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2008年3月至2009年3月,对不同林龄(3a、5a、6a、7a)的三倍体毛白杨纸浆林地上凋落物动态变化进行分析研究。结果表明,不同林龄林分的凋落物量随林龄的增加而增加,全年凋落物总量为(216.03±59.73)～(482.38±101.34)g·m-2·a-1;凋落物的月动态变化表现为单峰曲线,最大凋落量出现在10月份;通过凋落物归还林地的N、P量及能量均随林龄的增加而增加,表现出与凋落物量相同的月动态规律。由凋落物归还的N为1.84～2.89g·m-2·a-1,归还的P为0.58～1.17g·m-2·a-1,归还到林地的能量为3.96×106～8.89×106J·m-2·a-1。
From March 2008 to March 2009, the dynamic changes of litterfall in the triploid P. solani pulpwood forests with different age (3a, 5a, 6a, 7a) were analyzed. The results showed that the litter amount of different age stands increased with the increasing of age, the total litter amount was (216.03 ± 59.73) ~ (482.38 ± 101.34) g · m-2 · a- Showed the single peak curve and the maximum litter amount appeared in October. The N, P and energy returned to litter by litter increased with the increasing of litter age, showing the same monthly dynamic pattern. The N returned by litter was 1.84-2.89g · m-2 · a-1, the returned P was 0.58-1.17g · m-2 · a-1 and the energy returned to the woodland was 3.96 × 106-8.89 × 106J · M-2 · a-1.