阔叶红松林的生物量和营养元素含量的研究

A STUDY ON BIOMASS AND NUTRIENT CONTENT OF HARDWOOOD-KERAN PINE FOREST

一、研究内容和方法我们于1985—1987年对小兴安岭阔叶红松林的生物量进行了研究。生物量的测定是在凉水自然保护区的阔叶红松林内进行的。林龄220年,组成8红2椴,林分平均高23.1m,平均直径37.4cm。其中红松平均高27.2m,平均直径45.2cm,密度622株/ha。

The biomass is determined and the mineral content is analyzed for the hardwood-Korean pine forest in the Lesser Xingan Mountains: The total biomass of the forest is 363.9 t/ha, which consists of three compart ments, korean pine 304.5 t/ha, broadleaved trees 47.4 t/ha, and understory vegetation 11.7 t/ha. Most of biomass accumulates in trunks, 191.0 t/ha, which is more than 1/2 of the total biomass. The root biomass is 89.3 t/ha, about one fourth of the total. Rests are accumulated: in leaves, branches and barks. The total amount of nine nutrient elements including Cu, Zn, Mn, Fe, K, Ca, Mg, P, and N, is 3174.1 t/ha, which is 0.87％ of the total biomass. The elements with high contents in the biomass are N (1056 kg/ha), Ca (999.3 kg/ha), and K (763.6 kg/ha). The elements with low contents are Cu (2.4 kg/ha) and Zn (7.0 kg/ha). The nutrient content in korean pine accounts for 63.7％ of the total nutrient amount, broadleaved trees 27.4％, and understory vegetation 8.9％.