摘要
通过对川西亚高山森林优势种高山柳(Salix paraqplesia)、岷江冷杉(Abies faxoniana)和缺苞箭竹(Fargesia denudata)幼苗光合生理参数的测定,研究了它们净光合速率(Pn)、气孔导度(Cond)、蒸腾速率(Tr)和水分利用效率(WUE)对大气CO2浓度倍增(720μmol·mol-1)的响应。结果显示:CO2浓度倍增对3个物种的Pn有不同程度的促进作用,高山柳、岷江冷杉和缺苞箭竹最大净光合速率分别提高30%,81%和68%,岷江冷杉提高幅度最大。CO2浓度倍增与对照CO2浓度(360μmol·mol-1)相比各物种Cond、Tr和WUE升降不一。反映出不同物种幼苗对CO2浓度倍增响应的复杂性。作为川西亚高山森林优势种,高山柳、岷江冷杉和缺苞箭竹对CO2浓度升高的不同响应势必影响其生长和未来物种间的竞争,进而影响群落的组成和物种的多样性,甚至可能引起群落演替发生变化。
The responses of photosynthetic physiology parameters including net photosynthesis （Pn）, stomatal conductance （COND）, transpiration （Tr） and water use efficiency （WUE） ofSalix paraqplesia, Abiesfaxoniana and Fargesia denudata to doubled CO2 concentration were investigated, which were the dominant species of subalpine forest in the west of Sichuan. The results showed that： the three species displayed variable degrees of enhancement in net photosynthetic rates to doubled CO2,. the maximal net photosynthetic rate（P_max） increased by 30%,81% and 68% respectively,with CO2 concentrations leveled from ambient to double ambient. The response ofCOND, TR and WUE to the doubled CO2 concentration was also species dependent. These reflected the responsive complexity of seedlings of different species to doubled CO2 concentration. As the dominant species of Subalpine Forest in the west of Sichuan, the different responses of Salix paraqplesia, Abies faxoniana and Fargesia denudata to elevated CO2 concentration will influence their growth and competition between species in future so as to community composition and species diversity, and even probably result in the change of community succession process.
出处
《生态环境》
CSCD
北大核心
2008年第4期1514-1517,共4页
Ecology and Environmnet
基金
国家自然科学基金项目(90511008)
中芬国际合作项目(30211130504)
中国科学院"百人计划"资助项目(01200108B)
中国博士后科学基金项目(20060400636)
关键词
川西亚高山
优势树种
CO2浓度倍增
光合生理响应
subalpine in the west of Sichuan
dominant species
doubled CO2 concentration
photosynthetic physio-response
