纸浆材人工林复合轮伐期的讨论

Discussion on the Combined Rotation of Pulpwood Plantation

针对我国纸浆材人工林的经营现状和存在的问题，本文提出了复合轮伐期的概念。纸浆材人工林实行复合轮伐期经营的材积收获量，将比单一轮伐期经营高出２０％，再加上复合轮伐期生产的大径锯材市场价格高的因素，相应的经济收益将高出更多。复合轮伐期充分利用了地力和林木生长的潜力，它不仅是纸浆材轮伐期和大径锯材轮伐期的复合，也是经营目的的复合，体现了现代林业多目标培育林木的经营原则。

A new concept, combined rotation, was presented in the paper according to the circumstances and existing problems of pulpwood plantation management in China. The combined rotation was defined as the combination of two pulpwood rotation was larger sawtimber rotation in the management of pulpwood plantations. When plantation of a certain species reach the standard rotation age for pulpwood, the superior trees which take small proportion (about 1/10) will be kept in the plantation stand, while the rest of trees will be cut for pulpwood. Then the cut area is restocked with the same species and in the same spacing as before. This forest will be cut including the remained trees when its growth reach the standard age again. The remained trees will be cut for the use of larger sawtimber and the regenerated trees will be cut for pulpwood. Comparing with single pulpwood rotation, the management of the combined rotation can yield more wood and economic benefits because of the full use of site productivity and the potential of tree growth. The combined rotation is not only the combination of two rotations but also the combination of management objectives.