中文摘要：

按照不同密度将互花米草与秋茄进行混种，对比研究胁迫条件下秋茄幼苗生长、光合特性及其渗透调节物质变化规律。结果表明，低密度互花米草促进秋茄的茎长以及各部分生物量，高密度则起抑制作用。随着互花米草密度的增大，秋茄幼苗叶片光合速率、气孔导度、蒸腾速率、水分利用率和蛋白含量均下降；相反，胞间CO2浓度、可溶性糖、淀粉、脯氨酸含量却上升，这些变化有利于对抗互花米草带来的不利影响。

英文摘要：

Kandelia candel seedlings were mix-cultured with Spartina alterniflora of different densities for 120 days, and their growth, photosynthetic characteristics as well as osmotic adjustment law were studied. The results showed that the stem height and biomass of K. candel seedlings were enhanced with low density S. alterniflora and inhabited with high density ones. With the density of S. alterniflora going up, Pn, Gs, Tr, WUE and protein content in K. candel seedlings decreased respectively. On the contrary, the content of sugar, starch, proline increased with the density of S. alterniflora increasing. These changes in the physiological properties helped K. candel seedlings to counteract the adverse effects from S. alterniflora.