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sur le développement des zones arides et semi-arides

Titre : Temporal and Spatial Distribution Characteristics of Atmospheric Dust in Cele,Xinjiang and Its Impact on Physical and Chemical Properties of Oasis Farmland Soil

Auteur : 苏松领

Grade : Master 2022

Université : Xinjiang Normal University

Résumé partiel
Atmospheric dust plays an important role in the biochemical and physical exchange on the ocean,atmosphere and land surface.Since the geological historical period,the exchange process has continued to this day.Some important pollutants with atmospheric dust as the transport carrier will accumulate in the atmosphere,water,soil and plants in different forms during the circulation of different ecosystems,Furthermore,the food chain poses a threat to human health.Cele County on the southern edge of Tarim Basin is an extremely arid area with serious wind and sand hazards.Studying the effect of natural atmospheric dust on Cele Oasis Soil will help to take effective protective measures,improve the soil quality of wind and sand soil,and reduce the adverse impact of dust hazards on vegetation growth and development,To improve the yield of farmland crops in Oasis and realize the local farmers to get rid of poverty and become rich,the theory has broad application prospects and important research value.Using the method of mathematical statistics,this paper makes an in-depth study on the near surface atmospheric dust fall,the temporal and spatial differentiation characteristics of physical and chemical properties and the impact on soil physical and chemical properties on different underlying surfaces inside and outside the oasis in Cele county.The research shows that :（1）The amount of atmospheric dust fall in Cele is higher in spring and summer and lower in autumn and winter.With the increase of altitude,the amount of atmospheric dust in Cele shows a decreasing trend.On the whole,from the quicksand land to the edge of the oasis,with the increase of the coverage of natural vegetation on the surface,the amount of dust fall also increases sharply.After entering the oasis,due to the blocking effect of tall and dense protective forest network,crops,houses and other buildings,the amount of dust fall in the near surface atmosphere shows a decreasing trend.Among them,the amount of dust fall in shiyizhakou is higher,which is due to the short reclamation period of shiyizhakou and no crop cultivation all year round,Due to the strong wind at the tuyere,the dust fall in the Gobi desert is low,which is due to the low vegetation coverage in the Gobi desert,the strong wind and the difficulty of fine particles settling.（2）Under different oasis processes,the dust falling in the atmosphere and the high sand material in the two layers of soil are composed of very fine sand,very coarse silt,fine sand and coarse silt,among which the very fine sand and very coarse silt are relatively large.There is little difference between the height of atmospheric dust fall and that of soil profile,and the particle size of surface soil is finer than that of atmospheric dust fall as a whole.

Mots clés : Atmospheric dustfall ;Dust fall amount ;Particle size ;Organic matter ;Nutrients;Cele ;

Présentation (CNKI)