恢复森林中的多样性和生产力

Diversity and productivity in restoration forest

分析了西北黄土高原六盘山国家自然保护区从次生草地到不同恢复时间森林群落的物种多样性和生产力.结果显示:随着恢复,群落内灌木和乔木的多样性、生产力均逐步增加(P<0.001),物种多样性和生产力之间的关系表现为正相关关系.随时间的推移,草本植物的多样性对生产力的相关关系效应增强,而灌木植物的则下降.优势种的特征亦影响多样性和生产力之间的关系(P<0.01).在以针叶树钟为优势种的群落内,多样性和生产力表现为正幂指数函数关系;而在以阔叶树种为优势种的群落内,两者之间不存在显著的相关关系.

The dynamic relationship was examined between species diversity, functional group identity and productivity among trees, shrubs and herbs along restoration time and restoration successional gradient in the Liupanshan National Natural Reserve, northwestern Loess Plateau, China. The results showed that along with vascular plant diversity, productivity increases significantly （P〈0.001）, and a positive curvilinear relationship is observed between tile two. Tile relationship between diversity and productivity is positively curvilinear in the coniferous forest（P〈0.01）, but such a relationship disappeared in the broad-leaved forest.