不同林龄油茶林分生物量及其分配特征研究

Biomass and Allocation Characteristics of Camellia oleifera Stands of Different Ages

本文以贵港地区陆川油茶人工林为研究对象,建立其生物量模型,分析幼林期(林龄3年)、初产期(林龄6年)和盛产期(林龄9年)3种林分生物量,并探索生物量变化规律。结果表明:幼林期、初产期、盛产期油茶林分总生物量分别为11.20、41.83、95.56 t/hm^(2),总生物量随着林龄的增加而增加,其占比表现为盛产期>初产期>幼林期。不同林龄油茶林分根系的生物量均以根桩为主体,占全根系生物量的59.51%~76.76%。细根的生物量占比最小,为3.61%~4.65%。不同林龄油茶林分根系各部分生物量随着林龄的增加而逐渐增加,根系生物量的占比依次为根桩>粗根>中根>细根。幼林期、初产期、盛产期油茶林分林下生物量分别为3.02、2.30、3.46 t/hm^(2)。林下生物量各指标间占比差异不大,占比为19.65%~44.51%。

This paper took the artificial forest of Luchuan Camellia oleifera in Guigang area as the research object and established its biomass model,analyzed the biomass of three kinds of stands in young forest stage(forest age was 3 a),primary production stage(forest age was 6 a)and full production stage(forest age was 9 a),explored the variation regulation of biomass.The results showed that the total biomass of Camellia oleifera stands in the young forest stage,primary production stage and full production stage was 11.20,41.83,95.56 t/hm^(2),respectively.The total biomass increased with the increase of forest age,and its proportion was manifested as full production stage>primary production stage>young forest stage.The root biomass of different ages of Camellia oleifera stands was mainly composed of root piles,accounting for 59.51%-76.76%of total root biomass.The proportion of fine root biomass was the smallest,ac-counting for 3.61%-4.65%.The biomass of each part of the root system in Camellia oleifera stands of different forest ages gradually increased with the increase of forest age,and the proportion of root biomass was in the order of root pile>coarse root>medium root>fine root.The understory biomass of Camellia oleifera stands in the young forest stage,primary production stage and full production stage was 3.02,2.30,3.46 t/hm^(2),respectively.The proportion difference among various indicators of understory biomass was not significant,accounting for 19.65%-44.51%.