Abstract:

The concentration,storage and allocation of nutrient element in Picea balfouriana plantation in west Sichuan forest region were investigated using field investigation, sample tree and plot harvest.The results show that,the total nutrient element storage of plant subventride in system were 1229.502kg·hm^-2,the storage in the tree layer was the largest,and constituted 77.22%.the sequence in which storage element varied among different layer was as follows:litter layer (205.872kg·hm^-2,16.73%),shrub layer (42.856kg·hm^-2,3.4%),herb layer (15.951kg·hm^-2,1.30%),bryophyte layer (15.361kg·hm^-2,1.25%),respectively.The total nutrient element storage in plantation ecosystem including N\,P\,K\,Ca and Mg,amout to 211696.097kg·hm^-2,in which storage in soil subventricle amount to 210493.2kg·hm^-2,and constituted 99.432%,the other in plant subventricle amount to 1202.892kg·hm^-2,and consitituted 0.568%.After analysing the nutrient situation in soil of the slash,the plantation and the virgin forest,it is put forward that the element storage in soil could meet the needs of normal growth of the plantation, and that the high density of the plantation was one of the main factors causing the decline of the tree growth after the stands 26-year-old.

Key words: Subalpine, Picea balfouriana, Plantation, Nutrient element, Concentration, Accumulation, Allocation