NUTRIENT CYCLING IN THE DAHURIAN LARCH PLANTATION ECOSYSTEM

摘要

Based on the determinations of the nutrient elements including N, P, K, Ca, and Mg of Dahurian larch plantation ecosystem in the eastern part of northern China, the analysis of contents, distribution, accumulation of plant and soil nutrient elements,and the properties of the nutrient cycling through the larch plantation ecosystem were conducted. The results were as follows: the nutrient content of various ecosystem varied with plant organs, ages and distributive layer. The total amount of nutrient elements accumulated in the larch ecosystem was 27098 kg/hm~2, in which soil accumulation and plant accumulation were 268946 kg/hm~2 and 2040.602 kg/hm~2, respectively; the annual absorption of nutrient elements was 197.394 kg/hm~2, in which the annual retention and annual return of nutrient elements were 76.183 and 121.21 1 kg/hm~2, respectively. Compare to other forest communities, the cycling rates of various nutrient elements through larch plantation ecosystem was relatively higher.