The Study Of The Relationship Between Quercus Carbon And Nitrogen Metabolism And Tissue Renewal Capacity

Quercus aquifolioides forest is a very special sub-alpine vegetation sclerophyllous oak forest type, which is widely distributed in the Mountains, and is one of the main types of forest ecosystems. Mountain oak genus Quercus is the more primitive Group, which is widely distributed in the cross-sectional area which is extremely important ecological functional area along the Yangtze River region and in western China, is the largest number of natural forest areas, is also a natural barrier to the upper Yangtze River region; because of the local ridge valley height disparity, soil erosion is very severe and there are frequent natural disasters, fragile ecological zones is one of the seven mountain valley southwest of fragile ecological zones. Quercus forest area developed, is also very rich in species, most located in poor soils, drought, cold, little rainfall, and strong ultraviolet radiation very poor site conditions, which is very difficult for other species to adapt to extreme environments Conditions, due to their own unique form of cold drought conditions, a transverse mountain shrub Quercus forest communities in the species and the dominant species at high altitude on the mountain range, the maintenance of the stability of fragile ecosystems and have a very important ecological function for the Jinsha River, Minjiang River, the Lancang River, Nu River and the source of the Brahmaputra and other rivers'water conservation and soil conservation.Initiation refers to the plant continues to maintain an effective way of regeneration by natural or human disturbance. It means a lot to community protection and forest restoration, secondary forest protection, operation and management. Different disturbances and interference strength have different effects on the initiation of plant communities. Initiation of plant regeneration niche is part of the regeneration as a direct way, initiation update attracts more and more attention. This study selected the mountainous western Sichuan off widespread Quercus shrub as an object, compare different organizations of the growing season plant non-structural carbohydrates (NSC) and nitrogen changes in the characteristics of the response of its relationship with altitude; mountain shrub Quercus cut at different levels of artificial interference of more natural conditions and human disturbance at different elevations under shrub Quercus initiation renewal, we determined the disturbance (logging) strength (logging The number of stubble height), the shrub Quercus NSC content of the organization and dynamic changes of total nitrogen content, verify that the "moderate artificial disturbance can promote initiation update "and"base line storage and root initiation of non-structural carbohydrates Update force is related to "scientific hypothesis.The results show that under natural conditions, at different times, Quercus NSC content of the various organizations is larger underground than above ground, which may indicate a Quercus root is the main area for carbon storage. In addition Quercus tissue content of dormant vary a lot from underground to above ground, while other times the content gap become smaller can also explain the problem. Quercus, as shown in the dormant period decreased with elevation, but in the bud period, growth period and the growth of late period has emerged as elevation increases; the former may be because NSC is the main suppliers of carbon when it starts to grow after dormant period and has a cushion effect in plant photosynthesis; Quercus need to store large amounts of NSC before the arrival of the dormant period, but as the elevation and inappropriate environmental conditions, low temperature led to growth inhibition, Quercus NSC storage capacity becomes more difficult; while the latter may be due to high altitude temperature, competition and other environmental conditions, Quercus life activities such as respiration decreased and the consumption the NSC reduced, so the NSC stored to the root is higher than lower altitudes.The survival of the Timberline seedlings (<50 cm) and early growth is controlled by micro climate control near surface, with saplings height increases (>50 cm), the growth of the aerial part is partially controlled by increasing the heat level. This may be the reason why the NSC of the organizations showed no significant difference between high altitude and low altitude above ground. With the increase in elevation, NSC content of some of the organizations above ground in different seasons shows nonlinear performance, no significant changes in law. In addition, the dormant period almost all of the organizations of Quercus' total nitrogen content decreased with increasing elevation, while other times change is inconsistent. This result may reflect the NSC and nitrogen content vary according to the altitude, but also means that the Quercus' underground organization NSC is more sensitive to temperature change.Under conditions in the artificial cut, cutting 70% of the shrub Quercus make initiation ability stronger, verify the hypothesis that "moderate interference can contribute to the initiation of artificial update", which provide a theoretical basis for the reconstruction of vegetation and ecological and biological protection of biodiversity. Initiation of vegetation provided good test materials and methods to test initiation renewal theory. The study of initiation renewal theory and production practice combination should be enhanced. V...