摘要
本文对地处中亚热带安徽黟县的次生灌丛和灌草丛以及常绿阔叶幼林的地上部分生产力进行了测定。结果表明:黟县常绿阔叶幼林、次生灌丛和灌草丛的地上部分净生产力分别为11.94,6.84和3.80(t/ha·a),次生灌丛和灌草丛的生产力较低,对亚热带优越的水热资源利用不充分。所调查的九个样地的地上部分生物量和净生产力可回归成线性方程y=4.27+0.15x,净生产力随着生物量的增加而增加,即群落所处的演替阶段越高,净生产力越大,所以利用处于较高演替阶段的植被,会得到更多的收获。
This paper deals with the primary productivity of subtropical secondary shrub thickets and shrub-grasslands in Yixian County of Anhui Province. By using direct harvesting method, the abovegrcund productivities of six samples of shrub thickets, two samples of shrub-grasslands and one sample of evergreen broad-leaved young forest in the county were measured.The study results show. the productivities of the evergreen broadleaved young forest, the secondary shrub thickets and the shrub-grasslands were 11.94, 6.84 and 3.80 t/ha·a^(-1) respectively. By comparing with other community types, the productivity of the secondary shrub thickets and shrub-grasslands are lower, and they are less efficient in using the abundant natural resources of heat and water in the subtropical zone.The following regression equation was derived from the correlation of the biomass and net productivity of the nine samples: Y=4.27+0.15x, and it shows that net productivity increases with biomass.
关键词
亚热带
次生灌丛和灌草丛
净生产力
Subtropical zone
Secondary shrub thicket
Shrub-grassland
Net productivity
