Abstract: The typical plant species of Tamarix ramosissima,Halocnemum strobilaceum, Halostachys caspica, and Phragmites australisin the oasisdesert transitional zone in the northern margin of Tarim Basin were the objects of this study. According to field survey data, models for estimating aboveground biomass of the four plant species were constructed using single factors, such as crown width and plant height, and their derivative factors as independent variables. After that, the accuracy of the models was verified. Compared with plant height, crown width of Tamarix ramosissima, Halocnemum strobilaceum, and Halostachys caspica had greater effects on aboveground biomass, while plant height of Phragmites australis had a greater effect on aboveground biomass. The correlation of compound variables to aboveground biomass was higher than that of single variables (P<0.01). The optimal models of aboveground biomass of Tamarix ramosissima, Halocnemum strobilaceum, and Halostachys caspica were S-curve models, and the optimal model of aboveground biomass of Phragmites australis was cubic curve model, with the value of R² being 0.591, 0.623, 0.754 and 0.640, respectively. The regression effects of the estimated models were extremely significant (P<0.001). Estimating aboveground biomass of desert ecosystems in the northern margin of Tarim Basin by constructing the prediction model of aboveground biomass of typical plants is important, which could provide a theoretical reference for biomass estimation of other desert plant species, the control of land desertification and the study of carbon storage in the northern margin of Tarim Basin.

Key words: pesticide residue., Yellow River Delta, rice-duck mutualism, organic agriculture, rice, rice quality