an establishment and digital representation method of a grassland vegetation subtype. Background technique [0002] In terms of the classification of grassland types, scholars at home and abroad have proposed dozens of methods in seven categories. Academician Ren Jizhou of my country proposed the famous comprehensive sequence classification system for grasslands. According to this system, grasslands can be divided into: class-based on meteorological factors temperature and precipitation, sub-category-based on soil factors, type-based on vegetation factors, under type According to the characteristics of vegetation, it can be divided into subtype, miniature and so on. Since the beginning of the 21st century, with the widespread application of computer technology, network technology, "3S" technology and geostatistics, the visualization a...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many researches on the visualization and digitalization of grassland types, subtypes, and types at the large-scale level. Digital grassland distribution maps and their attribute databases at the level of types, subtypes, and types have been established. There is no reliable digital method for plant composition and plant dominance information, and there is a lack of clear principles and methods for naming vegetation subtypes.

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