落叶松光合特性与初级生产力

STUDY ON THE PHOTOSYNTHETIC CHARACTERISTICS AND THE PRIMARY PRODUCTIVITY OF LARIX OLGENSIS

研究了不同立地条件下落叶松树冠各个方向的净光合速率、呼吸速率、日进程及季节进程。利用落叶松净光合速率计算出固定能量和葡萄糖量，作为初级生产力（Ｐｎ）的指标，来评价不同地区落叶松生长的能力。结果表明：哈尔滨林场的长白落叶松纯林和老山生态站的针阀混交落叶松林的初级生产力最大为８．５９７ＭＪ／ｍ－２·ｈ－１，其次二龙山林场的针叶混交林的落叶松为７．６３２ＭＪ／ｍ－２·ｈ－１，再次长白落叶松（大树）为８．４１０ＭＪ／ｍ－２·ｈ－１，最次的是老山生态站的兴安落叶松和长白落叶松纯林各为，６．１７７、６．０２３ＭＪ／ｍ－２·ｈ－１。

Diurnal and seasonal processes of net photosynthetic rate and respiration rate of directions of crown of Larch at different site conditions were studied. The capacity of growrh of Larch growing at different district was evaluated with the quantity of fixed energy and glucose calculated from net photosynthetic rate,the indicator of primary productivity(Pn).The results showed that:the primary productivity of pure Larix olgensis Henry at Harbin Forest Farm and that of mixed confer broad-leaf stand at Laoshan Eclogical plantation were the greatest,8.597MJ·m-2·h-1; secondary that of mixed conifer stand at Erlongshan Forest Farm was 7.632 MJ·m-2·h-1 and that of Larix olgensis Henry was 8.410 MJ·m-2·h-1; then those of pure Larix olgensis Henry and pure Larix gmelini at Laoshan Ecological Plantation were 6.023and 6.177 MJ·m-2·h-1 respectively.