缺苞箭竹密度对其生物量分配格局的影响

研究了一个生长季节内缺苞箭竹(Fargesia denudata) 紫果云杉(Picea purpurea)原始林下不同密度缺苞箭竹群落的生物量及其分配格局.结果表明,缺苞箭竹群落生物量、净生产量、平均单株生物量、地上部分生物量、地下部分生物量随密度的增加而增大,而缺苞箭竹地上部分净增长率却随密度的增加而降低.在一个生长季节内，缺苞箭竹地上部分与地下部分生长相关性随密度的增加而增大.除指数生长期(7、8月)外，缺苞箭竹地上部分/地下部分生物量比在生长季节内随密度增加而增大，但在缺苞箭竹生长的指数生长期，中等密度有较大的地上部分/地下部分生物量比.缺苞箭竹生物量在各器官的分配取决于密度和生长时期，密度对缺苞箭竹的生物量分配格局有显著影响.

Effects of Fargesia denudata density on its biomass distribution pattern

In this paper, the effects of Fargesia denudata density on its biomass distribution pattern were studied in the primitive Fargesia denudata-Picea purpurea forest from May to October, 2003. The results showed that with increasing stem density, the total biomass, above-and below-ground biomass, net production, and average stem biomass of the bamboo were all increased, while the net increment of aboveground biomass decreased. The relationship between above-and below-ground biomass in the bamboo communities was also regulated by the stem density, with the correlation coefficient increased with the density. Except for the exponential period (July and August), the ratio of above-/below-ground biomass increased with the density, and the moderate density (140 +/-7 stems x m(-2)) had the highest ratios of above-/below-ground biomass. The biomass distribution pattern of different organs depended on both stem density and growth period, and stem density played a significantly important role in the distribution pattern of bamboo biomass.