间伐后杉木人工林生态系统养分动态的研究

将定位试验地杉木人工林间伐后，对其生态系统不同层次养分积累动态特性进行了研究．结果表明：间伐后林木各器官营养元素含量发生了变化；乔木层由于生物量的减少，养分积累量也相应减少，而灌、草及死地被物层养分积累分别增加２７２．１％，３７．２％和１６０．０％；整个杉木人工林生态系统养分的积累无论是大量元素，还是微量元素均超过对照；林下植被和死地被物层在系统养分循环中具有重要作用．

Nutrient Study of a Thinned Chinese Fir Plantation Ecosystem

The accumulation of nutrient elements in different strata of a thinned Chinese fir plantation ecosystem are analyzed in this paper. The results show that element contents in different organs of the thinned stand differ from those of the control stand. In the arbor stratum, the accumulation of nutrient elements decreased because of the decrease of its biomass, while that in the shrub, herb, and dead litter stratum increased by 272.10%,37.20% and 160.00% respectivity . Both of macro and microelements accumulation in the thinned Chinese fir plantation ecosystem are bigger than those in the control ecosystem. The understory vegetation and dead litter play a great role in the nutrient cycling of the ecosystem.