论文部分内容阅读
采用径级标准木和维量分析方法研究了西双版纳热带次生林 4块不同年龄林分的净初级生产量 ,结果表明 :林分净初级生产量随林龄而增长 ,5年生林分为 115 4 .3g·m-2 ·a-1,其分配为 :净生长量占 93.82 % ,花果量占1.2 0 % ,叶被采食量 4 .97% ;10年生林分为 1348.5g·m-2 ·a-1,净生长量占 92 .83% ,花果量占 3.2 5 % ,叶被采食量3.92 % ;14年生林分为 2 2 12 .1g·m-2 ·a-1,净生长量占 91.72 % ,花果占 3.0 5 % ,叶被采食量 5 .2 3% ;2 2年生林分为2 6 6 0 .1g·m-2 ·a-1,净生长量占 92 .0 9% ,花果占 3.95 % ,叶被采食量 3.96 %。林分净初级生产量的器官分配以茎所占的比例最大 ,占 1/ 3以上 ;其次为根 ,占 1/ 5左右 ;枝和叶为 1/ 5～ 1/ 7;花果所占的比例除 5年生林分相当少外 ,其余 3个林分约占 1/ 33。林分净初级生产量的层次分配以乔木层所占的比例最大 ,占 2 / 3以上 ,其次为灌木层 ;草本层和层间植物所占的比例相当少。林分的叶面积指数随林龄而增大 ,并分别建立了各林分主要优势种及乔木层样木器官生长量的优化回归模型
The net primary production of four forest stands with different ages in tropical secondary forests of Xishuangbanna was studied by means of standard-scale timber and dimensional analysis. The results showed that the net primary production of stands increased with age and the 5-year-old forest was 115.4. 3g · m-2 · a-1, the distribution was as follows: the net growth accounted for 93.82%, the flower number accounted for 120%, the leaf feed intake was 4.97%; the 10-year-old forest was 1348.5g · m-2 · A-1, accounting for 92.83% of the net growth, accounting for 3.2 5% of the total flower population and 3.92% of the total leaf area intakes; the 14-year-old forest was divided into 2 12.1 g · m -2 · a -1, Growth accounted for 91.72%, flower accounted for 3.05%, leaf feed intake 5.23%; 2 2-year-old forest was 2660.1g · m-2 · a-1, net growth accounted for 92 .0 9%, 3.95% flower and fruit, leaf feed intake 3.96%. The net primary production of organs accounted for the largest proportion of stems, accounting for more than 1/3, followed by roots, accounting for about 1/5; branches and leaves 1/5 ~ 1/7; In addition to the proportion of five-year-old relatively small, the remaining three stands about 1/33. The distribution of net primary production in the stand accounted for the largest proportion of the tree layer, accounting for more than two-thirds, followed by the shrub layer; herbaceous layer and inter-layer plants accounted for a relatively small proportion. The leaf area index of stand increased with age, and the optimal regression model of main dominant species of each stand and the growth of tree-like wood organ was established respectively