生态脆弱带不同区域近缘优势灌木的生理生态学特性  

Ecophysiological characteristics of kindred dominant shrubs in different areas of ecologically vulnerable zone

作　　者：周海燕[1] 张景光[1] 李新荣[1] 王新平[1] 赵亮[2] 龙利群[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙坡头开放试验站,兰州730000 [2]兰州大学干旱农业生态实验室,兰州730000

出　　处：《生态学报》2005年第1期168-175,共8页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划资助项目 ( G2 0 0 0 0 4870 4) ;国家自然科学基金资助项目 ( 90 2 0 2 0 15 )~~

摘　　要：小叶锦鸡儿、中间锦鸡儿和柠条锦鸡儿分别为中国北方生态脆弱带典型区域——科尔沁沙地、毛乌素沙地和腾格里沙漠的优势灌木。为了探讨生长在地理位置相距很远的不同气候类型区、但亲缘关系较近的沙漠植物种之间特性的差异及近缘种间引种成功的可能性 ,对 3种灌木在原产地和引种地 (腾格里沙漠 )的气体交换、叶绿素荧光参数、β胡萝卜素和脯氨酸累积等特性进行了对比研究 ,结果显示 :各区优势灌木的气体交换特征不同 ,主要依照区域光照和温湿条件的不同组合而变化 ,各区域的环境条件组合最利于其建群种的生长 ;引进种对引种地环境变化的反应调节较乡土种敏感 ;地理位置相距较近的近缘种间生理特性相近 。Caragana microphylla Lam, Caragana intermedia Kuang et H.C.Fu and Caragana korshinskii Komar are dominant shrubs in three typical regions of the ecologically vulnerable zone in northern China-Horqin sandy land, Mu Us sandy land and Tengger desert, respectively. In order to understand the differences in characteristics of desert plant species with close genetic relationship but in different climatic zones that are far away from each other in geographic location and to explore the possibility for successful introduction of kindred species, a comparative study was conducted on gas exchange characters, chlorophyll fluorescent parameters, βcarotin content and proline accumulation rate of these three species in their native habitats and introduced area (Tengger desert). The results show that dominant shrubs of different regions had different gas exchange features, which varied with the interplay between light intensity, temperature and humidity of the regions. The environmental conditions specific to each region were most favourable for its dominant shrub. Introduced species were more sensitive to the environmental changes of new place than local species, and kindred species from adjacent distribution regions displayed similar physiological properties and, therefore, can be successfully introduced.

关 键 词：生态脆弱带 干草原 荒漠草原 草原化荒漠 小叶锦鸡儿 中间锦鸡儿 柠条锦鸡儿 生理生态学特性 

分 类 号：Q945[生物学—植物学]