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sur le développement des zones arides et semi-arides

Titre : Effects of Different Plant Configuration Patterns on Soil Physical and Chemical Properties along Yellow River Section of the Kubuqi Desert

Auteur : 杨圃畅

Grade : Master 2022

Université : Inner Mongolia Agricultural University

Résumé partiel
The ecological security of the Yellow River basin is seriously threatened by the sand drift into the Yellow River.In this study,five different plant configurations of Populus alba Linn.var.pyramdalis Bunge + Pinus sylvestris Linn.var.mongolica Litv mixed forest（YZ）,Populus alba Linn.var.pyramdalis Bunge + Caragana korshinskii mixed forest（YN）,Populus alba Linn.var.pyramdalis Bunge + Hedysarum laeve Maxim mixed forest（YY）,Populus alba Linn.var.pyramdalis Bunge + Hedysarum scoparium mixed forest（YH）,and Hedysarum scoparium + Salix psammophila Schneid mixed forest（HS）were selected as the research object,through field sampling and laboratory experiments analysis method of combining the characteristics of typical plant communities in the study area and its physical and chemical properties of soil investigation and study,analysis of different plant configuration mode of ecological recovery effect,explore the attraction desert along the yellow section of the appropriate way of repair,as the attraction of desert along the yellow section provides the theory basis for effective protection and sustainable management.（1）In the study area,five configuration patterns effectively promoted the restoration of local vegetation,and 10 herbaceous plants appeared,among which Corispermum declinatum Steph and Artemisia desertorum Spreng were the dominant species.The maximum average density,average coverage and average height of herbaceous community were 141.67 plants /m2,18.04% and 0.17 m,respectively,in the Hedysarum scoparium +Salix psammophila Schneid mixed forest（HS）.The Patrick richness index of herbaceous community was YY（4.67）＞YN（3.50）＞YZ（3.33）＞YH（1.83）＞HS（1.67）.Shannon-wiener diversity index,Simpson dominance index and Pielou evenness index varied from 0.32 to 0.64.（2）Soil natural water content,capillary water retention,minimum water retention and capillary porosity under five configuration modes were all higher than those under control group LS.The soil particles in the study area were mainly fine sand and medium sand,with the average content of 65.81% and 21.21%,respectively.The order of fractal dimension in each configuration mode was YZ（2.36）＞YN（2.29）＞YY（2.24）＞YH（2.23）＞HS（2.15）,and the fine particles were mainly concentrated in the soil surface.In the distribution of soil particle frequency,the peak heights of the five configuration modes were LS＞HS＞YY＞YH＞YZ＞YN in descending order,all of which were single peak and narrow.

Mots clés : Kubuqi Desert ;Soil physical and chemical properties ;Characteristics of vegetation community ;Configuration mode ;

Présentation (CNKI)