淹水调控对互花米草生长的影响

Effects of Waterlogging Regulation on Growth of Spartina Alterniflora

为了研究不同淹水深度和淹水时间胁迫下互花米草的适应能力,设置不同淹水深度(0,10和20 cm)与不同淹水时间(2,4,6,12和24 h/d)处理,以7～10 cm互花米草为试验对象,4个月后统计其生长发育参数与分蘖数,并测定地上部分的生物量.结果表明:①在淹水0,10和20 cm 3组试验之间呈极显著差异(P<0.01),随淹水深度的增加,互花米草分蘖数和地上生物量显著减少;②不同淹水时间各组之间株高呈极显著差异(P<0.01),随淹水时间的增加,互花米草分蘖数和地上生物量相应减少,且一直淹水于20 cm的互花米草全部死亡;③不同淹水时间、淹水深度对互花米草的影响大小主要表现为植株高度系数>叶片相关系数>无性生殖系数.持续淹水是控制互花米草的行之有效的物理措施.

In order to investigate the effects of waterlogging stress on Spartina alterniflora growth, five levels of waterlogging time treatment （2,4,6,12 and 24 h/d） and three levels of waterlogging depth treatment （0,10 and 20 cm） were configured. S. alterniflora seedlings with 7- 10 cm height were cultivated for experimentation. Responses of growth index, tiller number and aboveground biomass were determined over the course of four months. The results showed that ： （ 1 ） There was extremely significant differences among the waterlogging depth treatments 0,10 and 20 cm （ P 〈 0.01 ）. Tiller number and aboveground biomass decreased significantly with increased waterlogging depth. （2） There was extremely significant differences among waterlogging time treatments （P 〈 0.01 ）. Tiller number and aboveground biomass decreased along with increased waterlogging time, and all plants with 20 cm water depth and 24 h/d waterlogging died. （ 3 ） With waterlogging stress, S. alterniflora growth responded with the order of plant height coefficient 〉 leaves correlation coefficient 〉 asexual reproduction coefficient. Thus, persistent waterlogging treatment is an effective physical measure to control S. alterniflora growth.