毛乌素沙地优势种在高CO_2浓度条件下对土壤干旱胁迫的响应  

Responses of Some Dominant Species in Maowusu Sandland under High CO-2 Concentration to Drought Stress

作　　者：高素华[1] 郭建平[1] 

机构地区：[1]中国气象科学研究院,北京100081

出　　处：《水土保持学报》2002年第6期116-118,共3页Journal of Soil and Water Conservation

基　　金：国家重点基础发展规划项目(编号:G1999043400)资助

摘　　要：采用人工模拟试验方法研究了毛乌素沙地沙生植物群落优势种沙柳、油蒿、柠条、杨柴对高CO2浓度(700μmol/mol)和土壤干旱胁迫的响应。试验结果表明:CO2浓度升高,4种植物根、茎、叶的生物量均呈增加趋势;土壤干旱胁迫对4种植物都产生显著的不利影响,且均随干旱程度的加重负效应增加;在CO2浓度条件下,土壤干旱胁迫的不利影响依然存在,但与本底CO2浓度条件下相比,CO2的"施肥效应"依然存在;通过对4种植物生物量的比较,沙柳在高CO2浓度条件下对干旱较为敏感,柠条对CO2浓度升高更为敏感。Using the artificial experiment studied the response of soil drought stress and high CO2 concentration (700 μmol/mol)on some dominant species in Maowusu sandland plant community, such as Salix psammophila, A.Ordosica, Caragana Intermedia,and Hedysarum mongolicum Turcz. Results shown that the increasing of the CO2 concentration was in favor of the biomass increasing trend of the root, stem, leaf of the four species. Soil drought stress put remarkably adverse impact on all of them, and the negative impact increased with drought degree aggravating. Under the condition of high CO2 concentration, the negative impact was still existing, but compared with the condition of normal CO2 concentration, the 'fertilization function' was existing also. By the comparing, we found Salix psammophila was more hypersensitive and Caragana Intermedia was more hypersensitive relatively than others.

关 键 词：CO2浓度 干旱胁迫 沙柳 油蒿 柠条 杨柴 

分 类 号：S152.75[农业科学—土壤学] S154.4[农业科学—农业基础科学]