方竹林垦复前后生物量结构变化的研究

方竹林垦复前总生物量1 496.34 g.m-2,垦复后2 959.59 g.m-2,垦复后笋产量是垦复前的2.31倍。垦复后1龄、3龄竹各构件的生物量均有提高,2龄竹的生物量变化不大,说明竹林年龄结构调整尚未完成。垦复后0-20 cm土层的生物量是垦复前的3.54倍,说明垦复措施主要改善了0-20 cm层的鞭根系统结构。垦复后地上部总含水率略有下降,地下部总含水率比垦复前略有提高。天然方竹林的垦复改造对竹林的生物量结构和产量有明显的影响。

Biomass structure changes of Chimonobambusa quadrangularis before and after reclaimed

Total biomass of Chimonobambusa quadrangularis was 1 496.34 g·m-2 before reclaimed and markedly increased to 2 959.59 g·m-2 after reclaimed which bamboo shoot production was 2.31 times than that before reclaimed.After reclaimed,the overground biomass of 1a and 3 a bamboo increased,but 2 a changed little,which indicated that the regulation of age structure had not been completed.The underground biomass of 0～20 cm soil layer after reclaimed was 3.54 times than that before reclaimed,which showed that the reclamation improved the bamboo rhizome and root system in this soil layer to a better situation.The total overground moisture decreased a little after reclaimed,while the underground moisture increased.Reclamation of wild Chimonobambusa quadrangularis forest had significant impact on biomass structure and yield of the bamboo forest.