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Xinjiang University (2004)

Studies on the Survival and Adaptability of Three Desert Plants under Different Sandy Soil Water Conditions

张毅; Zhang Yi

Titre : Studies on the Survival and Adaptability of Three Desert Plants under Different Sandy Soil Water Conditions

Auteur : 张毅; Zhang Yi

Grade : Master’s Theses 2004

Université : Xinjiang University

Résumé
Normally many xerophytes have particular ability to endure drought for a long time. Whether these plants receiving enough soil water in the process of growing and reproducing and bringing interrelated responses along with the changes of sandy soil water is the most essential key to exist under arid weather condition.The study select three desert plants, Ceratocarpus arenarius L. and Euphorbia turczaninowii Kar.et Kir and Salsola implicata Botsch which the wave of climate have less effect on them and the annual changes of the amount of vegetation is comparatively less as the research objects. Study on some adaptable properties when they are under rigor survival condition, whether the seedling can avoid death. The ways of the study are followed : inspecting and observing their living condition on the sand dune ; continuously mensurate the changes of sandy soil water ; cultivating sprout ; examining ecological and physiological changes in three plants and paraffin sectioning.The study results show : in the course of the changes of sandy soil water, the status of the three plants’ distributing and growth and the status of 0-20cm’s sandy layer containing water are notable correlation. Due to their modes to adapt to arid condition, ecological and physiological responses and the changes of structure are all different, but their mechanism to adapt to the sandy soil water changing is consistent, consequently they have more chances to exist in the entironment what has biggish annual wave of climate comparing to mostly plants that bourgeon in early spring. Ceratocarpus arenarius L. has the shortest living cycle in the three plants. It enhances absorbing and transporting water by earliest forming topmost the ratio of root and stem. It’s light-colored leaf and dense floss conduce to decrease irradiation of the sunlight and recede the leaf temperature, so as to reducing transpiration and improving status of inside water and gaining more chances to exist. Euphorbia turczaninowii Kar.et Kir effectively guarantee the transport of inside water and maintain upper water potential depending on it’s erect and sturdy stem. In the three plants, Salsola implicata Botsch is the lattermost efflorescing and seeding. But along with water content of sandy soil reducing, the steady amount of inside containing water seem to be concerned with developed keratose layer. This help to reduce transpiration consuming water and keep living in entironment being serious short of water

Mots clés : Ceratocarpus arenarius L.; Euphorbia turczaninowii Kar.et Kir.; Salsola implicata Botsch.; moisture content of dune; adaptability

Présentation (CNKI)

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