中文摘要：

为了研究高寒区植物生长过程对主要全球气候变化因子[如环境CO2浓度加倍（EC）、环境温度升高（ET）]及其二者组合（ECT）条件下的响应和适应，在青藏高原东缘岷江上游中部的中国科学院成都生物研究所茂县生态站[A（E）103^o53’，φ（N）31^o41’，海拔1820m]建立了一组全封闭的生长室系统．系统由6个独立、自控、封闭的生长室和2个对照组成．本文首先描述了生长室系统的结构和控制原理，然后基于2004年的运行结果，分析了系统的各项指标特征．结果表明：（1）EC和ECT生长室内的CO2浓度在650～800μmol mol^-1之间的时间分别占91．32％和91．67％（目标CO2浓度=环境CO2浓度加倍）；（2）ET和ECT生长室内空气温度升高1．0～3．5℃的时间分别占95．06％和88．73％（目标温度=现行环境温度＋2℃）；（3）生长室内太阳辐射和光合有效辐射强度减少20％～40％的时间分别占90．42％和89．43％．生长室系统能够提供多种与自然环境变量较一致的环境条件，也能提供长期的、稳定的目标环境变量．是研究高寒区植物生长过程对全球气候变化响应和适廊的有效模拟实验系统．

英文摘要：

Chamber system that consists of eight independent, self-controlled and enclosed-top chambers has been developed and set up in the Maoxian Mountain Ecological Research Station （ 103^o53＇E and 31^o41＇N, 1 820 m above sea level and belonging to Chengdu Institute of Biology, Chinese Academy of Sciences） in the upper reaches of the Yangtze River on the eastern part of the Qinghai - Tibet Plateau. The main objectives of the enclosed-top chambers system were to provide a means of assessing the medium to long-term effects and adaptations of global climate change [ for example, elevated atmospheric CO2 concentration （EC）, elevated temperature （ET） and interaction （ECT） ] on plants growth process at community level. In this experiment the target CO2 concentration in the EC and ECT chambers was set at doubling ambient CO2 concentration, and the target air temperature in the ET and ECT chambers to track the ambient temperature but with a specified addition （ ＋ 2.0 ℃ ）. Chamber performances were assessed based on the recordings data in 2004. The CO2 concentration and temperature control in these enclosed-top chambers were in general accurate and reliable. The CO2 concentrations in the EC and ECT chambers were within 650 - 800 μmol mol^-1 for 91.32% and 91.67% of the exposure time. The elevated air temperatures in ET and ECT chambers were within 1.0 - 3.5℃ for 95.06% and 88. 73% of the exposure time, respectively. There were some significant chamber effects. Solar radiation and PAR in the chamber were reduced by 20% - 40% for 90. 42% and 89.43% of the exposure time, respectively. So the enclosed-top chambers system can provide a wide variety of climatic conditions that are similar to natural regimes under high-frigid conditions in southwestern China.