甘肃省洮河林区云、冷杉林分结构及生长规律的调查研究

本文通过对洮河林区四个林场,设置标准地349块,调查样木1172株,经过计算分析,揭示了云、冷杉林分的结构特点和生长规律,为合理经营提供了大量可靠数据。洮河林区云、冷杉林为复层异龄林,株数按经级分布为倒 J 型曲线,树干圆满度好,数量成熟龄在120年,林分平均生长率为2.7%,林分平均年龄在80—100年之间,平均直径20厘米,属于中龄林,并编制了生长过程表及生长量、生长率表,可供生产设计时应用。

The Investigation on the Structure and Growth Laws of Picea and Abies Forests in Taohe Area in Gansu prevince

For the purpese of study,349 pieces of standard land have been set up,1172 plants investigated.Asresult of calculation and analyses the structural characteristics and growth laws of Picea and Abies forests have been brought to light.And thus a lot of reliable data have been provided for rational management of forests. The Picea and Abies forests in the Taohe forest floor belong to the category of duplicute layer one of different age.The distrubution of plant numbers according to its diameter can be showhed as a upside-down-J-shaped curve. The trunks of trees are rather round.The trees reach their maturity at the age of 120.The growth rate in the forest area is 2.7%,and the trees have grown here for 80—100 years.The average diameter of the trunks is 20cm. The forest is a middle-aged one.in the article there is also a table of growing prosess and increment,and a table of growth rate,which can be used for reference in preductive designing.