| There are about897million km2of saline soil in the world, which accounting for6.5%of the land. Itis seriously restricting the agricultural production, and also is one of the important factors affecting theecological environment. China has about a variety of soil salinization over250million hectares, and hasrising trend. Xinjiang is the largest area and the widest distribution of the saline alkali soil. Using thecompensatory growth of salt tolerant plants to improve saline, is of great significance for saline land andecological environment improvement in Xinjiang.In this study, Salicornia europaea，Suaeda salsa, Suaeda altissima and Atripex aucheri Moq wereplanted in the saline-alkali fields. Through two-years field experiments, we study different halophytes’sabsorption and accumulation characteristics of salt, ions, and nutrient elements, analysis the effects ofdifferent Halophytes to salt and ionic in different soil layer under drip irrigation condition. The mainlyconclusions as follows:1. The early growth stage of Salicornia europaea and the last growing stage of Suaeda salsa, Suaedaaltissima and Atripex aucheri Moq were the duration of vigorous accumulation period, when the netaccumulation accounted for more than89%of the total dry matter. In the final growth stage, the dry matteraccumulation of Atripex aucheri Moq and Suaeda salsa is lower than Suaeda altissima but higher thanSalicornia europaea.2. The content of salt and most ion of halophytes in the early growth preiod are higher than which inthe middle to late growth period. In the final growth stage, the salt accumulation of Atripex aucheri Moq islower than Suaeda altissima and Suaeda salsa but higher than Salicornia europaea. Salicornia europaeashowed stronger uptake capacity to Na+ã€Cl-than others, especially for Cl-, and all of them had stronguptake capacity to SO42-.3. N content of Suaeda salsa, K content of Suaeda altissima as well as the N and K contents of Atripexaucheri Moq continuously decreased with the advance of growth. The P content of the three halophytes andthe 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 Suaedaaltissima showed an increasing trend after an initial decrease, the N accumulation of Suaeda salsa andAtripex aucheri Moq, as well as the P and K accumulation of the three halophytes increasingly accumulatedwith the growth especially in the middle to late growth period.4. The total salt content of0-5cm layer decreased significantly in the early growth stage and the0-20cm layer also decreased significantly in the middle growth stage. In the final growth stage,0-5cm layerdecreased significantly but5-60cm layer increased. There are no unified rules of effects on salt ions ofdifferent layers by the halophytes in different periods, but from look on the whole, these halophytes have afunction to inhibit soil ion rise. Planting halophytes will drive water and salt movement of5-90cm soillayer. Through the halophytes’ treatment, the pH of saline soil was lower than CK. |
