The Study On Micro-climate Of Mixed Forest Platycladusorientalis And Prunusdavidiana In Different Semi-arid Of XiaoLangDi Area

The Jiyuan Xiaolangdi storehouse district belongs easily the ecology vulnerable area which destroys, is the Henan Province Huanghe River valley soil erosion most serious region. In recent years, along with the population growth, the resource development and the large-scale production construction, the soil erosion intensified day , the ecological environment worsened unceasingly, the drought and flood disaster was very frequent, has restricted the local economy development and the living standards enhancement seriously. In addition, the environment destruction, increased the reservoir silting-up rate, will thus have the very tremendous influence to the dam, the habitat will degenerate, the ecosystem multiplicity will reduce, the ecological equilibrium will receive the destruction, not only for, when the region environment and the lives of the people will bring the very tremendous influence, will also have the very tremendous influence to the downstream ecological environment. Improves and restores this area the ecological environment to become one item urgent and the arduous duty. As a result of the long-term man's activity, Mt. Taihang area natural vegetation destruction is serious, its result not only changed the natural habitat and the species composition, and has also affected the light, the soil moisture as well as the soil fertility and so on important ecological environment essential factor .Therefore, how to enhance the vegetation restored when the soil moisture content to become the key question. Therefore completes when the mountainous region arid half arid condition the vegetation restores the choice tree seed must first consider is the drought resistance.This experiment restores the initial period stage mixed forest from the vegetation the microclimate to begin to analyze the tree seed to choose whether has the promoter action is not the inverse correlation competition function at least. Replied whether the Prunus davidiana can play the protective function to the initial period Platycladus orientalis, whether suitable to take under the arid half arid mountainous area condition Platycladus orientalis's associated protection tree seed. And which through analyzes this kind of protection to the microclimate research the basis to have. Thus to build the strong forest ecosystem, safeguards the forest each kind of ecology function fully the display, to realize forest ecosystem's sustainable management to provide the theory support finally, hoped that can speed up this local through this research the ecology degeneration prevention step, the improvement ecological environment, realizes the human and the natural harmony and the sustainable development provides the science the theory basis. Provides some theories with this local type close area condition of local growth close region to use for reference. This experiment tests the base Platycladus orientalis and the Prunus davidiana mixed forest camp in the Xiaolangdi storehouse district makes the initial period stage, the Platycladus orientalis and under the Prunus davidiana different shade density's mixed forest makes the microclimate observation to the mixed forest, what choice model is in May spring and in October autumn this kind of sunny calm weather condition, judges in the low temperature time Prunus davidiana to the Platycladus orientalis the protective effect.This research's main conclusion is as follows: In the Jiyuan Xiaolangdi storehouse district Prunus davidiana and under the Platycladus orientalis mixed forest Succession initial period stage the Platycladus orientalis and the Prunus davidiana density in 0.25 sector scopes, the illumination looking from the observation data, the temperature, the ground temperature, the transpiration, the leaf blade temperature, photosynthesizes aspects and so on speed to display only surpasses the Platycladus orientalis pure crop and the shade density achieves 0.85 above mixed forests. And under this shade density sector, can at ground temperature low time compares the Platycladus orientalis pure crop to enhance the temperature effectively. And is highest in the observation temperature, can effectively the reduced temperature, thus reduces the high temperature some injuries which creates to the adult plant. The data demonstrated that descends the mountain the peach in this shade density to have the promoter action which to the Platycladus orientalis is related.