天童常绿阔叶林次生演替过程中细根的生物量动态

应用土钻法对天童常绿阔叶林次生演替过程中细根的生物量进行了调查，结果显示：细根生物量随演替进程变化显著（P<0.05），在演替前期的灌丛阶段达最高(3.286 t·hm^-2)，在演替中期马尾松和马尾松+木荷群落降低(1.066 t·hm^-2和1.531 t·hm^-2)，到演替后期的木荷群落和栲树群落再次升高(2.715 t·hm^-2和3.181 t·hm^-2).各演替阶段活细根和死细根生物量的季节变化显著（P<0.01）.各群落的活细根生物量在7月达最高，而在11月最低；死细根生物量，各群落皆于11月最小，而在演替早期两群落和马尾松+木荷群落4月最大而其它群落7月最大.各演替阶段细根生物量随着土层深度增加而下降明显，细根生物量80％左右分布在20 cm以上土层.

Temporal and spatial patterns of fine root mass along a secondary succession of evergreen broad-leaved forest in Tiantong

This paper presented temporal and spatial patterns of fine root mass along a chronosequence of evergreen broad-leaved forest in Tiantong, Zhejiang Province of China. The level of fine root mass was highest in the forest of early successional (Lithocarpus glaber +Loropetalum chinense Comm., 3.286 t·hm-2), while lowest in that of middle successional stage(1.066 t·hm^-2 and 1.531 t·hm^-2).In the forest of late successional stage,the level of fine not mass was intermediate (2.715 t·hm^-2 and 3.181 t·hm^-2). The seasonal variation of fine root biomass(FRB) and fine root necromass(FRN) is significant (P<0.01), peaking in July and lowest in November. But in April, FRN of early successional stage forest reaches its maximum. The spatial distribution of FRB and FRN was mainly concenrated on the upper level labont 80% of the total. Fine root distribution in depth was not clearly affected by stand age.