Ranking grey numbers based on dominance grey degrees

With respect to the decision making problems where a lot of fuzzy and grey information always exists in the real-life decision making information system methods as fuzzy mathematics, it is difficult for such uncertainty probability, and interval numbers to deal with. To this end, based on the thought and method of grey numbers, grey degrees and interval numbers, the concept of dominance grey degree is defined. And then a method of ranking interval grey numbers based on the dominance grey degree is proposed. After discussing the relevant properties, the paper finally uses an example to demonstrate the effectiveness and applicability of the model. The result shows that the proposed model can more accurately describe uncertainty decision making problems, and realize the total ordering process for multiple-attribute decision-making problems.

Forest Community Structure and Species Diversity of Eight Forest Communities in Wenchang City

The research took different forest communities in Wenchang Satellite Launch Center as the research object and selected 8 forests to explore species diversity, evenness, and dominance of forests. The results showed that species diversity tended to be volatile upon forest communities; semi-mangrove species was the richest, as high as 2.38, followed by natural secondary forest and mixed forests. Plant evenness from high to low was as follows： herbaceous layer〉shrub layer〉tree layer. Natural secondary forest was higher in canopy density, and fewer in herbaceous plants; diversity and evenness were lower than shrub layer. Mangrove forests held lower dominance, and dominance showed insignificant differences among species.

Survey and Analysis on Alien Invasive Plants of Jinziling Scenic Spot in Pingle County

According to the field survey of alien invasive plants of Jinziling,there were 23 kinds of alien invasive plants in the scenic spot.Species with the comprehensive dominance degree higher than 10% were as follows: six kinds of Asteraceae: Bidens pilosa,Aster subulatus,Ageratum conyzoides,Conyzai canadens,Parthenium hysterophorus,and Conyza sumatrensis; two kinds of Gramineae: Axonopus compressu,Eleusine indica; two kinds of convolvere: Ipomoea nil,Ipomoea purpurea; two kinds of Fabaceae: Cassiae tora,Medicago hispida; one kind of Verbenaceae: Lantana camara; one kind of Euphorbiaceae: Euphorbia hirta.In total,there were 14 kinds of alien invasive plants.In this survey,the dominant species of invasive plants were obtained by statistical analysis of the composition and distribution of the invasive plants,and the invasion trend was predicted,so as to take effective and economical management and control measures.

Genetic Analysis of Quantitative Signs of White Lupin (Lupinus albus L.) Genotypes

Genetic variability in the base population plays an important role in crop⁃breeding program.A comprehensive assessment on the quantitative signs of white lupin genotypes was performed to be included in the selection process.Two limits of the environment were applied,i.e.,dense and sparse sowing.Positive true heterosis was established in PI533704×Zuter and PI533704×Lucky801 crosses by using the traits of the weight of nodules and fresh root mass weight at both limits of the environment.In more favorable growing conditions,the number and weight of nodules,as well as fresh aboveground mass weight had greater influence on the inheritance of epistatic gene interactions.In the case of dense sowing,the dominant gene actions for the weight of seeds were found more significant.With a high coefficient of inheritance in both environments,the hybrids of PI533704×Zuter and Lucky801×PI533704 were characterized by number and weight of nodules,Zuter×PI533704 by fresh root and aboveground mass weight,and almost all hybrids by seed weight per plant.The assessment of the initial material makes it highly likely to speed up the process of creating new varieties of white lupin.