不同林龄油茶林分生态系统生物量及其分配特征

Biomass and its distribution characteristics of Camellia oleifera stand ecosystem at different ages

Taking the plantation of Luchuan Camellia oleifera in Guigang, Guangxi as the research object, the biomass model was established to analyze the biomass in the three stands of young (3 years old), early (6 years old) and full (9 years old) and to clarify the law of its change with the age of the forest. The results showed that the total biomass of the 3-year-old, 6-year-old and 9-year-old Camellia oleifera forests was 11.20 t/hm2, 41.83 t/hm2 and 94.57 t/hm2, respectively, The total biomass increases with the increase of forest age, and its proportion is as follows: stand at full fruit stage>stand at initial yield stage>stand at young age. The root biomass of Camellia oleifera stands at different ages is mainly composed of root piles, accounting for 59.51%~76.76% of the total root biomass. The biomass of fine roots is the smallest, between 3.60% and 4.71%. The biomass of each part of the root system in different forest ages shows a trend of increasing with the increase of forest age. The proportion of root biomass is as follows: root pile>coarse root>medium root>fine root system. The biomass under the Camellia oleifera forest of different ages is 3.02t/hm2, 2.30t/hm2 and 3.46t/hm2 respectively. There is no significant difference in the proportion of the biomass content of the understory among the indicators, ranging from 19.65% to 44.51%.