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The photosynthetic active radiation instrument equipment is installed on the observation tower with a height of 50m, and the long-term observation data of the 5-layer photosynthetic active radiation sensor on the observation tower are selected for analysis. I, QS70-10 installation height is 2,4} 8} 12m and 16m, installation orientation for the branch arm length of 1.5m, fixed in the west of the tower, the horizontal arm extends to the south. The 16m height is above the crown of the rubber forest and represents the maximum photosynthetically active radiation of full sunlight, which is the maximum photosynthetically active radiation, and the height of 12m represents the photosynthetically active radiation at the top of the forest canopy (partial canopy above 12m due to the growth of rubber forest). 8m is the photosynthetically effective radiation below the canopy, 4m is the photosynthetically active radiation below the rubber Linzhiya (a very small amount of shrub layer top), and 2m is the photosynthetically effective radiation amount of the herbaceous layer on the surface.
In order to make observations more representative and avoid individual observation points affected by clouds or light spots, I, QS70-10 probes are evenly distributed with 10 sensors. The observation result of each probe is the average value of P1R in the 1m space. Effective radiometers can effectively reduce the observation errors of spatial differences. In addition, long-term positioning observations can also reduce the impact of foliage swings, clouds, or flares, and can eliminate the temporal and spatial variability of Pl1R at different heights due to weather conditions and the influence of solar elevation angles, reflecting longer-term climate conditions and rubber Changes in the canopy index of the canopy layer, and variations in Pl1R caused by changes in canopy thickness and phenological changes at different heights.
The photosynthetic active radiometer is used for continuous observation, and the data collector automatically records the data. The sampling frequency is 0.5 Hz, and the output data is the 30-minute average and daily total value processed by the instrument. Using the 365d observation data for the entire year of 2010, the monthly change of Pl1R was calculated using the 30-minute total monthly total.
Through the measurement and analysis of photosynthetically active radiometers, the photosynthetically active radiation of rubber layers under the forest is affected by the photosynthetically active radiation of the canopy, which is affected by the leaves of the branches and the greater the effect of the upward movement. As a rubber plantation in a pure plantation community, there are few shrubs under the forest because of its distinct structure. Therefore, it has great feasibility for the development of under-forest planting.
Photosynthetic Effective Radiometer Analysis of the Feasibility of Rubber Undergrowth Space Development
The most important thing for photosynthesis of plants is the radiation of the sun, but not all the radiation can be used by plants. Only the 400-700 nm band energy can be effectively used. This is the so-called photosynthetically active radiation. Photosynthetically active radiation is the most basic energy source for plant life activities, organic matter synthesis, and yield formation. Therefore, it is of great significance for the determination of photosynthetically active radiation in the development of agricultural forestry. For the understory environment, photosynthetically active radiation is an important ecological factor, which directly restricts the species, growth, and distribution of understory vegetation. Therefore, the determination of photosynthetically active radiation in rubber forests has a guiding role in its development and utilization. For the determination of this parameter, a photosynthetic active radiation meter can be used.