酸雨胁迫对亚热带典型树种幼苗生长与光合作用的影响

Research on the growth and photosynthesis of typical seedlings in subtropical regions under acid rain stress

通过对酸雨胁迫下中国亚热带典型针叶树和阔叶树,马尾松(Pinus massoniana Lamb.)、杉木(Cunninghamia lanceolata(Lamb.)Hook.)、甜槠(Castanopsis eyrei(Champ.)Tutch.)、苦槠(Castanopsis sclerophylla(Lindl.)Schott.)幼苗的光合生理研究,试图判断日益严重的酸雨是否会对中国亚热带森林产生影响,以便更好地对已退化的森林进行恢复。试验结果表明:在酸雨胁迫下,甜槠和杉木幼苗的高生长受到的影响不显著,而对马尾松幼苗的高生长有一定的促进作用;在pH4.0时,酸雨胁迫对甜槠、杉木和马尾松幼苗的地径生长有一定的促进;在不同酸雨处理下,苦槠、甜槠和马尾松幼苗的最大净光合速率随着酸雨浓度的增加而下降,说明这3种植物幼苗的光合能力受到影响,特别是阔叶树幼苗,苦槠和甜槠幼苗的最大净光合速率分别下降了30%和25%。

This paper researches the effects of acid rain stress on photosynthetic and physiological characters of typical seedlings（Pinus massoniana Lamb.,Cunninghamia lanceolata （Lamb.） Hook., Castanopsis eyrei （Champ.） Tutch., Castanopsis sclerophylla （Lindl.） Schott.）in subtropical regions of China. Judging increasingly serious acid rain would affect forest in subtropical regions of China, in order to restoring degenerate forest better. The results show that under acid rain stress, the height growth of C.eyrei,P. Massoniana is influenced slightly, while it will promote the height growth of P. Massoniana. In the treatments with pH4.0, the diameter growth of C.eyrei,P. Massoniana,C.lanceolata have been increased. With increased of acid rain concentration, the photosynthetic rate （Amax） of C.sclerophylla,C.eyrei,P. Massoniana is decreased under different acid rain treatments, it shows that photosynthetic capacity of this three seedlings have been affected already, especially the broad-leaved species, the highest maximum photosynthetic rate （Amax） of C.sclerophylla, C.eyrei reduced by 30% and 25% under acid rain stress respectively.