辽宁冰砬山不同年龄落叶松人工林生物量和生产力的研究

森林生物量和生产力直接关系到森林生态系统的固碳能力.以冰砬山4个年龄阶段的长白落叶松(Larix olgensis)人工林为研究对象,采用标准木收获法建立生物量与胸径的相对生长方程,推算各林龄的生物量、生产力及其分配规律.结果表明:幼龄林、中龄林、近熟林和成熟林的群落生物量分别为154.04t· hm-2· a-1、179.29t· hm-2· a-1、229.40t·hm-2· a-1和254.78t· hm-2· a-1,其中乔木层生物量占群落生物量的比例达94％以上.不同年龄阶段的落叶松人工林乔木层的年平均净生产力均较高,并随着林龄的增大而下降,幼龄林乔木层的生产力可高达16.71t· hm-2· a-1,比成熟林的生产力高出近1倍.在所有不同年龄阶段,各器官的生产力占总生产力的比例平均为:叶(46％)＞树干(39％)＞根(10％)＞枝(5％).

Biomass and Net Primary Productivity of Larix olgensis Plantation in Bingla Mountains,Northeast China

There is a close relationship between forest biomass and fixed carbon of forest ecosystems.In this paper,a group of allometric growth equations were established to estimate the allocation patterns of biomass and net primary productivity at 4 different ages in Larix olgensis plantations located in Bingla Mountains(Northeast of China).The main results are as follows:(1) Total biomass of community at different vegetative stages were 154.0t·hm-2,179.3t·hm-2,229.4t·hm-2 and 254.8 t·hm-2 for juvenile,middle-aged,near-mature and mature stand respectively.And the proportions of arbor were more than 94%.The net primary productivity of arbor were decreased with stand age,it could up to 16.71t·hm-2·a-1 for juvenile which was higher than the productivity of mature forest near 1 times.The average proportions of different organs of the total productivity in all stand ages were in sequence of leaf(46%)> stem(39%)> root(10%)> branches(5%).