黑石顶自然保护区南亚热带常绿阔叶林生物量与生产量研究——生物量增量及第一性生产量

STUDIES ON BIOMASS AND PRODUCTION OF THE LOEWR SUBTROPICAL EVERGREEN BROAD-LEAVED FOREST IN HEISHIDING NATURAL RESERVE——310MASS INCREMENT AND NET PRIMARY PRODUCTION

本文研究了黑石顶自然保护区南亚热带常绿阔叶林的生物量增量及其分配规律,净第一性生产量及其分配规律.生物量增量为10.680t·hm^(-2)·a^(-1),其中干6.127(57.37％),枝2.195(20.55％),叶0.514(4.81％),根1.844(17.27％)。乔木层8.786(82.27％),灌木层1.679(15.72％),草本层0.215(2.01％).生物量增量的垂直分布以20—25m的林冠层比例最高,其次是10—15m的乔木层第二亚层.生物量增量的径级分布近于正态分布。 净第一性生产量为29.612t·hm^(-2)·a^(-1),其中干8.181(27.63％),枝3.403(11.49％),叶4.281(14.46％),根13.165(44.46％),花果0.582(1.97％)。细根(D≤3mm)生产量占根系生产量的81％,根系生产量约占净第一性生产量的45％。传统假定的根系生产量占森林生产量的15％—25％可能是太低的估计.森林的生产效率为1.897t·t_叶^(-1)或1.733t·hm_叶^(-2)各器官的生产效率有如下顺序:细根>叶>根(包括细根)>枝>干。EVI法用于该森林树干生物量增量的估计,得到较低的值(约低27％).

Biomass increment, net primary production, and their allocation of the lower subtropical evergreen broad-leaved forest in Heishiding natural reserve were studied. Biomass increment of the forest amounted to 10.680t.hm-2a-1, among which trunk 6.127(57.37%), branch 2. 95(20.55%), leaf 0.514(4.18%), and root 1.844(17.27%).Increments in tree layer, shrub layer,and herbaceous layer were 8.786t.hm-2.a-1(82.27%) ,1.679(15.72%),and 0.215(2.01%) respectively.Vertical allocation of biomass increment was dominated by the canopy (20-25m), next by the second sub-layer(10-15m) of the tree layer. Distribution of the increment among different diameter classes neared a normal pattern.Net primary production of the forcst(Pn) was 29.612t.hm-2.a-1, and that of trunk,branch,leaf,root,and fruit and flower,8.181(27.63%), 3.403(11.49%), 4.281(14.46%),13.165(44.46%), and 0.582(1.97%) respectively.Fine root (D≤3mm)production was very important,about 81% of total root production, and root production was about 45% of Pn. Traditionally accepted root production values 15%-25% of Pn was probably too low.Production efficiency of the forest was 1.897t.t-1(leaf) or 1.733t.hm-2 (leaf).Efficiencies of different organs showed a sequence as follows: Fine root> leaf>root (including fine root) >branch>trunk. EVI method presented a lower estimate of trunk biomass increment by about 27%.