酸雨、遮阴胁迫对加拿大一枝黄花光合生理特征的影响

通过对加拿大一枝黄花进行全光照(对照组)、33%遮阴(透光率约为(66±10)%)及66%遮阴(透光率约为(33±5)%)3种遮阴处理;酸雨pH值梯度为3.5、4.5、5.5及对照组(自来水,pH约为6.5)的胁迫处理,研究这两种逆境胁迫对其光合速率、蒸腾速率、水分利用率等生理特征的影响。结果表明:(1)不同pH值的酸雨处理的加拿大一枝黄花,其叶片净光合速率间存在显著差异,且随着模拟酸雨溶液酸度的逐渐增加,其光合速率持续降低;(2)随着模拟酸雨溶液酸度的增加,其叶片蒸腾速率持续降低;(3)加拿大一枝黄花在pH4.5时的水分利用率显著增大,表现出对酸雨较强的耐受能力;(4)加拿大一枝黄花的蒸腾速率在全光照的情况下要明显高于其他两组.

Effects on Photosynthetic Physiological Characteristics of Solidago Canadensis Under Acid Rain or Shading Stress

We studied on the photosynthetic characters of Solidago Canadensis,such as net photosynthetic rate,transpiration rant,and water use efficiency,under 3shading treatment of full light(control group),33% shading(light transmittance was about(66±10)%)and 66% shading(light transmittance was about(33±5)%);and under acid rain gradient,which pH values were 3.5,4.5,5.5and the control group(pH was about 6.5).The results showed that:1.Its photosynthetic rates continued to decrease with the increasing of acid rain solution acidity,and there were significantly difference among groups;2.its transpiration rate continued to reduce with the increasing of acidity,too;3.its water use efficiency significantly increased in pH4.5,showed strong tolerant ability to acid rain;4.its transpiration rates under full light was significantly higher than the other two.