Abstract:
With the purpose of promoting the growth of
Malus transitoria in high-altitude tundra, the self-adjusting heat tape used to heat soil is employed to execute soil warming test. 4 warming gradients, namely, 2.0 ℃ (S
1), 3.0 ℃ (S
2), 4.0 ℃ (S
3), 5.0 ℃ (S
4) and 1 CK are presented in the test to measure
Pn,
Tr,
Gs as well as
Ci of
M.transitoria under different temperature gradients. The result is achieved that among the 4 group of experimental objects, the leaves of S
4 enjoy the highest
Pn,
Tr and
Ci with a respective growth rate at 13.88%, 58.55% and 18.42%, S
3 boasts the highest
Gs with a growth rate at 8.68%. Besides, the soil temperature is significantly correlated to
Pn,
Gs as well as
Ci of
M.transitoria leaves and is correlated to
Tr of the plant. Compared with CK, S
4 and S
3 can prominently improve
Pn and
Tr while S
4, S
3 and S
2 can obviously raise
Gs and
Ci. After a comprehensive analysis of all indicators, the result is achieved that a raise of 4.0-5.0 ℃ of soil temperature is mostly suitable for
M.transitoria to grow.