两种木本植物光合作用对油页岩废渣污染的响应

比较油页岩污染点(茂名石化公司废渣场)和相对清洁点(茂名市林科所)生长的灌木翅荚决明(CassiaalataL.)和乔木乌墨(Syzygiumcumini(Linn.)Skeels)的光合生理指标的变化。在两个试验点,翅荚决明的净光合速率、气孔导度和蒸腾速率的绝对值在一天的多数时段均高于乌墨,但与对照点相比,在污染点翅荚决明的净光合速率和水分利用效率的下降幅度却大于乌墨,气孔导度则相反,可能与土壤含水量有关。结果表明乌墨的抗油页岩废渣污染能力强于翅荚决明。

Responses of Photosynthesis in Two Woody Plants to Oil Shale Residue Pollution

Changes in Photosynthetic parameters were examined of Cassia alata L.and Syzygium cumini(Linn.) Skeels grown on waste residue of oil shale from Maoming Petrochemical Company as polluted site,and at Maoming forestry institute as control site.Results showed that absolute values of net photosynthetic rate,stomatal conductance,and transpiration rate in C.alata,were higher than those in S.cumini at most hours in the daytime at both sites.Reductions in net photosynthetic rate and water use efficiency in C.alata.were greater than those in S.cumini,whereas,stomatal conductance was the contrary,which might be related to the water content in soil at different experimental sites.It was shown that S.cumini was more resistant to oil shale pollution than C.alata.More comprehensive physiological indexes in selecting pollution-resistant plant species are desirable.