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OKAYAMA UNIVERSITY (2014)

Stand structure and dynamics of riparian Populus euphratica forest located in Ejina Oasis, Inner Mongolia, China

LI Xiaogang

Titre : Stand structure and dynamics of riparian Populus euphratica forest located in Ejina Oasis, Inner Mongolia, China

Auteur : LI Xiaogang

Université de soutenance : OKAYAMA UNIVERSITY

Grade : Doctoral Thesis 2014

Présentation

In Ejina Oasis, most of riparian area along the east and west tributaries of Heihe River are occupied by large P. euphratica forests. These forests have important ecological and economic values for local people, such as suitable mild climate for both human residents and wildlife inhabitants, fertile soil for agricultural production and livestock husbandry and etc. The complicate structure of both underground and aboveground parts endues them to prevent soil erosion by stream and wind in the extreme weather condition. These huge and wide forests established in Badain Jaran Desert can effectively prevent DSS in Northeast Asia. However, most of them have been deteriorated by reclamation and over exploitation of forest material and desertification induced the predominance of harsh weather and the loss of ecological services from the forests. Therefore protection and restoration of P. euphratica forests become a very important issue for natural conservation and sustainable development of human society.
In Ejina Oasis, riparian forests along the, west tributary of Heihe River are relatively remained their original and natural situation, namely big size of canopy tree and huge number of regenerating small trees, because of long distance from the residential area. The permanent experimental plot was established in a natural P. euphratica forest at the middle basin of the west tributary to clarify the forest dynamics and the key process ensuring the sustainability under unreliable weather condition for the development of management and restoration technology in dryland. Structure and growth of canopy trees were measured to reveal the mechanisms of forest sustainability. Numerical change of both canopy trees and understory population were investigated by demographic analysis to know the resilience of regeneration strategy. Effects of environmental factors on establishment, regeneration and growth of P. euphratica forest were examined by the spatial association of trees with site conditions.

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Page publiée le 15 octobre 2016