中文摘要：

以1年生浙江兰溪和福建漳浦种源乌桕为试验材料,研究不同淹水胁迫对乌桕生长及光合作用的影响。结果表明：浙江种源在各淹水处理下苗木未出现死亡,而福建种源在涝渍处理下苗木全部死亡,浙江种源的耐涝性较福建种源强;轻度淹水胁迫促进浙江种源苗木生长和光合作用,在涝渍胁迫下,高生长受到抑制,净光合速率、气孔导度、胞间CO2浓度均下降;各淹水胁迫下,福建种源苗高和地径生长及总生物量均受到明显的抑制,净光合速率、气孔导度显著下降,胞间CO2浓度则随着胁迫时间的持续逐渐升高。

英文摘要：

Growth status and photosynthesis of 1-year-old seedlings of two provenances of Sapium sebiferum（Zhejiang Lanxi Fujian Zhangpu） were investigated in a 50-day flooding and waterlogging experiment. The results showed： all plants of provenances of Zhejiang provenances the survived under different stresses,while all plants of Fujian provenances died under the flooding stress and waterlogging stress,and therefore the Zhejiang provenances were more tolerant to the stresser. The growth and photosynthesis of Zhejiang provenances were promoted under the mild water stress,while the height growth and biomass were inhibited and net photosynthetic rate,stomatal conductance and intercellular carbon dioxide concentration were inhibited under the severe water stress（flooding and waterlogging） ,although there appeared hypertrophied lenticels and adventitious roots on submerged portions of stems. Under flooding stress,the net photosynthetic rate and stomatal conductance of Fujian provenances were decreased,but the intercellular carbon dioxide concentration increased.