The photon flux density is usually expressed in μmol/m 2 ·s or μE/m 2 ·s. The conversion between them is 1μE=1μmol/m 2 ·s. Among them, 1 μmol/m2·s=6.022*1023*10-6 photons pass through an area of ​​1 square meter per second.
In the following, we will analyze the changes of transpiration rate and stomatal conductance of American ginseng under different photon flux densities.
Table 1 Diurnal changes of transpiration rate, stomatal conductance and influencing factors of leaves of ginseng
Growth potential
project
Observation time
8:00
10:00
12:00
14:00
16:00
18:00
Strong ginseng leaves
Photon flux density μmol/m2・s
689.90
1296.70
1510.00
286.70
126.30
62.70
Stomatal conductance mmol/m2・s
273.00
351.00
61.90
24.60
55.50
28.20
Transpiration rate mmol/m2・s
3.48
7.44
2.01
0.64
1.31
0.53
Leaf temperature difference °C
-0.20
0.20
1.30
-0.30
-0.30
-0.70
Leaf gas saturated vapor pressure difference hPa
13.11
21.40
28.38
24.56
24.87
22.11
Strained leaf
Photon flux density μmol/m2・s
710.00
1390.00
1525.00
233.00
109.70
61.50
Stomatal conductance mmol/m2・s
222.00
132.00
30.90
37.30
24.10
23.40
Transpiration rate mmol/m2・s
2.77
2.91
0.96
0.88
0.64
0.52
Leaf temperature difference °C
-0.40
0.00
1.20
-0.05
-0.05
-0.07
Leaf gas saturated vapor pressure difference hPa
12.70
15.96
31.81
26.76
26.38
22.56
Table 2 Diurnal changes in transpiration rate, stomatal conductance and influencing factors of leaves of Ginseng
Growth potential
project
Observation time
7:00
9:00
11:00
13:00
15:00
17:00
Strong ginseng leaves
Photon flux density μmol/m2・s
85.66
178.50
330.00
293.20
265.00
125.30
Stomatal conductance mmol/m2・s
156.00
155.00
154.00
216.00
108.60
85.40
Transpiration rate mmol/m2・s
1.20
1.30
1.35
1.86
1.54
1.11
Leaf temperature difference °C
-1.00
-0.07
-0.40
-0.70
-0.40
-0.60
Leaf gas saturated vapor pressure difference hPa
7.36
8.57
8.95
10.63
15.73
13.23
Strained leaf
Photon flux density μmol/m2・s
63.30
120.30
405.00
300.00
258.00
97.50
Stomatal conductance mmol/m2・s
132.50
115.00
55.60
108.00
57.60
52.00
Transpiration rate mmol/m2・s
0.39
0.74
0.52
1.54
0.87
0.65
Leaf temperature difference °C
-0.80
-0.60
-0.50
-0.50
-0.50
-0.60
Leaf gas saturated vapor pressure difference hPa
7.24
6.66
8.29
11.81
15.66
13.73
From Table 1, it can be seen that on sunny days, the stomatal conductance and transpiration rate of the leaves of the sturdy plants showed double peaks at different light flux densities of one day, and the corresponding conditions were at 10:00 am and 4:00 pm A peak occurs. In the morning, with the continuous increase of the photon flux density, the stomatal conductance and transpiration rate of the leaves of the participating plants also increased, reaching the maximum at 10:00. When approaching 12:00 noon, the differential pressure of water vapor saturation vapor of the American ginseng leaves is further expanded, and the leaf temperature difference is positive and maximum. At this time, the leaves will close the pores in order to protect themselves, so that the transpiration is significantly weakened and the evaporation of water is effectively reduced. In the afternoon, the photon flux density began to decline, leaf temperature began to decline, and the temperature slightly lags behind. The temperature difference between the leaves began to be negative, and the pores of the participating strains began to open. The second peak of stomatal conductance and transpiration rate followed by a slow decline.
However, the stomatal conductance and transpiration rate of the lean strains showed inconsistent states. The stomatal conductance decreases with the increase of the photon flux density, and it slightly rises in the afternoon, but it is not obvious, and then continues to decline. This is because the temperature difference between the leaves in the morning is almost 0, causing the stomata of the leaves to close, and the leaf temperature in the afternoon is higher than the temperature and the stomata is completely closed. The leaf transpiration rate rises with the increase of the photon flux density before 10:00 AM, and then the closing rate of leaf stomata decreases.
According to Table 2, low light intensity in cloudy weather leads to smaller stomatal conductance values, lower vapor pressure and transpiration rate inside and outside stomata, and reduced self-regulatory capacity of stomatal stomata, whether it is a strong or weak strain, Both stomatal conductance and transpiration rate peaked in the afternoon, and the appearance time was 2 hours behind the highest value of the photon flux density.
From the above two tables, it can also be seen indirectly that the strong resistance strains are stronger than the weak strains, and the strong strains can adjust their own stomatal conductance and transpiration rate by opening and closing the stomata to adjust their own water content. Enhance their ability to adapt to the outside world.
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