桉树人工林的水源涵养功能

以不同林分类型各层次的持水能力及林地土壤持水能力为依据,评价各林分水源涵养能力。结果表明:不同林分类型的水源涵养能力存在差异,其中地上部分持水能力以次生林最佳,为30.6t·hm-2;林分最大持水量和林分持水量以马尾松林最佳,分别为2166.5和2290.9t·hm-2,尾巨桉林均居中等水平,说明尾巨桉林与乡土树种林的持水能力都比较强。据此可以推测,随尾巨桉林龄的增加,其地上部分的持水能力会逐步增强。

Study on water conservation function of Eucalyptus plantation

Based on analysis of water-holding capacity of stand components and forest soil,the water conservation capacity of different stands type was evaluated.The result showed that there were obvious difference existed in the forests of different stands.The water holding capacity of aboveground part of secondary forest was the best with 30.6 t·hm-2.The Pinus massoniana forest had the highest water holding capacity and the max with 2 166.5 t·hm-2 and 2 290.9 t·hm-2 respectively.The capacity of Eucalypt usurophylla × E.grandis forest,like the native species,toped middle level indicated that they had strong water holding capacity.It could be expected that the water holding capacity of the aboveground part of E.usurophylla × E.grandis forest would increased as the age increased.