Eight Oak Tree Growth Characteristics In Response To Simulated Wind Stimulus

The wind is an important environmental factor, which is more complex than the other factor has an effect on the growth of plants. The wind is directly having an mechanical stimulation influence on plant physiological activities, but also on the environment (temperature, humidity, leaf gas concentration change and so o-n) of leaves. In this study, we chose eight species of oaks, Quercus virginiana, Quercus phellos, Quercus coccineaMuench, Quercus texana, Quercus palustris, Quercus acutissima Carruth, Quercus coccinea, Quercus rubra as the research objects. We used modern Physiological equipments and measurements to study whole plant growth, architectures, biomass accumulation and allocation, leaf morphology, leaf movements, photosynthesis, biophysiology in the seedlings of these eight species under different wind. The results are of great significance on the field of plant resistance physiological mechanism, simulation of wind stimulation of physiological and photosynthetic physiological ecology.The main conclusions are as follows:1.Under artificial simulation of the wind, we have studied the the photosynthetic capacity of eight different leaf oak response to the4m/s velocity and6m/s. The results show that:in the W1(4m/s), under W2(6m/s) processing level, Quercus virginiana net photosynthetic rate (Pn) rose, while Pn values of the other7oak species decreased between Quercus virginiana and other7oak trees the significant difference (P<0.01), which can be seen, Quercus virginiana wind stress adaptability significantly stronger than the other seven species.2. Eight kinds of seedling morphology, biomass accumulation and distribution of oak plants to study wind stress responses showed that:Quercus acutissima Carruth., Quercus palustris in the wind stress leaf length, leaf width, leaf area, leaf perimeter were significantly lower, the two treatments compared with the control, Quercus acutissima Carruth., Quercus palustris leaf length were reduced by12%,25.6%and8.4%,21.5%, leaf width were reduced by10.5%,10.8%and20.5%,3.1%, respectively, reduced leaf area14.7%,36.5%and14.1%,31%, leaf perimeter were reduced by12.7%,14.7%and9.9%,14.5%, excluding Quercus palustris leaf width, two species of each index in the two treatments were significantly different. Thus, by reducing the Quercus acutissima Carruth. leaf length, leaf width, by reducing the Quercus palustris leaf length, making the plant leaf area, leaf perimeter reduced, limiting the growth of the space of the blade, in order to reduce the pressure of the wind causing. 3. In the spatial configuration, the angle between the Quercus rubra roots W1, W2treatment respectively, compared with the control increased by42.4%,67.7%. Quercus texana, Quercus acutissima Carruth., Quercus coccinea handle angle between the two branches were reduced compared with the control22.3%,21.1%,15.4%and21.4%,19.2%,9.9%. Quercus acutissima Carruth., Quercus palustris collateral angle between the two treatment compared with the control decreased by14.5%,11.2%and21.3%,24.9%. Quercus phellos shoots two treatment compared with the control increased by18.1%,42.6%. Quercus coccinea Muench collateral length in wind stress treatment compared with the control decreased by35.2%,21.1%.Quercus virginiana collateral length two treatments were compared with the control increased102.7%105.9%. Thus, a different species to take a different approach to adapt to changes in the external environment of the wind. Quercus acutissima Carruth., Quercus palustris collateral primarily by reducing the angle between the branches closer to the trunk twig growth momentum generated to reduce the impact of the swing process, and the contact area of the canopy and wind to reduce air resistance, reduced wind plants in the environment vibration frequency and improve safety. And Quercus texana, Quercus coccinea primarily by adjusting the angle between the petiole and the lateral branches, changing the angle of the blades, the blades so that the contact area with wind reduction, reduce wind damage to the blade. Quercus rubra roots mainly by increasing the angle to resist wind stress.4. Eight kinds of analysis oak tree leaf anatomy shows that the Quercus rubra, Quercus palustris Increase wood thickness and the thickness of the main vein, compared with the control treatment W1treatment were higher than W2treatment, increased by49.4%,44.1%,34.4%and18.5%,23.3%,27.9%; while Quercus phellos, Quercus coccinea wood thickness reduction compared with the control W1treatment were higher than W2treatment, were reduced by20.9%,19.2%and11.7%,12.2%; reduce Quercus acutissima Carruth., Quercus texana palisade tissue thickness, compared with the control W1treatment of Quercus acutissima Carruth. was higher than W2treatment, were reduced by12.8%,12.2%, W1treatment of Quercus texana lower than W2treatment, decreased by8.3%,28.6%. Thus, Quercus rubra, Quercus palustris growth mainly through the xylem to enhance the hardness of the blade to resist wind stress. The Quercus phellos, Quercus coccinea wood thickness decrease is mainly through the reduction of resources allocated to the xylem growth, leaves become smaller and more flexible in order to escape the wind stress.In conclusion, this research thinks, eight species of oak under blowing environment in different wind through the change of whole plant and leaf traits in response to changes of the environment, reflects the plant through multiple aspects of adaptation and adjustment, to ensure the normal growth and survival in different wind environment.