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Lanzhou Jiaotong University (兰州交通大学) 2015

Spatial And Temporal Heterogeneity Research of Soil Moisture of Patches Vegetation in Desert Oasis Ecotone

樊立娟

Titre : Spatial And Temporal Heterogeneity Research of Soil Moisture of Patches Vegetation in Desert Oasis Ecotone

Auteur : 樊立娟

Grade : Master’s Theses 2015

Université : Lanzhou Jiaotong University (兰州交通大学)

Résumé partiel
The desert oasis ecotone in the middle reaches of Heihe river is located in the northwest arid area of inland China, In the backdrop of the global climate change, and under the control of special geographical position and climate environment, this research area the precipitation is scarce and distributed uneven with the season change, but evaporation is larger, so serious shortage of water resources is the most obvious environmental characteristics in arid regions. And it is one of major bottleneck restricting economic and social development in the region. natural vegetation show patch shape distribution pattern in this desert oasis ecotone. In recent years, along with the Heihe water diversion project implementation, industrial and agricultural water demand increased and destruction of human activities, this area appeared vegetation degradation, withered, even death phenomenon.And ecological environment gradually deteriorating,surface soil wind erosion is serious, surrounding the sandstorm frequency increasing. The fragility and instability of this ecological system, determines the status of soil moisture is an important ecological factor in this desert oasis ecotone. Soil moisture is the bond and central link between the earth and the atmosphere, participate in the water cycle, energy and momentum exchange land surface process, also is an indispensable and key parameter of the climate system and the ecological system. Especially in arid desert area, the soil moisture is a crucial indicator of soil condition, Affects the growth and recovery of vegetation, distribution pattern and evolution process, at the same time can reflect and explain the degree of soil wind erosion in a region.Soil moisture influenced by numerous factors, have a high degree spatial and temporal heterogeneity. The factors include the underlying surface types, climate, soil texture, topography, human activities and so on. This study used three methods from three different dimensions study the spatial and temporal heterogeneity of soil moisture in the middle reaches of Heihe desert oasis ecotone vegetation patches.

Mots clés : desert oasis ecotone ;patches vegetation ;soil moisture ;spatial and temporal heterogeneity ;

Présentation (CNKI)

Page publiée le 7 avril 2022