Abstract：Based on the saline content and composition of the soda saline soil in Heilongjiang and other
Provinces，this experiment simulated its saline composition，adopted pot culture，grafted cucumber（ Cucumis
sativus） seedlings onto 2 salt-tolerant rootstocks，and 2 salt-sensitive rootstocks as experimental materials. Ownroot
seedlings were taken as the contrast. Saline solution（100 mmol·L-1，pH 9.0） was used to treat the soil. We
studied the effects of salt stress on growth and soil enzyme activities of cucumber seedlings grafted on these different
rootstocks. The results indicated that the yield per plant，the ground fresh weight，the root fresh weight，the plant
height and the chlorophyll content of cucumber seedlings grafted on 2 salt-tolerant rootstocks were significantly
higher than that of the 2 salt-sensitive rootstocks and own-root cucumber. The soil urease，neutral phosphatase
activities after transplanted 30 d and the catalase，dehydrogenase activities after transplanted 40 d of cucumber
seedlings grafted on salt-tolerant rootstocks were higher than that of salt-sensitive rootstocks and own-root plants.
These 4 kinds of soil enzyme activities of cucumber seedlings grafted on salt-tolerant rootstocks after transplanted
50 d were all higher than that of salt-sensitive rootstocks and own-root cucumber. Under soil salinization
condition，cucumber seedlings grafted on salt-tolerant rootstocks grew robustly and suffered low degree of salt
injury. That account for that graft can significantly improve cucumber salt resistance； the resistance enhancement of
cucumber seedlings grafted on salt-tolerant rootstocks is closely related to the increase of soil enzyme activity.
