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sur le développement des zones arides et semi-arides

Titre : Comparative Study on Sand-fixation Effect of Three Herbaceous Plants by Wind Tunnel Experiment

Auteur : 程锋梅

Grade : Master 2022

Université : Xinjiang Agricultural University

Résumé partiel
Desertification is a worldwide environmental problem,which seriously restricts the sustainable development of regional economy and society.Wind erosion desertification is one of the important types,and wind control and desertification control has become an important task in the economic and social development of arid and semi-arid regions.In desert ecosystem,especially desertification steppe ecosystem,although herbaceous plants have very small biomass,they give great contribution to species richness and diversity for plant community.Moreover,herbaceous plants have the advantages of rapid population reproduction and rapid growth,and have the unique function of maintaining habitat stability.Therefore,herbaceous plants also play an important role in wind prevention and sand fixation,and plant coverage and plant type are the main factors affecting their sand-fixation ability.It is important to identify the difference of sand-fixation effect of herbaceous plants with different plant types in ecological restoration measures,but there are few relevant researches at present.By wind tunnel simulation experiments in this paper,in the blank control（0%）and five kinds of coverage（25%,30%,35%,40%and 45%）,under the condition of three kinds of plants type（creeping,globular,plexiform）herbs wind speed,wind erosion rate and wind erosion of sand inhibition rate were determined,the contrast analysis of the situation about the plant type plant of wind erosion and wind erosion inhibition,mainly has the following findings :（1）The wind erosion rates of the three plant types showed a linear decreasing trend with the increase of coverage,and had a high correlation coefficient（R 2＞0.87）.From the slope of the fitting trend line,it was plexiform＞creeping＞globular.The wind erosion inhibition efficiency of the three plant types showed a linear increase trend with the increase of coverage.The smaller the coverage,the greater the difference among the three plants,and vice versa.The differences of sand-fixation ability of the three plants were closely related to their plant type,density of branches and leaves,and growth characteristics of plant height.

Mots clés : herbs ;plant type ;wind tunnel experiment ;wind erosion rate ;wind erosion inhibition efficiency ;

Présentation (CNKI)