摘要
利用便携式光合气体分析系统(LI-6400),从全球变化的角度分析华北山地阳坡灌草植被群落中5种具有代表性的植物光合特征对CO2浓度和温度变化的响应。结果表明:随着温度的升高,狗尾草Setaria viridis和龙牙草Agrimonia pilosa净光合速率呈明显增大趋势,在华北山地阳坡灌草群落中具有较强的竞争力,而达乌里胡枝子Lespedeza davurica的净光合速率对CO2的响应值降低,在环境温度升高的条件下不利于其光合产物的积累。
From the aspect of global climate change, grass-shrub vegetation response to the change of CO2 concentration and temperature in mountains of north China was analyzed with LI-6400 portable photosynthesis system. The results showed that the Pn of Setaria viridis and Agrimonia pilos increased with the increasing temperature, and had stronger competition ability among the vegetation. But Pn of Lespedeza davurica decreased with the increase of temperature. Increasing temperature was disadvantageous for accumulation of photosynthetic matter.
出处
《草业科学》
CAS
CSCD
2008年第4期135-140,共6页
Pratacultural Science
基金
北京市科学技术委员会项目(D0605046040191)
国家环境保护公益项目(200709029)
关键词
光合特性
CO2浓度
温度
灌草植被
photosynthetic characteristics
CO2 concentration
temperature
grass-shrub vegetation
