Study Of Wetland Hydrological Dynamics And Influencing Factors In Jinchuan Peatland, Under The Background Of Global Climate Change

Hydrology is the key feature in wetland ecosystem,which plays a critical role indefinition the wetland ecosystem.Hydrologycould affected the soil and biology by changing the physical and chemical environment.The study of wetland hydrological process can be seen the significant fundamental in wetland ecological research.There is many factor could influenced wetland hydrology,climate,geomorphology,geology,biology,human activity and so on.Due to the global climate change,global warming and frequent droughts could affected the fragile hydrological environment.In older to affected the whole ecosystem.InthisstudyJinchuan peatland was selected as the research area and study time was between 2011 and 2014.By the condition of global climate change,analyzed the relationship between the water level andprecipitation.The analyze result was correlation with vegetationcharacteristics(biodiversity,biomass,coverage),outside interference(distance from river),topographycharacteristics(height)and soil properties(bulk density),which is try to find out reason of the hydrology from in Jinchuan peatland.Analysis of the correlation between water level and conductivity,suggesting that the impact on the ecosystem level mechanism,the main results are as follows:(1)Regional annual precipitation cyclical wet and dry seasons change,fluctuation cycle approximately 3--5 years.The precipitation mainly in small to moderate rain,the frequency of more than 80% of the total contribution rate of rainfall precipitation total of more than 50%.While under the influence of global climate change,the frequency of heavy precipitation and droughts are on the rise,up 0.0547 and 0.0046 percentage points per year,respectively.(2)Water level in Jinchuan peatland was affectedby precipitation fluctuate.Water level in eastern edge of the Jinchuan peatland most superficial and volatility;while in southern lowland water level was highest and stable.In the center area of Jinchuan peatland water level more stable,which the average water level near the surface.The rising stage of water level was positively correlated with the daily precipitation.(3)Different frequencies affect precipitation level presents a different dynamic characteristics.Intensive precipitation on wetland disturbance is small and maintains stable water level in wetland,while the dispersion uneven precipitation had a bigger disturbance in wetland water level.We can infer that by the condition of global climate change andthe increase in heavy precipitation and drought simultaneously,wetland water stability will be negatively affected.(4)Different intensity of precipitation on the wetland water level impact shows different.Heavy precipitation has greater fluctuations in water level than weak precipitation.After heavy precipitation water level down from the peak,which the rate of decline from about 2 mm/h down to about 0.3 mm/h.While after weak precipitation the rate of decline will maintain approximately in 0.3 mm/h.Wetland water level volatility in heavy precipitation.Due to global climate change,the heavy precipitation is increasing,which can influence the wetland hydrological disturbance intensifies.(5)The dynamic of water level were affected by topography,outside interference,vegetation characteristics,soil permeability and other factors.Water depth decreases with increasing surface elevation,which low lying area easy to aggregation precipitation manifested as the high water level.River has significantly influence on wetland water level dynamic.The most dramatic level fluctuation was find in eastern region near the river.The higher abundance of vegetation,lower biomass,the more stable of water level.Furthermore,the lower soil bulk density,permeability is better,more stable level.Bulk density in Jinchuan wetland is increases with depth.Topsoil is the active layer in wetland water level fluctuations,which approximately 0~20cm.(6)Water conductivity and water level has significant negative correlation in Jinchuanpeatland,with the wetland water level rises,the conductivity decrease.Dynamic changes of water level in the soil redox environment,in older to influence microbial decomposition of organic matter releasing inorganic salts and microbial survival.This causing changes in water chemistry,as a rustle of elevating in electrical conductivity.Water level volatile area,high conductivity,namely high salt.Due to global climate change,water level stability is poor.This will lead to wetland soil Stalinization,in older to affect the growth and wetland vegetation community succession.