Influence of short-term experimental warming on heat-waterprocesses of the active layer in a swamp meadow ecosystemof the Qinghai-Tibet Plateau

作     者：GuangSheng Liu GenXu Wang 

作者机构：College of Environmental Science and EngineeringXiamen University of TechnologyXiamenFujian 361024China Key Laboratory of Mountain Surface Processes and Ecological RegulationInstitute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduSichuan 610041China 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2016年第8卷第2期

页      面：125-134页

核心收录：

学科分类：090503[农学-草业科学] 0909[农学-草学] 0905[农学-畜牧学] 09[农学] 0705[理学-地理学] 0903[农学-农业资源与环境] 

基　　金：funded by The Natural Science foundation of China (No. 40925002) The Natural Science foundation of Fujian Province (No. 2015J05114) 

主　　题：experimental warming open top chamber Qinghai-Tibet Plateau soil moisture soil temperature alpine swamp meadow ecosystem 

摘      要：Climate change is now evident in the Qinghai-Tibet Plateau(QTP), with impacts on the alpine ecosystem, particularly on water and heat balance between the active layer and the atmosphere. Thus, we document the basic characteristics of changes in the water and heat dynamics in response to experimental warming in a typical alpine swamp meadow ecosystem. Data sets under open top chambers(OTC) and the control manipulations were collected over a complete year. The results show that annual(2008) air temperatures of OTC-1 and OTC-2 were 6.7 °C and 3.5 °C warmer than the control. Rising temperature promotes plant growth and development. The freeze-thaw and isothermal days of OTCs appeared more frequently than the control, owing to comparably higher water and better vegetation conditions. OTCs soil moisture decreased with the decrease of soil depth; however, there was an obviously middle dry aquifer of the control, which is familiar in QTP. Moreover, experimental warming led to an increase in topsoil water content due to poorly drained swamp meadow ecosystem with higher organic matter content and thicker root horizons. The results of this study will have some contributions to alpine cold ecosystem water-heat process and water cycle under climate change.