|
Different Ages of vetiver (Vetiveria zizanioides, name vetiver) , different depths of waterlogging , morphological and physiological changes and waterlogging vetiver in flooded conditions . The main findings are as follows : 1 . The potted Vetiver experiment : fully flooded state vetiver stop growing , but still maintain a longer period of survival in summer for about 3 months , winter for about five months . Vetiver can be a gradual return to growth after the withdrawal of water . 2. Flooding significantly inhibited the vetiver root length , seedling age the smaller flood the deeper , more intense suppression . Flooded conditions , vetiver root hairs significantly reduced root color with inundation depth increases darken . But the flood of vetiver root biomass of different long - term flood material measurement results show that moderate flooding can promote increased root biomass and depth of flooding increased inhibition of root biomass . 3. Flooded conditions , of vetiver ground part changes also showed a certain degree of adaptability . Moderate flooding stimulus vetiver tillers hyperplasia , aboveground biomass was no significant difference compared with the control , and depth of flooding suppression vetiver tillers and aboveground biomass . In addition , under waterlogged conditions the Vetiver plant height lower than the control group . 4. The flood group vetiver net photosynthetic rate , stomatal conductance , transpiration rate and chlorophyll content than the control group , and with the flood depth increases and higher . Flooded conditions , the old root activity was increased and then decreased , two weeks after the flooding group began to grow new roots and new root vigor higher than that in the control group root vigor . 5. Determination of vetiver waterlogging indicators show that flooding vetiver CAT activity increased SOD activity was essentially the same , MDA content slightly accumulated , but no significant change in membrane permeability . In short , under flooded conditions vetiver morphological and physiological appear adaptive changes waterlogging highly with amphibious characteristics may be considered volatile areas the water level of the reservoir bank , riparian planting .
|