Abstract
This paper deals with light-photosynthesis curve, temperature-photosynthesis curve, diurnal changes of photosynthesis, and effects of water content and nitrogen in soil on pho- tosynthetic characteristics of leaves of Leymus chinensis. The results obtained are as fol- lows: 1. Light-photosynthesis curve of Leymus chinensis approximates to a hyperbola below light saturation point, and the influence of light intensity on photosynthesis is expressed by light intensity coefficient of photosynthesis. When Leymus chinensis was grown in a good water condition, its light intensity coefficient was 1.33 mg CO_2·dm~(-2)·h~(-1)·KLux~(-1) at 5KLux light intensity, and light saturation point was 50KLux, and net photosynthetic rate at light saturation condition was about 31 mgCO_2·dm~(-2)·h~(-1). Temperature-photo- synthesis curve of Leymus chinensis was a parabola, and optimum temperature of photo- synthesis was 26--29℃. CO_2 compensation point of Leymus chinensis was about 35 ppm. According to aforesaid characteristics of photosynthetic ecology, Leymus chinensis is a sun plant of C_3 type. 2. The curve of diurnal changes of photosyn thesis in Leymus chinensis shows as a two-peak type in typical steppe, when water content of soil is about 14%. Ma- jor ecological factor which caused midday depressing photosynthesis in Leymus chinensis ig atmospheric humidity. 3. The photosynthetic characteristics of Leymus chinensis, espe- cially the leaf area and aerial biomass are closely related with water and nitrogen in soil. Irrigation has greater influence on photosynthetic production as compared with fertiliza- tion. The efficiency of increasing production is more notable, combining the measures of irr- igation with fertilization. Leymus chinensis may be regarded as a eurytopic xerophyte accor- ding to the relationship between some photosynthetic characteristics and soil water. 4. Compared photosynthetic rate with leaf area in Leymus chinensis, the influence of the leaf area change on photosynthetic production is greater and is more remarkable during arid conditions. Therefore, irrigation and fertilization during dry season are effective measures to develop photosynthetic organ and to raise aerial biomass of Leymus chinensis rapidly.
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Claims 16
Claim · model-written summary
The light-photosynthesis curve approximated a hyperbola below saturation.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- Light-photosynthesis curvee0
Verbatim
e0“Light-photosynthesis curve of Leymus chinensis approximates to a hyperbola below light saturation point”
Claim · model-written summary
The light intensity coefficient was 1.33 mg CO2 per area-time-light at 5KLux with good water.
- Taxon
- Leymus chinensisLeymus chinensise1
- Outcome
- light intensity coefficiente0
- Value
- 1.33 mg CO_2·dm~(-2)·h~(-1)·KLux~(-1)e0
- Qualifier
- at 5KLux light intensitye0
Verbatim
e0“its light intensity coefficient was 1.33 mg CO_2·dm~(-2)·h~(-1)·KLux~(-1) at 5KLux light intensity”
e1“When Leymus chinensis was grown in a good water condition”
Claim · model-written summary
Light saturation occurred at 50KLux.
- Taxon
- Leymus chinensisLeymus chinensise1
- Outcome
- light saturation pointe0
- Value
- 50KLuxe0
Verbatim
e0“light saturation point was 50KLux”
e1“When Leymus chinensis was grown in a good water condition”
Claim · model-written summary
Net photosynthetic rate at light saturation was about 31 mgCO2 per area and hour.
- Taxon
- Leymus chinensisLeymus chinensise1
- Outcome
- net photosynthetic ratee0
- Value
- 31 mgCO_2·dm~(-2)·h~(-1)e0
Verbatim
e0“net photosynthetic rate at light saturation condition was about 31 mgCO_2·dm~(-2)·h~(-1)”
e1“When Leymus chinensis was grown in a good water condition”
Claim · model-written summary
The temperature-photosynthesis curve was parabolic.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- Temperature-photo- synthesis curvee0
Verbatim
e0“Temperature-photo- synthesis curve of Leymus chinensis was a parabola”
Claim · model-written summary
Optimal photosynthesis temperature was 26--29℃.
- Taxon
- Leymus chinensisLeymus chinensise1
- Outcome
- optimum temperature of photo- synthesise0
- Value
- 26--29℃e0
Verbatim
e0“optimum temperature of photo- synthesis was 26--29℃”
e1“Temperature-photo- synthesis curve of Leymus chinensis”
Claim · model-written summary
The CO2 compensation point was about 35 ppm.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- CO_2 compensation pointe0
- Value
- 35 ppme0
Verbatim
e0“CO_2 compensation point of Leymus chinensis was about 35 ppm”
Claim · model-written summary
Leymus chinensis was characterized as a C3 sun plant.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- sun plant of C_3 typee0
Verbatim
e0“Leymus chinensis is a sun plant of C_3 type”
Claim · model-written summary
Diurnal photosynthesis had two peaks in steppe at about 14% soil water.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- two-peak typee0
- Qualifier
- water content of soil is about 14%e0
- Setting
- typical steppee0
Verbatim
e0“diurnal changes of photosyn thesis in Leymus chinensis shows as a two-peak type in typical steppe, when water content of soil is about 14%”
Claim · model-written summary
Atmospheric humidity was identified as the major cause of midday photosynthetic depression.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- midday depressing photosynthesise0
- Qualifier
- atmospheric humiditye0
Verbatim
e0“Ma- jor ecological factor which caused midday depressing photosynthesis in Leymus chinensis ig atmospheric humidity.”
Claim · model-written summary
Leaf area and aerial biomass were closely related to soil water and nitrogen.
- Taxon
- LEYMUS CHINENSISLeymus chinensist0
- Treatment
- water and nitrogen in soile0
- Outcome
- leaf area and aerial biomasse0
Not reportedDirection
Verbatim
e0“the leaf area and aerial biomass are closely related with water and nitrogen in soil”
t0“LEYMUS CHINENSIS”
Claim · model-written summary
Irrigation influenced photosynthetic production more than fertilization.
Verbatim
e0“Irrigation has greater influence on photosynthetic production as compared with fertiliza- tion.”
t0“LEYMUS CHINENSIS”
Claim · model-written summary
Combining irrigation with fertilization increased production more notably.
- Taxon
- LEYMUS CHINENSISLeymus chinensist0
- Treatment
- irr- igation with fertilizatione0
- Outcome
- productione0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“The efficiency of increasing production is more notable, combining the measures of irr- igation with fertilization.”
t0“LEYMUS CHINENSIS”
Claim · model-written summary
The authors regarded Leymus chinensis as a eurytopic xerophyte.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- eurytopic xerophytee0
Verbatim
e0“Leymus chinensis may be regarded as a eurytopic xerophyte”
Claim · model-written summary
Leaf-area change influenced photosynthetic production more under arid conditions.
Verbatim
e0“the influence of the leaf area change on photosynthetic production is greater and is more remarkable during arid conditions”
t0“LEYMUS CHINENSIS”
Claim · model-written summary
The authors recommend irrigation and fertilization in the dry season to develop photosynthetic organs and raise biomass.
- Taxon
- Leymus chinensisLeymus chinensise0
- Outcome
- irrigation and fertilization during dry seasone0
Verbatim
e0“irrigation and fertilization during dry season are effective measures to develop photosynthetic organ and to raise aerial biomass of Leymus chinensis rapidly.”
The same questions in other papers
fertilization · yield · Leymus chinensisResults agree
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