求翻译：以水培的方法，对污染区、非污染区海州香薷的净光合速率（Pn）、气孔导度（Gs）、胞间CO2浓度（Ci）、气孔限制值（Ls）、叶绿素（Chl）等进行比较研究。是什么意思？

To water culture method, the contaminated areas, non-contaminated areas Elsholtzia splendens net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), stomatal limitation value (Ls), chlorophyll (Chl) other comparative studies.

The methods for water-bae, the contaminated areas, non-contaminated areas of the Sea, modify NET CD-hop rate (Pn stomata), actual degrees) brothers (Gs CO), 2 (Ci), concentration limit value (Ls stomata), such as chlorophyll (Chl) to conduct comparative studies.

Method cultivates which by the water, to pollutes the area, non-pollution area Zhugai fragrant ru only photosynthesis speed (Pn), blowhole leading (Gs), intercellular CO2 density (Ci), blowhole limit value (Ls), chlorophyll (Chl) and so on conducts the comparison research.

In the hydroponic way, polluted areas, non-contaminated areas NET photosynthetic rate of elsholtzia (Pn), stomatal conductance (Gs), intercellular CO2 concentrations (Ci), stomatal limitation value (Ls), chlorophyll a (Chl) for comparison.

In the hydroponic way, polluted areas, non-contaminated areas NET photosynthetic rate of elsholtzia (Pn), stomatal conductance (Gs), intercellular CO2 concentrations (Ci), stomatal limitation value (Ls), chlorophyll a (Chl) for comparison.