摘要
不同土壤型羊草（Ａｎｅｕｒｏｌｅｐｉｄｉｕｍ ｃｈｉｎｅｎｓｅ）的光合和蒸腾作用特性有所不同。当土壤由湿变干时，差异最为显著的是光饱和光合速率和最大蒸腾速率的降低率。典型栗钙土型比暗栗钙土型和盐化草甸土型羊草的光合速率下降幅度小；其蒸腾速率下降幅度比其他两种类型大。因此，典型栗钙土型羊草在土壤干旱条件下光能利用效率和水分利用效率均较高，对干旱的适应性较强。这些差异表明，在自然条件下。
The most striking difference in the characteristics of photosythesis and transpiration in Aneurolepidium chinense of different soil types was declined ratio of photosynthetic rate at light saturation point and maximum transpiration rate when the sufficient soil moisture became deficit.The declined range of photosynthesis in A.chinense of typical chestnut soil type was smaller than that of dark chestnut soil type and saline meadow soil type, but its declined range of transpiration was larger than that of the other two soil types.Therefore, using efficiency of solar energy and water of A.chinense of typical chestnut soil type was all higher at soil drought condition and adapitability itself to drought was stronger.These differences indicated that different edaphic ecotype of A.chinense can exist in natural condition.
基金
中国科学院内蒙古草原生态系统定位站研究课题
