云南菜阳河自然保护区热带季节雨林乔木生物量

Biomass of Tree Layer of Tropical Seasonal RainForest in Caiyanghe Nature Reserve, Yunnan

根据样地调查数据和已发表的季节雨林生物量模型,研究了滇南热带最北缘的思茅菜阳河自然保护区热带季节雨林乔木(DBH≥5cm)生物量及其分配特点。结果表明:乔木层总生物量为390617kghm-2,在各器官的分配向树干和树根集中:树干为273601kghm-2,占70.04%,树根为85128kghm-2,占21.79%,树枝和树叶分别占7.42%和0.74%;生物量径级分配以80-<100cm和120-<140cm等为主;生物量垂直分配向乔木上层集中:Ⅰ亚层(高度30-40m)占55.27%、Ⅱ亚层(15-<30m)占37.12%、Ⅲ亚层(<15m)占7.61%。生物量在热带季节雨林各种类中的分配集中于少数种类,八宝树和绒毛番龙眼分别占乔木层生物量的27.58%和21.14%。结果表明最北缘的热带季节雨林乔木生物量与西双版纳季节雨林的相近,干扰作用使得季节雨林先锋树种八宝树的生物量最高。

The biomass in tree layer of tropical seasonal rain forest was studied in Caiyanghe Nature Reserve, Simao, Yunnan Province. Tree biomass was estimated by measuring all trees with diameter at breast height (DBH)≥5 cm in 1 hm2 sampl e plot located at 1 130 m altitude. On the basis of the published biomass regres sion model for the seasonal rain forest, the biomass of component parts of tree was calculated. Total biomass of trees ≥5 cm DBH in the forest was 390 617 kg h m-2. Biomass allocation was 273 601 kg hm-2 for stems and 85 128 kg hm-2 for roo ts, accounting for 70.04% and 21.79% of the total, respectively. The biomass in branches and leaves amounted to 7.42% and 0.74%, respectively. Biomass allocatio n for trees with different DBH was concentrated in DBH classes of 80-<100 cm and 120-<140 cm. Vertical allocation of biomass was 55.27%, 37.12% and 7.61% for tr ee heights at 30-40 m, 15-30 m and <15 m, respectively. High biomass percentage appeared in two of the 22 species,Duabanga grandiflora and Pometia tomentosa, amounting to 27.58% and 21.14%, resp ectively.