锥栗人工林生物量和生产力的研究Ⅱ.生产力特征的研究

Studies of Biomass and Productivity Pattern of Castanea henryi Plantation Ⅱ.Study of Productivity Pattern

研究了锥栗 Castanea henryi人工林在未结果期、结果初期和盛果初期 3个不同的发育阶段的生产力特征 .结果表明 :随着林分生长年龄的增大 ,生产力上升 ,未结果期 ,结果初期 ,盛果初期年净生产量分别为 1.10 9t/hm2· a,3 .82 3 t/hm2· a和 8.93 0 t/hm2 · a;经济产量的增加与生物量增加趋势一致 ;叶面积指数至盛果初期可增至 1.963 2 ;未结果期 R值 (相对生长率 )较大 ,盛果初期较小 ;N AR值 (净同化率 )在结果初期最大 ,然后又下降 ,表明其随着树冠生长而变化 .

Castanea henryi plantation has differences in various growth stages. Accompanying the growth of age, economic and biomass yields have unanimous increasing tendency. The productivity reaches to 1.109 t/(hm 2·a), 3.823 t/(hm 2·a) and 8.9301 t/ (hm 2·a) respectively for three growing stages. LAI(leaf area index) gets to 1.9632 in initial full bearing stage, R value(relative growth rate) is higher in non bearing stage than in initial full bearing stage. NAR value(net assimilation rate) is the highest in initial bearing stage; and then it decreases which means it varies with the growth of tree crown.