Studying The Dynamic Of The Soil Organic Carbon Of Main Forest Types In Qinling Mountains In Shaanxi Rpovince With Rothc Model

Since the industrial revolution, atmospheric CO2concentration increase caused a global issue of common concern by global warming. Scientific research shows that:the violent rise of global temperatures is the reason of the increase in emissions of greenhouse gases such as CO2and CH4which directly led to changes in emissions from the Earth’s surface radiation to space, that causing the Earth’s surface temperature rise and creating the world climate change. The soil is the core of the terrestrial ecosystem, connected to the atmosphere, hydrosphere, biosphere and lithosphere. Soil organic carbon pool is the largest carbon pool in terrestrial ecosystems and acts an important part of the global circulation. It is also a dominant position in the global carbon budget. Therefore, understanding the changes in incentives for soil carbon cycle is the premise of the study about terrestrial ecosystem carbon cycle. We used the meteorological data of the Qinling Mountains area and the RothC model of Rothamsted Experimental Station to simulate the the Qinling main forest ecosystems of soil organic carbon dynamic changes of ecosystem, and then give the management policies and measures about the Qinling Mountains area.Firstly, the writer used the method of two-step acid hydrolysis with H2SO4to analysis the DPM and RPM of the plant litter. The range of DPM/RPM ratio of the main forest types in the Qinling is0.45-1.22; The Betula platyphylla is the highest ratio1.22; The Larix principisi is the lowest0.45. The average DPM/RPM of the Qinling forest is0.756.After we got the DPM/RPM ratio of Qinling main forest types, we made the reasults accord to the meteorological data of the Qinling Mountains, using RothC model to simulate the dynamic changes of soil organic carbon of the major forest types in Qinling Mountains. We found that the sequence of the soil organic carbon increase of the Qinling forests in2000-2020is Quercus aliena var. acuteserrata (10.887025t·ha-1)> Betula platyphylla (10.367215t·ha-1)> Abies fargesii (8.81595t·ha-1)> Pinus tabulaeformis (3.7719t·ha-1)> Larix principisi (3.43719t·ha-1). The sequence of the net increase of the soil organic in the different types of soil in the northern slope of Qingling is:Leaching brown soil> brown soil> dark brown soil. The sequence of the net increase of the soil organic in the different types of soil in the southern slope of Qingling is:yellow cinnamon soil> yellow brown soil> brown soil> dark brown soil.Through analysis the reasult of the simulation data, we found that the increase in soil organic carbon in different forest types in the Qinling and the time has a significant correlation. The equation between the increase in the amount of soil organic carbon (y) and time (x) is as follows: y=ax2+bx+cThe equation of soil organic carbon in annual net increase is: Y=aebxIn this study, we change the different altitude climatic conditions in the model. We analysis the dynamic changes of soil organic carbon in major forest types. And we found that the equation between the soil organic carbon increase (y) and altitude increment (x) is: y=ax+b...