摘要
采用人工模拟试验方法研究毛乌素沙地沙生植物群落的优势种———油蒿在高浓度CO2 条件下对土壤干旱胁迫的反应。结果表明 ,不同程度的土壤干旱胁迫使油蒿生长与生物量下降 ,随着干旱程度的加重而增加负面影响 ;大气中CO2 浓度升高对油蒿的生长发育起到“施肥作用” ;虽然在高浓度CO2 条件下发生土壤干旱胁迫对油蒿的影响也是负效应 ,但CO2 的“施肥效应”依然存在 ,“施肥效应”的生理机理是CO2 浓度升高提高了光合作用速率。
Using the modelling experiment, the responses of soil drought stress on A. ordosica, a dominant species of Maowusu sandland plant community, under high concentration of CO 2 carried in green house,is studied. Maowusu sandland is a typical one of arid and semi-arid sandland in China. Water is the most limited factor to A. ordosica growth and development. The results show that the different scales of soil drought stress made the growth and biomass of A. ordosica to be decreased, and the negative impact increased with the drought degree aggravated. The increase of atmospheric CO 2 concentration can be treated as a function of ″fertilization″ for growth of A. ordosica. Although, the impact of high concentration of CO 2 and soil drought stress on A. ordosica was negative, there existed still the ″fertilization function″ .Its physiological mechanism is that the CO 2 concentration increasing promoted the photosynthesis rate.
出处
《气象》
CSCD
北大核心
2002年第11期7-10,共4页
Meteorological Monthly
基金
国家重点基础发展规划项目"我国生存环境演变和北方干旱化趋势预测研究"(G1999043400)资助
