Environmental temperature plays an important role in the process of plant growth and survival. It is an important ecological factor that directly affects the photosynthesis and transpiration of plants. In addition, there is a sensitive response to changes in the temperature of the soil. Plants have very different growth conditions at both temperatures. There are many researches on the temperature and the growth of plants and leaves. However, there are few studies on the relationship between the temperature and humidity of the soil and the photosynthesis and respiration of the leaves of plants. At the same time, some related instruments such as the common soil temperature and humidity records The application of instrument in these studies also has a large space.
Using the soil and temperature and humidity recorders as indicators of the early spring in the mountain of purple flowers and snow in the mountain, the response of temperature and photosynthetic rate and transpiration rate to the change of soil temperature under different soil temperatures were studied. . To reveal the suitable soil temperature and temperature range for photosynthetic growth of alpine plants, and to explore the synergy or stress between soil temperature and air temperature effects on photosynthesis and transpiration.
When the soil temperature and air temperature were 20°C and 25°C, respectively, the net photosynthetic rate of the leaves of the Primula amurensis was the highest at 14.67 μmol CO2·m-2·s-1. The optimum soil temperature range for leaf net photosynthetic rate is 15°C～20°C, and the optimum temperature range is 20°C～25°C. The soil temperature and humidity recorder found that the optimum soil temperature range was in line with the monthly mean temperature (15°C) at a depth of 5 cm deep in the in-growth soil, which was lower than that of tomato and amaranth. The temperature with the highest net photosynthetic rate is the same as the dwarf sedge grass that was born at 3200m above sea level.
In a certain range of soil temperature, when the soil temperature rises, it promotes the photosynthesis of the leaves; when it exceeds a certain point, the temperature rise will play an inhibitory role. Under different temperature conditions, the net photosynthetic rate of leaves in the same soil temperature range varies greatly with soil temperature, and even completely different trends appear.
The results of the soil temperature and humidity recorder showed that, when the soil temperature and humidity were controlled under certain conditions, different temperatures had great differences in the photosynthetic rate of the leaves, and the adaptation to the appropriate temperature was completely different. At 10°C~35°C and 15°C, under low temperature and high temperature conditions, the optimum soil temperature at the temperature of 20°C to 30°C in the net photosynthetic rate of Primula amurensis was relatively decreased. At different temperatures, the net photosynthetic rate was the lowest when the soil temperature was 25°C.
Electric Chain Hoist
Maximum
Load:60-10,000kg
The state of
the art VR type electric chain hoist is an indispensable item used in the
light-duty lifting industries across the world, where the characteristic of
reliability is designed into the hoist structure, safety features incorporated
into the operating system, and advanced crafting techniques introduced into the
modern design.
Made for less
volume, lighter weight, and more operating safety and convenience, the chain
hoist has the ability to adapt to various working environment, all available at
a competitive price. Different models offer choices of lifting capacities ranging
between 60kg and 7500kg to suit everyday light-duty lifting work. When used in
combination with manually operated trolley, hand-pushed trolley, or
motor-driven trolley, the hoist can be mounted on the mono-rail traveling
Crane, Jib Crane, and Gantry Crane. This provides a maximum solution to solve
your material handling applications.
VR electric
chain hoist aims to provide customers with highest level of safety and
reliability. Following is a list of standard configurations of the product.
New lifting eye nut with intermediate
teeth for perfect chain drive
Torque limiter
Disk brake for lifting motion
Standard lifting height:3m
Double-speed lifting
Electrical safety devices for upper
and lower lifting position limit
IP55 rated lifting and traveling motor
Tropic-proof
protection (lifting and steering-90 to 95 %)
Galvanized lifting chain
Emergency punch-stop button
Power supply
source:400V/3Ph/50Hz,415V/3Ph/50 Hz,460V/3 Ph/60Hz
Low voltage 48 V command
Speed variation on traveling
Comply with CE directives
The electric
chain hoist is available with various operational components to suit various
applications.
Secondary brake for the lifting motor
Limit switch for traveling
Short headroom trolley
Trolley running on curved track
Dual-speed traveling trolley carriage(20
& 5 m/min)
Slow speed traveling trolley(3 to 10
m/min)
High speed traveling trolley
Additional button on pendant unit
Rain protection
Explosion proof hoist
Reinforced tropic-proof protection
Chain hoist available in a version
that complies with CSA standards
Manual brake release
For any
other special requirements, please contact us.
Electric Chain Hoist
Electric Chain Hoist,European Electric Chain Hoist,Electric Chain Crane Hoist,Chain Hoist With Hook
Eurocrane (China) Co., Ltd. , http://www.craneparts.pl