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sur le développement des zones arides et semi-arides

Titre : Study on the Improvement Effect of Strip Caragana Korshinskii on Artemisia Ordosica Grassland in Desert Steppe

Auteur : 刘星

Grade : Master 2022

Université : Inner Mongolia Agricultural University

Résumé
Take the natural desert grassland Artemisia ordosica grass field as a control,three strip planting modes of Caragana korshinskii（strip spacing of 3M,6m and 9m,Caragana bandwidth of 1m）are configured in Artemisia grassland,through 3m row spacing,6m row spacing,9m row spacing three belt-like planting methods of Caragana korshinskii,after three years of enclosure,compare plant types,heights,coverage,and changes in the yield of forage grass,explored the improvement effect of artificial Caragana korshinskii shrubs with different row spacings on the grassland of Artemisia ordosica,and obtained the best belt-shaped planting model of Caragana korshinskii.Provide a theoretical basis for the restoration and sustainable use of the desert grassland of Artemisia ordosica grassland,the growth of desert plants and the restoration of reasonable allocation patterns.The main results are as follows :（1）The planting strip of Caragana korshinskii with 6m strip spacing is more reasonable.Caragana korshinskii has higher height and larger cluster diameter than 9m strip spacing,and has relatively large abundance and yield compared with 3m strip spacing.（2）There are relatively high restrictions on the spacing of Artemisia ordosica plant population in 6m strip space.At this time,its yield and abundance decrease sharply（compared with CK,natural Artemisia ordosica grassland）,and its height and cluster diameter are also limited to a certain extent.（3）With the increase of Caragana korshinskii strip spacing,the plant families and genera,species number,Shannon-Wiener diversity index and of plant community increased,but the dominance index decreased ;the height of plant community of 6m strip spacing decreased relative to CK,and the abundance,coverage and biomass were the largest.（4）The similarity of plant communities with different strip spacing and natural grassland plant communities shows that the plant communities with 9m strip spacing are highly similar to the natural grassland（the similarity coefficient is 0.6400）,and the similarity between the plant communities with 6m strip spacing and 9m strip spacing is the highest,which is 0.6452.The similarity between plant communities with 6m strip spacing and other plant communities is high,indicating that it contains the species change characteristics of other communities.Finally,according to the correlation degree of the optimal parent sequence and the overall research results,the overall quantitative characteristics of the plant community with strip spacing of 6m is higher,the species diversity is larger,the Caragana korshinskii plant population is better,and the Artemisia ordosica plant population is inhibited better.

Mots clés : Artemisia ordosica ;Caragana korshinskii ;Desert steppe ;Strip arrangement ;Species diversity ;

Présentation (CNKI)