兰考泡桐生物量积累规律的定量研究

对农桐复合经营兰考泡桐的干物质生产、积累和归还规律的系统研究表明，兰考泡桐生物量随树龄增大而增加，生物量在各器官的分配比例依次为：树干＞树枝＞树根＞树叶＞花；兰考泡桐年干物质生产主要集中在５～７月，占全年干物质生产总量的７７．３％；兰考泡桐凋落物绝大部分为落叶，占凋落物总量的８７．１％，凋落伴随年生长季节的全过程，且每年出现两次高峰；兰考泡桐干物质积累主要发生在５～７月，占全年干物质积累总量的７２．７％；兰考泡桐全生育期的干物质归还率为３３．７３％．

Quantitative study on biomass accumulation of Paulownia elongata

The study on dry matter production, accumulation and return of Paulownia elongata in crop Paulownia intercropping system shows that the biomass of P.elongata increased with tree age, and its distribution in each organ followed the sequence: stem>branch>root>foliage>flower. The yearly dry matter production mainly occured from May to July, accounting for 77.3% of the whole yearly production. Defoliation accounted for 87.1% of the total litterfall. Litter fell throughout the whole yearly growth period, and showed two peaks annually. The yearly dry matter accumulation mainly occurred from May to July, accounting for 72.7% of the whole yearly accumulation, and the dry matter return ratio during its whole life period reached 33.73%.