摘要
使用Li-6400Q光合仪对黄土高原水蚀风蚀复合区河北杨、小叶杨、山杏、山桃、柠条、沙棘6树种光合生理生态指标及环境因子进行了测定。结果表明:所测定6种树种光饱和点均较高,较适应当地高光强环境,乔木光补偿点低于灌木,乔木对光能利用率较高。所测定树种净光合速率日变化沙棘呈双峰曲线,其它为单峰型曲线,日进程受自身和环境因素综合或交错控制。气孔导度和胞间CO2浓度日变化规律性明显,乔木的较灌木的高,且日变化相对稳定。所测定树种蒸腾速率日变化节律明显,日平均蒸腾速率沙棘、山杏、山桃较低,而河北杨、小叶杨和柠条的较高。同时测定树种日平均水分利用效率沙棘、山杏、山桃较高,而河北杨、小叶杨和柠条的较低。
The paper aimed to study the characteristics of photosynthetic rate, the transpiration rate and their correlations with the environmental factors of Populus hopeiensis, P. sirnonii, Persica davidiana, Armeniaca ansu, Caragana spp. , and Hippophae rhamnoides in the mixed area with both water and wind erosion in the Loess Plateau by using Li-6400Q Photosynthesis system. The results indicate that the light saturation points of the six species are so high that they can adapt to the local high lighted climate. The light compensation points of trees are lower than those of the shrubs. The light use efficiency of trees is higher. The diurnal course of net photosynthetic rate of H. rhamnoides is double-peak while the diurnal course of net photosynthetic rate of other species is single-peak. And the process is controlled -by environmental factors and their physiological functions. The aver- age of diurnal net photosynthetic rate of two poplar trees is 13.8% higher than that of others. The diurnal course of stomatal conductance and intercellular CO2 concentration for 6 tree species significantly change. The stomatal conductance and intercellular CO2 concentration of trees are higher than shrubs. And the change is relatively stable. The transpiration rate of six species change significantly. The transpiration rate of two poplar trees is significantly higher than that of other species. The water use efficiency of P. hopeiensis, P. simonii and C.
基金
"十一五"国家科技支撑计划课题(2006BAD09B06)
水利部"948"项目(200207)资助
关键词
沙棘
其他树种
光合生理特性
the Loess Plateau
wind photosynthetic characteristics spp. are lower than that of the other three species water erosion region
artificial vegetations
