不同红树植物和湿地植物根部渗氧特征研究

Characteristics of radial oxygen loss from roots of different mangrove and wetland plants

以温室培养的不同种类红树植物和湿地草本植物为研究对象,分别通过柠檬酸钛(III)比色法和圆筒状铂电极测定法测定植物根部的渗氧量和渗氧方式。试验结果表明:6种红树植物和5种湿地草本植物的根部渗氧量都表现出明显的种间差异;6种红树植物的渗氧方式均为"完全屏障",而5种草本植物具有两种不同的渗氧方式,即"完全屏障"和"部分屏障";采自环境污染区的红树林植物幼苗的渗氧量和渗氧方式有改变的趋势。

To investigate the characteristics of Radial Oxygen Loss （ROL） from roots of wetland plants, different species of mangrove and herbaceous wetland plants incubated in greenhouse were collected for comparison. The ROL amount and ROL pattern were measured using methods of titanium （III） citrate buffer and root-sleeving cylindrical platinum O2 electrodes, respectively. The results showed that there were significant interspecies-differences among different mangrove and wetland plants. It was also found that the ROL pattern was ＂tight barrier＂ in all six mangrove species but ＂partial barrier＂ and ＂tight barrier＂ in different herbaceous wetland species. Furthermore, the environmental pollutants might induce the ROL and its pattern by comparing the mangrove seedlings collected from contaminated and clean sites.