STUDIES ON THE ADAPTAEITY AND TO LERANCE OF LEYMUS CHINENSIS TO SALINITY IN SALINIZED GRASSLAND IN THE SONGNEN PLAIN Effects of NaCl Stress on the Inorganic Ion Contents in Atriplex undulata Roots and Leaves A study on the characters of content of inorganic ions in salt-stressed Suaeda salsa Acid Buffering Capacity of Forest Litter from Some Important Plantation and Natural Forests in South China Effects of Salt and Water Stresses on Osmotic Adjustment of Suaeda salsa Seedlings Effect of exogenous NO on the growth and inorganic ion content of Festuca arundinacea seedlings under Pb2+ stress Studies on the Adaptability and Tolerance of Puccinellia tenuiflora to Salinity in the Salinized Grassland in Songnen Plain