Abstract:
To select a suitable regeneration method to rejuvenate the
Populus euphratica forest in the lower reaches of the Tarim River, the changes in photosynthesis parameters of
Populus euphratica at different seedling ages during the fast-growing period (June-July-August) under artificial digging and natural seeding regeneration methods were analyzed. The photosynthesis-light and CO
2 responses of
Populus euphratica seedlings at 2a, 3a, 5a and 7a during the fast-growing period were measured using a US Li-6400XT photosynthesis instrument. The results show that the photosynthetic potential of
Populus euphratica seedlings under artificial pit regeneration is better, especially the ability to use strong light, which reflects faster growth under strong light; The
Amax value of
Populus euphratica seedlings under artificial pit regeneration is generally higher, and the Rubisco activity, CO
2 assimilation capacity, utilization efficiency, and photorespiration rate of
Populus euphratica are higher in artificial seed regeneration too. It is concluded that artificial pit regeneration are more suitable, which will help the
Populus euphratica forest in the middle and lower reaches of the Tarim River and the demonstration and popularization of planting techniques in future.