中國內(nèi)蒙古溫帶典型草原植物物候?qū)邓窬指淖兊捻憫?yīng)
[Abstract]:With the advancement of the human industrialization process, the global climate has changed significantly. The concentration of carbon dioxide in the atmosphere is raised and thus results in a change in the climate warming and the resulting precipitation pattern. A large number of control experiments and model predictions show a significant increase in extreme precipitation events in the future, including extreme drought and extreme flooding. Plant phenology is one of the most sensitive indicators for climate change response and has been used as an indicator of plant response to climate change. Previous studies have been focused on the effects of drought or rain on the phenology, and the lack of systematic knowledge about the effect of precipitation pattern on the phenological effects of plants. Semi-arid grassland is one of the main ecosystem types of precipitation limitation. The change of plant phenology in future climate change scenarios is not clear. In order to study the response of plant phenology to global change in semi-arid grassland, we designed a control experiment including seven precipitation gradients (20%,40%,60%, natural rainfall,20%,40%,60%) in the semi-arid grassland of Inner Mongolia in 2010-1012. In order to study the recovery and recovery of vegetation after water disturbance, we stopped the precipitation gradient treatment in 2013. In this experimental platform, we selected three dominant species in the late season of 2012 and studied 10 common species in the community in 2013-2014. The results show that: (1) In the year of treatment (2012), the phenology of different species has a differential response to different rainfall gradients. The effect of precipitation on the flowering stage of Stipa grandis was delayed by 60%. There was no significant response to the change of the precipitation gradient. This may be due to the fact that the cold artemisia is a semi-shrub, the root system is developed, the absorption capacity is strong, and thus the change of the environment moisture is not sensitive. The flowering time of the rough and hermit grass is in advance under the conditions of rain-reducing and rain-increasing, which may be due to the short stature of the plant itself, and the demand for light may be larger than the water demand. (2) The response of the plant phenology to the previous treatment in the recovery year is different from that of the treatment year. In 2013, the flowering time of the Stipa grandis in the drought treatment was 11.2 days earlier than that in the control (P0.001), which may be due to the decrease in the degree of community coverage and the reduction of the number of certain species due to the early treatment, The competition pressure of the Stipa grandis is lower than that of the control. In addition, when the water content is no longer restricted during the recovery period, the competition of the plants to the underground is converted into the competition of the ground light, the plants of the Stipa are higher, the competition advantage of the light is strong, and the growth of the plants is more rapid. And (3) the whole flowering period of the plant community is advanced in the recovery stage. In the period of drought recovery (2013-2014), the early flowering of grass and non-grass was 2.3 (P0.05) and 0.9 days (P0.01), and the early flowering and late flowering species were flowering 1.9 (P0.05) and 2.2 days (P0.05). This indicates that there is an advance in the whole community level, which may be due to an evolutionary adaptation to the drought response in the drought-affected Inner Mongolia grassland, and to avoid the drought by early flowering. Our experiment shows that under the condition of the change of precipitation, the response of different plants to the change of precipitation is different due to the height of the plant and the water absorption of the root system. In the recovery period, the community level is advanced as a result of the rapid evolution adaptation of the plant to the drought environment. The mechanism is beneficial to the rapid adaptation of plants to the production of the ecosystem after drought stress. This study provides some data support for phenological prediction in the background of global change, and has certain guiding significance to the local grassland ecosystem management.
【學(xué)位授予單位】:河南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:S812
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