摘要
本文研究了云南省易门县海拔1600—1700m的云南松中幼龄林分的净第一性生产量。3个林分的净生产量总量依次为:11年生林分是1201.0g/(m^2·a),23年生林分是1060.3g/(m^2·a),4年生林分是530.4g/(m^2·a)。各林分乔木层器官净生产量的分配比例均以针叶为最高,其次是干材。针叶净生产量的比例随林龄的增加而下降,干材、树枝和根的比例则随林龄的增加而上升。
The net primary production of middle-young stands of Pinus Pyunnanensis is not increases with increasing stand age as their biomass. The total amount of the net primary ( production in the 4-year-old stand is 530.4g/(m2·a), the 11-year-old stand 1201.0g/(m2·a), the 23-year-old stand 1060.3 g/(m2 ·a).
The percentages of the net production of tree layers in various layers of three stands arc the greatest, herb layer second, shrub layer the smallest.
The percentage of the net production of tree layer in the 11-year-old stand is the greatest, 23-year-old stand second, 4 -year-old stand the smallest; The percentages of the net production of shrub and herb layers in the 4 -year-old stand are the greatest, 23-year-old stand second, 11-year-ald stand the smallest.
The net production of needle is the greatest in all organs of tree layers in three stands, stem wood second. The percentage of the net production of needle decreases rapidly with increasing stand age, stem wood, branch and root increases constantly with.
出处
《云南植物研究》
CSCD
1991年第2期161-166,共6页
Acta Botanica Yunnanica
