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

Accueil du site → Doctorat → Chine → 2009 → Corresponding Relationships between Populus Euphratica Growth and Water-Soil Condition Changes of Ejina Oasis in the Lower Reaches of the Heihe River

Lanzhou University (2009)

Corresponding Relationships between Populus Euphratica Growth and Water-Soil Condition Changes of Ejina Oasis in the Lower Reaches of the Heihe River

李启森;

Titre : Corresponding Relationships between Populus Euphratica Growth and Water-Soil Condition Changes of Ejina Oasis in the Lower Reaches of the Heihe River

Auteur : 李启森;

Grade : Doctoral Dissertation 2009

Université : Lanzhou University

Résumé partiel
This study object is aim at the riparian Populus euphratica forest as a dominating growth and widely distributing in Ejina Oasis in lower reaches of Heihe River. According to the relevant the informations in the tree-ring data for the P. euphratica tree growth and its environmental changes-and-affects in past, a great deal of the data in relation to the P. euphratica tree growth in the past different growth periods were extracted from the tree-ring data by the forest inventory method and the tree-ring analysis technique. Base on the analysis of corresponding correlation between these tree growth data and the field observation and monitoring data of regional climate, hydrology and soil condition dynamic changes in past years, revealing that corresponding correlativity between the P. euphratica tree growth and its environmental condition changes-and-affects. For example, according to field investigation and statistical analysis for the P. euphratica tree growth in different stand growth types (i.e. natural-, semi-natural- and planted stand), different water-soil condition, different growth phases and periods, analysis and demonstating that corresponding relationships between the different indices in the course of the P. euphratica tree growth in lower reaches of Heihe River ; based on the application of the tree-ring analysis technique and a series of correlative models established between the different indices of P. euphratica tree growth, a great deal of basis informations of the P. euphratica tree growth in past different period extracted from the tree-ring data, such as diameter at breast height (DBH), total tree height (HT), aboveground accumulative tree volume (i.e. main stem volume and branch stem volume), accumulative biomass and its allocation (i.e. main stem biomass, branch stem biomass, root biomass and leaf biomass). Furthermore, analysis and revealing that the tree growth rule and dynamic changes with increasing tree-age ; meanwhile, P. euphratica tree growth rule in different water-soil condition was revealed by the statistic analysis of correlation between the tree population dynamic changes and environmental influences. Additionally, addressing and explaining the corresponding relationships between the P. euphratica tree growth and various indices of the regional climate, surface runoff, groundwater and soil conditions, and relevant models were eatablished and validated, and then, P. euphratica tree growth level and its environemt quality were simply estimated and evaluated based on the relevant models. These finding would be helpful to improve and enhance for the evaluation system of the dynamic changes between oasis vegetation development and its environment evolvement in lower reaches of the Heihe River.This study results showed that it is quite close for the corresponding correlations between various indices of the P. euphratica tree growth in whole lifetime, among them, P. euphratica DBH, as an important estimating index for the tree growth, correlation between it and other growth indices are also quite close, and it is play an important pole in the aspects of the P. euphratica individual and population growth rule and dynamic changes revealed, and a larger growth potential implicated in different growth phases, as well as the tree growth sensitivity and variability exhibited response to its environmental changes-and-affects.

Mots clés : Arid area; Oasis; Populus euphratica; Riparian forest; Climate; Water-soil condition; Corresponding; Correlation;

Présentation (CNKI)

Page publiée le 1er juin 2018