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

Accueil du site → Doctorat → Chine → 2002 → Study on the relationship of between vegetation evolution and soil water and salt movement in the desert-oasis

China Agricultural University (2002)

Study on the relationship of between vegetation evolution and soil water and salt movement in the desert-oasis

Zhao, Yi Cheng

Titre : Study on the relationship of between vegetation evolution and soil water and salt movement in the desert-oasis

Auteur : Zhao, Yi Cheng

Université de soutenance : China Agricultural University

Grade : Doctor of Philosophy (PhD) 2002

Résumé

Taking Sangong River Basin as a typical example, the law of vegetation succession of desert-oasis was systemically studied through the field experiment and the TM images analysis of different periods. It was shown that the net biomass of different community changed greatly in different growth period and the vegetation succession becomes regressive state. The biomass above ground was calculated by the features of crown diameter of desert plant. The results by field experiments indicated that the depth of crop consume irrigated water limiting in 0-40cm in arid zone and 2 m groundwater table is a sensitive depth for controlling deep percolation in the farmland. It was found that the 90-100cm depth of soil profile was a handicap layer for desert plant consumes water in sand land. It was obvious that soil salt accumulated in deep soil of farmland and soil salt accumulated in surface horizon of uncropped soil. Spatial variability of soil physical and chemical properties were analyzed by geostatistics approach

Accès au document : Proquest Dissertations & Theses

Page publiée le 2 mai 2015, mise à jour le 20 septembre 2017