Abstract: Taking the intensively managed pure bamboo (Phyllostachys pubescens) stand (Ⅰ), bamboo stand mixed with broadleaved trees (Ⅱ), and bamboo stand mixed with coniferous trees (Ⅲ) in Yong’an County of Fujian Province as test objects, this paper studied the distribution patterns of N, P, K, Ca, and Mg and the characteristics of biological cycle in the stands. The nutrient accumulation in the stands was in the order of Ⅱ > Ⅰ> Ⅲ, being 146196.59, 144466.35, and 105002.59 kg·hm^-2, respectively, and that in different layers of the stands was in the order of soil layer > tree layer > litter layer > shrub layer > herb layer, with the proportion in soil layer (0-60 cm) accounted for more than 99% of the total. The nutrient accumulation in vegetation layers was in the order of Ⅰ> Ⅱ> Ⅲ, and that in soil layer and litter layer was in the order of Ⅱ > Ⅰ> Ⅲ. Stand Ⅱ had the highest nutrient accumulation in its soil layer and litter layer, and thus, the greatest productive potentiality. The nutrient utilization coefficient of standsⅠ and Ⅱ were significantly higher than that of stand Ⅲ. The higher productivity depended on more nutrients. The nutrient cycling coefficient was in the order of Ⅲ> Ⅱ>Ⅰ. Stands Ⅲ and Ⅱneeded lesser nutrients than stand Ⅰ. The nutrient turnover time was in the order of Ⅰ> Ⅱ> Ⅲ, being 31.89, 12.39, and 12.23 years, respectively, and there was a significant difference between stands Ⅰ, Ⅱand Ⅲ. The bamboo stand mixed with broadleaved trees had higher productivity and stronger nutrient return ability, being a better management pattern of P. pubescens.

Key words: Seed bank, Arid desert, Life form, Species diversity, Similarity