华南南亚热带不同演替阶段植被类型的初级生产力和养分

Primary Productivity and Nutrients in the Plant Communities of Succession in Southern Subtropical Zone of South China.

1 引言季风常绿阔叶林(或称亚热带常绿季雨林)是华南南亚热带的原生植被和顶极植物群落[1,2]。然而,由于人为的干扰,这一地区已很少存在原生植被。目前,曾经生长季风常绿阔叶林的相当大部分地区已被次生草地和灌木林植被所覆盖[1～3]。但是在自然条件下,一旦停止人为干扰,该区的植物群落倾向于恢复原来的森林植被,其演替序列为草地→灌木林→季风常绿阔叶林[1,3]。因为缺乏研究,人们对华南南亚热带人类活动和自然过程对植被生产力的影响知道得很少。但是,理解在植被演替中生态系统生产力的变化对生态系统的管理和利用极为重要。草地。

Grassland,shrubland and forest are plant communities in different phase of succession in southern subtropical zone of South China. Their phytomass, net primary productivity,and nutrients were studied. The results showed that the development of phytomass through positive succession provided a machanism for nutrient uptake and established compartments for nutrient storage in the phytomass. Primary production and its nutrients were also increased through positive succession from grassland to forest. In addition,forest sustained more nutrient supply from litter than the grassland and shrubland and had relatively greater phytomass accumulation ratio and ability to conserve nutrients.