田间矿化水灌溉下小麦和甜菜的离子区隔化

通过田间灌溉试验,研究了矿化水灌溉下小麦和甜菜对离子的选择吸收及其区隔化.随着灌溉水中NaCl含量的增加,小麦茎、鞘、叶、颖的离子吸收的选择系数SK,Na逐渐降低,而根和籽粒的SK, Na逐渐增加.小麦和甜菜各器官的离子吸收的选择系数SCl、Na都随灌溉水中NaCl含量的增加而逐渐降低.小麦地上部各器官的SK, Na;SCl, Na都大于根;而甜菜叶的SK, Na大于根, SCl , Na在二者之中的差异不大,由于K+的再转移和分配,甜菜枯叶的Na/K大于叶.小麦和甜菜对离子的选择吸收和运输使Na 和Cl主要分布于对生长和产量影响最小的部分,即小麦的茎和鞘,甜菜的枯叶.

COMPARTMENTATION OF IONS IN WHEAT AND SUGAR BEET IRRIGATED WITH BRACKISH WATER UNDER FIELD CONDITIONS

The uptake selectivity, transport and compartmentation of ions in wheat and sugar beet irrigated with brackish water were studied under field conditions.S_K,Na (K/Na selectivity) increased gradually in the stem, sheath, leaf and husk of wheat but decreased gradually in the roots and seed of wheat and in the roots and leaves of sugar beet with increasing NaCl content in irrigation water.S_Cl,Na (Cl/Na selectivity) was reduced in the all parts of wheat and sugar beet with increasing NaCl content of irrigation water.S_K,Na and S_Cl,Na in the aerial parts were higher than those in the root of wheat but lower than or equal to those in the root of sugar beet.These results indicated that ion transport from root to aerial parts of wheat was much different from that of sugar beet.The selective uptake and transport of ions by wheat and sugar beet made Na and Cl distribute mainly in the parts, i.e., the stem and sheath of wheat and the dead leaves of sugar beet, which have little effect on their growth and yields.