Effects of Low Phosphorus Stress on the Growth and Related Physiological Indexes during Hevea Seedling Growth Period

The hydroponic experiment was taken for hevea seedling with 5 different stress level treatments P quality concentrations:31 mg·L-1(CK),10 mg·L-1,5 mg·L-1,1 mg·L-1 and 0 mg·L-1.The results indicated that hevea young seedling biomass,above-ground biomass,plant height,main root length and the number of leaf storey decreased,there was a big difference between low P treatments and normal phosphorus supplies.Under low phosphorus stress,root biomass of heavea seedlings maintained a relatively high level.Under low phosphorus concentration,the phosphorus concentration in heavea tree decreased,and the decreased range in root and stem were larger than the mature leaf and young leaf,moreover,the phosphorus concentration in root was highest.There were significant differences in root activity and NR active between low P treatments and CK,which were decreased under low phosphorus concentration.