Abstract: Soil salinization is one of the important factors influencing the ecological and environmental, which severely restricts the agricultural production. Biological improvement of saline-alkali land is an effective method of using salt absorption characteristics of salt-tolerant plants to govern salinization, which has important significance for the improvement of saline-alkali land and ecology environment. Artificial planting halophyte is an effective way to improve and utilize the saline soil resource, while it is the basis for land improvement to understand the nutrient absorption characteristics of halophyte. Suaeda salsa, Suaeda altissima and Atripex aucheri were grown by the artificial planting method to study the characteristics of dry matter accumulation and the nitrogen (N) absorptions, phosphorus (P) and potassium (K). Results showed that the vigorous dry matter accumulation period of Suaeda salsa, Suaeda altissima and Atripex aucheri were in last growing stage, when the net accumulation accounted for 96.42%, 96.76%, and 93.29% of the total dry matter, respectively. The contents of N, P and K concentrations were significantly different (P<0.05) among the three halophytes and different growth periods. N content of Suaeda salsa, K content of Suaeda altissima as well as the N and K contents of Atripex aucheri continuously decreased with the advance of growth. The P content of the three halophytes and the N content of Suaeda altissima showed an increasing trend after an initial decrease, while the K content of the Suaeda salsa increased at first and then decreased. Except for the N accumulation of Suaeda altissima showed an increasing trend after an initial decrease, the N accumulation of Suaeda salsa and Atripex aucheri,as well as the P and K accumulation of the three halophytes increasingly accumulated with the growth especially in the middle to late growth period.

Key words: halophytes, salinity soil, nutrient, content, dry matter accumulation