Effects Of Warming And Precipitation Enhancement On Soil And Plant Carbon And Nitrogen Of Alpine Meadow Ecosystem

With the greenhouse effect, global warming lead the climate change,as well as the change of rainfall pattern.Alpine meadow ecosystem will experience a greater degree of warming and changing rainfall conditions. Warming and the change in precipitation affect the growth process of carbon and nitrogen in soil and plants. In this study, using OTC simulated warming, increased precipitation simulated artificially added precipitation. We set warming, increased precipitation, while warming and increased precipitation,in natural conditions these four treatments. The text was begin from 2013 early May to October 2015,lasted for three years.In 2015 May-October were measured soil soluble organic nitrogen, soil soluble inorganic nitrogen,soil dissolved organic carbon, soil organic carbon, soil total nitrogen, and plant above and below ground biomass and carbon and nitrogen plant, research and analysis of the warming, increased precipitation and simultaneously warming and increased precipitation on soil soluble organic nitrogen, dissolved inorganic nitrogen, dissolved organic carbon, organic carbon and total nitrogen impact; warming and increasing influence of precipitation on plants and plant above and below ground biomass carbon and nitrogen, and to explore the correlation coefficient and the carbon and nitrogen plant and soil carbon and nitrogen in alpine ecosystems and environmental factors in soil carbon and nitrogen soluble correlation. We obtained the following conclusions:(1) Warming significantly reduce 0-10 cm soil moisture, precipitation increased significantly increase 0-10 cm soil moisture, precipitation warming increase synergy effects on soil moisture was not significant. Significantly reduce the warming10-20 cm soil moisture in August and September, an increase of precipitation improved significantly 10-20 cm soil moisture in August and September, warming and increased precipitation synergies on 10-20 cm soil moisture Not obvious.(2) Warming, increased precipitation and warming increases precipitation synergies no significant effect on soil dissolved organic carbon, soluble nitrogen, dissolved organic nitrogen, ammonium nitrogen, nitrate nitrogen and soil net ammonificationrate and net nitrification rate.(3) 0-10 cm soil water content and soluble nitrogen, dissolved organic nitrogen,ammonium nitrogen, nitrate and dissolved organic nitrogen and a significant positive correlation, 10-20 cm soil water content and soluble organic nitrogen significantly positively correlated with ammonium was a significant positive correlation.(4) Increased precipitation has been significantly increased plant biomass 0-10 cm soil,no significant effect on the aboveground biomass and 10-20 cm plant biomass.Warming and increased precipitation warming synergies no significant effect on plant biomass.(5) Warming, increased precipitation and warming at the same time increasing the precipitation had no significant effect on soil and plant organic nitrogen, total nitrogen content. Increased precipitation treatment plant total nitrogen content was significantly higher than the warming process.