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Lanzhou University (2017)

Natural Regeneration Strategies of Calligonum Mongolicum under Different Aeolian Environments

樊宝丽

Titre : Natural Regeneration Strategies of Calligonum Mongolicum under Different Aeolian Environments

Auteur : 樊宝丽;

Grade : Doctoral Dissertation 2017

Université : Lanzhou University

Résumé
Calligonum mongolicum,a great windbreak and sand-fixation pioneer species occurred in mobile and semifixed dunes,is regarded as one of the most important building groups of sandy vegetation,and most suitable afforestation species for sand-fixation in arid areas,which plays an extremely important role in protecting the ecological security in Western China.C.mongolicum shows a strong ability of natural regeneration in desert mobile sand dune,but this ability is sharp decline when the sand dune is getting fixed.The ecological and physiological mechanisms which behinds this phenomenon is still poorly known.In this thesis,we investigated reproductive features and natural regeneration strategies of C.mongolicum in three different aeolian environments from various of aspects including the number of seeds,the pattern of seed dispersal,the density of seeds in soil seed banks,seed germination rate,seedling emergence rate and clonal growth to reveal the factors resulted in weak natural regeneration after sand dune were fixed.The results are shown as following:1)C.mongolicum had several reproductive strategies to adapt to various aeolian environments in deserts.First,it flowered and produced seeds 2-3 times a year.The phenology played an important role in seed production.The seed mass of matured seeds is : September

Mots clés : Aeolian environment; natural regeneration; Calligonum mongolicum; reproductive strategie; dune-fixating forestation;

Présentation (CNKI)

Page publiée le 13 janvier 2018