Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Chine → 2020 → Study on Functional Characters and Functional Group Dynamics of Different Succession Plants in Stone Desert Area of Karst Plateau

Guizhou University (2020)

Study on Functional Characters and Functional Group Dynamics of Different Succession Plants in Stone Desert Area of Karst Plateau

赵庆;

Titre : Study on Functional Characters and Functional Group Dynamics of Different Succession Plants in Stone Desert Area of Karst Plateau

Auteur : 赵庆;

Grade : Master’s Theses 2020

Université : Guizhou University

Résumé partiel
Plant functional traits refer to a series of core plant attributes that are closely related to plant colonization,survival,growth and death,and these attributes can significantly affect ecosystem function and reflect the response of vegetation to environmental changes.In this study,the method of"space instead of time"was adopted in the stone desert area of karst plateau,and five stages of plant communities were selected as research objects:herbaceous community stage,grass-shrub transitional community stage,shrub-shrub stage,shrub-shrub stage and Arbor stage.Firstly,the adaptive functional characters of dominant species in different succession stages in stone desert region of karst plateau were studied,the average characteristics of communities were calculated respectively,and the communities in five succession stages were compared longitudinally.The differences of leaf functional characters in different succession stages in stone desert region of karst plateau were revealed.Secondly,taking the leaves of dominant plant species in each stage as the object,the relationship between leaf morphological and functional characters and water-holding function was studied.Finally,the ecological and economic functions of dominant tree species in different succession stages in the stone desert area of karst plateau were comprehensively evaluated,and the eco-economic function groups of tree species were divided.The main conclusions are as follows:The main results are as follows :(1)in this study,38 community plots in rocky desertification area of karst plateau were divided into 10 types by using bi-directional indicator species classification(TWINSPAN)and canonical correspondence analysis(CCA),including 5 succession stages(herbaceous stage,grass irrigation stage,shrub stage,tree shrub stage and Arbor forest stage).Among them,the dominant environmental factor for grassland is altitude,slope and rock exposed rate are the dominant environmental factors for grass shrub,shrub and tree community,and at the tree stage,soil type and slope direction are the environmental factors that determine the distribution of tree community.(2)there are great differences in unified characters among different species,and the characters are weighed against each other.The ratio of leaf length to width is 1.56-123.86,the leaf area is1.68-374.38 cm2,the specific leaf area is 28.68-301.12 6cm2·g-1,the leaf dry matter content is0.19-0.77 g·g-1,the leaf thickness is 0.43-2.17mm,and the leaf tissue density is 0.003-0.044g·cm-3,chlorophyll Spad value 23.5-53.31.The functional characters of leaves of the same species changed with the process of vegetation restoration.The ratio of leaf length to width was positively correlated with leaf dry matter content and leaf tissue density(P<0.05),and negatively correlated with leaf thickness and specific leaf area(P<0.01).There was a very significant positive correlation between leaf area and leaf thickness(P<0.01),but a significant negative correlation between leaf area and leaf dry matter content and leaf tissue density(P<0.05).

Mots clés : Karst; plant leaves; functional characters; functional groups; water retention; restoration dynamics;

Présentation (CNKI)

Page publiée le 19 mai 2021