云杉、冷杉林的光合作用特征及其采伐更新

在西南横断山区云杉、冷杉林内对其光合速率进行测定,并对其天然更新情况进行调查,结果表明,云杉、冷杉的光合速率受光照强度、温度、风速和日照时数的影响较大,湿度及土壤温度的影响较小。采伐迹地上天然更新幼树(苗)的生长,优于林内天然更新的幼树(苗)。林下天然更新,以郁闭度较小而透光率较大的林分为优、

CHARACTERISTICS OF PHOTOSYNTHESIS AND CUTOVER RESTOCKING OF SPRUCE AND FIR

Determination has been made of the photosynthesis rate in the spruce and fir forests in the subalpine region of the Hengduan Shan Mountains, and the survey of their natural regeneration has been conducted. The photosynthesis rate Of the spruce and fir is more strongly affected by the sunlight intensity, temperature, wind speed and sunshine duration, but less strongly by the humidity and soil temperature. In terms of natural regeneration, the seedling and sapling establish better on cutover land than in forest. In the stands where the canopy density is lower and the light transmission percent is higher, the natural regeneration is better.