Abstract: Wetland vegetation biomass is a key factor to measure the fitness of wetland ecosystem. How to estimate biomass is one of the most hotspot topics in the wetland research. The general methods of estimating the vegetation aboveground biomass mainly depended on quadrat, which is limited when dealing with complicated wetland ecosystem. With the progress of remote sensing, the observation of wetland vegetation biomass has turned into a long-lasting, dynamic and largescale manner. After analyzing a large amount of related references, we illustrated theoretical basis and calculation principle of the estimation of wetland vegetation aboveground biomass, based on optical remote sensing image, SAR data, Lidar data and multisource, using remote sensing data as data source. We summarized the research progress, analyzed the applicability and limitation of the methods. Then, we described the developing trend in study on wetland vegetation biomass in several aspects, such as expanding the monitoring type of wetland vegetation biomass, integrating the multisource remote sensing data, assimilating the remote sensing data and developing the remote sensing mechanism models.

Key words: root-zone CO₂ concentration, tomato, photosynthetic physiology.