摘要
选择毛乌素沙地优势灌木中间锦鸡儿为研究对象 ,人为控制 4种降水量水平来测定中间锦鸡儿幼苗的形态、生物量干重、气体交换和叶绿素荧光参数 .结果表明 ,不同施水量显著影响幼苗株高、基径、叶数、叶面积、生物量干重、净光合速率、蒸腾速率、气孔导度以及水分利用效率 .15 7.5mm和 63 0mm施水的幼苗以上参数显著低于 472 .5mm施水的幼苗 ;15 7.5mm和 63 0mm施水量的幼苗PSII光化学效率和最大荧光与初始荧光比显著小于 472 .5mm施水量的幼苗 ;不同施水量对幼苗生物量干重分配有显著影响 ,随着施水量增加 ,根冠生物量干重比显著减小 .
Morphology, biomass, gas exchange and chlorophyll fluorescence were measured for seedlings of C.intermedia ,a dominant shrub, to the change of global precip ita tion by artificially controlling the water supply at four levels. The results sh owed that the seedling variables, such as plant height, stem diameter, leaf numb er, leaf area and dry biomass, photosynthetic rate, transpiration rate, stomatal conductance, and water use efficiency, were affected by different water supply, and those variables of the seedlings treated by the 157.5mm or 630mm water supp ly were significantly less than those of the seedlings treated by the 472.5mm wa ter supply. PSII photochemical efficiency and maximal fluorescence/initial fluor escence of the seedlings treated by 157.5mm and 630mm water supply were much sig nificantly lower than those of the seedlings treated by 472.5mm water supply. Wa ter supply obviously affected dry biomass distribution of the seedlings, and the root / shoot dry biomass clearly decreased with the increase of water supply.
出处
《应用生态学报》
CAS
CSCD
2001年第5期692-696,共5页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 (G1 9990 4 340 7)
中国科学院知识创新工程项目 (KSCW2 1 0 7)
国家自然科学基金重点资助项目(498350 1 0 )
