低磷与邻株竞争协同胁迫对杉木幼苗生长的影响

Objected with the widely planted in South China recently, using the sand-culture indoor simulation pots supplying with three different P levels, and planting single seedling and double ones separately, a couple stress environment with low P and tree competition was constructed. Main results were as follows. The couple stress could obviously promote the height growth of seedlings of Chinese fir, but P deficiency inhibited the growth. Effects of supplying P levels and planting patterns on ground diameter growth of Chinese fir were not significant, but the synergistic effect on the ground diameter growth had a certain influence. There was significant effect for planting patterns on the growth of seedling roots. Increments of all the roots morphological indexes, including length, surface area, diameter and volume, were large under the low P and competition couple stress.