淡水水位对桐花树幼苗生长的影响

研究了不同淡水水位（0、1/4、2/4、3/4和4/4水位）对2月龄桐花树（Aegiceras corniculatum）幼苗生长的影响.结果表明，1/4和2/4水位提高了幼苗的生存率，幼苗的茎高、茎径生长和胚轴生长以及分枝数和叶片生长增加，而3/4和4/4水位抑制了幼苗的茎、叶片生长.过氧化物酶（POD）和超氧化物歧化酶（SOD）活性均随水位增大而呈显著升高的趋势，根系活力和可溶性糖含量却显著下降.试验表明，中低水位对桐花树幼苗的生长有促进作用，在3/4以上高水位下显著地受抑制幼苗的生长.

EFFECT OF DIFFERENT FRESH WATER-LOGGING LEVEL ON THE GROWTH AND PHYSIOLOGICAL CHARACTERISTICS OF AEGICERAS CORNICULATUM SEEDLINGS

The effects of different fresh water depths (0, 1/4, 2/4, 3/4 and 4/4) on the growth of 2-month old Aegiceras corniculatum seedlings were investigated. Results showed that the 0, 1/4 and 2/4 water depths increased seedling height, stem diameter, cotyledon length, numbers of branch and leaf, and the survival rate of seedlings; whereas 3/4 and 4/4 water depths significantly inhibited the stem and leaf growth of the seedlings. Superoxide?dismutase (SOD) and peroxidase (POD) activities in leaves and roots increased significantly with increased water levels, whereas root vitality and soluble sugar significantly decreased as water level increased. It is concluded that the growth of A. corniculatum seedlings was enhanced by water levels lower than 2/4, but significantly retarded by water levels higher than 3/4.