SO_2暴露方式与油松生长的关系

Relationship Between SO_2 Exposure Mode and Chinese Pine Growth

苗龄为 87d的油松 (PinustabulaeformisCarr )于 2 0 0 2 0 7 0 1～ 0 8 2 9在 3个处理组进行SO2 暴露实验 6 0昼夜 ,处理 1和处理 2在 2 4h中SO2 浓度分别为 0 1mg·m-3 和 0 2mg·m-3 ,处理 3每日 6hSO2 浓度为 0 5mg·m-3 ,18hSO2 浓度为 0 1mg·m-3 .经SO2 暴露后 ,处理 1油松针叶气孔保卫细胞、针叶颜色未见异常 ;叶绿素含量、类胡萝卜素含量、光合速率、蒸腾速率、单株干重、相对生长速率与对照组无显著差异 ;但针叶含硫量比对照增加 17% ,从针叶渗出的钾离子量比对照增加 2 2 % .处理 2油松气孔保卫细胞、针叶颜色未见异常 ;叶绿素含量、光合速率、蒸腾速率与对照组无显著差异 ;类胡萝卜素含量下降5 % ,针叶含硫量增加 92 % ,从针叶渗出的钾离子量比对照增加 6 7% ,单株干重下降 4 5 % ,相对生长速率下降 0 6mg·(g·d) -1.处理 3油松气孔保卫细胞、针叶颜色发现异常 ;叶绿素含量与对照组相似 ,但类胡萝卜素含量下降 2 1% ,含硫量增加 10 4 % ,从针叶渗出的钾离子量比对照增加 89% ,光合速率下降 5 % ,蒸腾速率增加 8% ,单株干重下降 7 6 % ,相对生长速率下降 1 3mg·(g·d) -1.

Chinese pine seedling, which age is 87 days, are exposed to SO 2 in three treatments for 60 days from July 1, 2002 to August 29, 2002. In treatment 1 and treatment 2, the concentration of SO 2 were 0.1 mg·m -3 and 0.2 mg·m -3,respectively. In treatment 3, the concentration of SO 2 were 0.5 mg·m -3 for 6 hours and 0.1 mg·m -3 for 18 hours per day. In treatment 1, the abnormity of stomata guard cell and leaf colour are not observed. There are no significant difference of chlorophyll content, carotenoid content of leaf, photosynthetic rate, transpiration rate, relative growth rate, and dry weight per plant compare with control, but the sulfur content of leaf increased 17% compare with control, the amount of potassium ion leaching from leaf increased 22% compare with control. In treatment 2, the abnormity of stomata guard cell and leaf colour are not observed. There are no significant difference of chlorophyll content, photosynthetic rate and transpiration rate compare with control. But compare with control, the carotenoid content of leaf decreased 5%, and the sulfur content of leaf increased 92%, the amount of potassium ion leaching from leaf increased 67%, dry weight decreased 4.5% per plant, the relative growth rate decreased 0.6 mg·(g·d) -1. In treatment 3, the abnormity of stomata guard cell and leaf colour are observed. The chlorophyll content were similar with control, but compare with control, the carotenoid content of leaf decreased 21%, and the sulfur content of leaf increased 104%, the amount of potassium ion leaching from leaf increased 89%, photosynthetic rate decreased 5%, transpiration rate increased 8%, the dry weight decreased 7.6% per plant, the relative growth rate decreased 1.3mg·(g·d) -1.