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University of Chinese Academy of Sciences (2006)

Approaches to Ecological Restoration of the Vegetation in Otingdag Sand Land, China

宋创业;

Titre : Approaches to Ecological Restoration of the Vegetation in Otingdag Sand Land, China

Auteur : 宋创业;

Grade : Master’s Theses 2006

Université : University of Chinese Academy of Sciences

Résumé
Otindag Sand Land lies in the middle of Xilin Gol plateau, Inner Mogolia, China. It is one of the sand land in the steppe zone of China. Long-term immoderate exploration of the sandy grassland had resulted in the vegetation degradation and a series of environmental problems, such as activation of fixed sand dunes and sandstorm breakout. These problems threaten the ecological safety and impact the sustainable development of economy and society. So, it is very urgent to restore the vegetation and prevent further extension of the problems.The aim of this research is to reveal the ecological relationships between the vegetation and its environment, between the plant species diversity and the soil environmental factors, to understand the effect of sowing time on the yield of maize for silage in Otingdag sand land, and further to provide theory evidence for selection of optimal species and planning feasible approaches of vegetation restoration. This thesis includes : 1 the relationship between plant community and soil on the inter-dune lowland of Otindag Sand Land ; 2 the relationship between the plant species diversity and the soil environmental factors in the middle of Otingdag sand land ; 3 effect of sowing time on the yield of maize for silage in Otingdag sand land.In order to study the relationship between vegetation types of inter-dune lowland of Otindag Sand Land and factors of soil,a vegetation survey was conducted in the summer of 2004. 102 samples collected during the survey were classified into twenty-eight groups based on the species important values and dominant species. The first axis of detrended canonical correspondence analysis(DCCA) denoted the change of ground water level and the factors such as pH values,contents of soluble sodium and soluble potassium which are related to ground water level.

Mots clés : Otindag Sand Land; Ordination; Environmental factors; Species diversity; Sowing time; Maize; Biomass;

Présentation (CNKI)

Page publiée le 23 octobre 2017