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Lanzhou University (2020)

Study on Development of Goat Track Landscape and Succession of Plant Community in Semi-arid Hilly Region of Loess Plateau

张永红;

Titre : Study on Development of Goat Track Landscape and Succession of Plant Community in Semi-arid Hilly Region of Loess Plateau

Auteur : 张永红;

Grade : Master’s Theses 2020

Université : Lanzhou University

Résumé
Grazing disturbance has an important impact on the grassland ecosystem.During the grazing process,landscape diversity has been increased on a spatial scale due to the free feeding and stamping of livestock.The landscape composed of small paths and plant patches trampled by livestock,named of track landscape,is widely distributed in the semi-arid area of the Loess Plateau in China.In this study,the goat track landscape in the semi-arid hilly area of the Loess Plateau was taken as the research object.The three grasslands(G0,G1,and G2)were selected as the study area,and ploughed to remove the original goat pasture.Grassland without goats was used as a control(G0).The plants in G0 and G1 were picked out,and the plants in G2were retained.The field observation was carried out for 6 years by using photogrammetry and remote-sensing technology.The experiment quantitatively depicts the formation and dynamic changes of the goat track network through track density and vertices,and comparatively analyzes the characteristics of plant communities and species diversity in the study area,and then discusses development and evolution process of the goat track landscape.The results of the study are as follows:1.During the formation of the goat track network,the dominant species at various stages have been continuously replaced with the development of track.The plant communities in the G0,G1 and G2 plots had 14 families,21 genera and 24species,and the proportion of Compositae(35.71%)and Gramineae(28.57%)were greater than that of other families.The disturbance of grazing has a significant effect on the composition and structure of plant communities.Compared with G0,the plant richness and diversity index of G1 and G2 increased,but the plant density and cover decreased due to feeding and trampling of goats.2.The goat track network consists of track and vertices,and the track road turns or crosses are vertices.A few parallel track appeared one month after tilling,which did not penetrate the entire plot.Four months later,parallel track penetrated the entire plot and formed bifurcations

Mots clés : Loess Plateau; plant community characteristics; species diversity; track network; goat track landscape;

Présentation (CNKI)

Page publiée le 30 mars 2022