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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％．
Systematic studies on the law of dry matter production, accumulation and return of Paulownia polygamis in the mixed farming of Agrotus fortunei showed that the biomass of Paulownia indigotica increased with the increase of tree age, and the distribution proportion of biomass in various organs was as follows: trunk> branch> Leaves> flowers. The annual dry matter production of Paulownia insignis mainly concentrated in May-July, accounting for 77.3% of the total dry matter production in the whole year. The deciduous leaves of Paulownia tomentosa were mostly fallen leaves, accounting for 87% of the total litterfall. 1%. The litterfall was accompanied with the whole process of annual growth season, with two peaks each year. The dry matter accumulation of Paulownia elongata mainly occurred from May to July, accounting for 72.7% of the total dry matter accumulation in the whole year. The dry matter return rate of 33.73%.