天童常绿阔叶林次生演替过程中细根的生物量动态  

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

作　　者：曾凡荣[1] 施家月[2] 阎恩荣[1] 张仁良 王希华[1] 

机构地区：[1]华东师范大学环境科学系,上海200062 [2]华东勘测设计研究院,杭州310014 [3]宁波市公路管理局,浙江宁波315040

出　　处：《华东师范大学学报（自然科学版）》2008年第6期56-62,共7页Journal of East China Normal University(Natural Science)

基　　金：国家自然科学基金(30130060)

摘　　要：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(3.286t.hm-2),在演替中期马尾松和马尾松+木荷群落降低(1.066t.hm-2和1.531t.hm-2),到演替后期的木荷群落和栲树群落再次升高(2.715t.hm-2和3.181t.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20cm以上土层.This investigation was carried out in Tiantong, Zhejiang Province of China. The resuits showed that the level of fine root mass was the highest in the forest of early successional stage （Lithocarpusglaber ＋ Loropetalurn chinense Comm. , 3. 286 t· hm^- 2）, and the 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 root 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 concentrated on the upper level （about 80%0 of the total）. Fine root distribution in depth was not clearly affected by stand age.

关 键 词：细根 生物量 常绿阔叶林 次生演替 天童 

分 类 号：S718.54[农业科学—林学]