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Water And Carbon Exchange And Environmental Controls Of Plantation In The Xiaolangdi Area

Posted on:2019-04-03Degree:MasterType:Thesis
Country:ChinaCandidate:Y N WuFull Text:PDF
GTID:2393330575491701Subject:Forestry
Abstract/Summary:PDF Full Text Request
The water cycle and carbon cycle are the key to study the energy cycle of the ecosystem,and the study of the water carbon exchange of plantations occupies an important proportion in the study of the global ecosystem material cycle.In this paper,the vorticity correlation method is used to analyze the daily and seasonal characteristics of the water and CO2 flux in in Xiaolangdi area,which is typical of the characteristics of low hills in North China,and the environmental responses to determine the carbon budget of the plantation ecosystem.Forest water consumption and its environmental impact factors.Understand the ecosystem water,carbon exchange management and energy transfer process of plantation ecosystem,and provide theoretical support for the management and management of plantation forest.The main conclusions obtained through the study are as follows:1.Using the energy balance ratio(EBR)method,the energy closure of the plantation ecosystem in the study area was 76.52%through the analysis of the energy closure of the artificial forest ecosystem in the low hilly region of North China,indicating that there was energy loss during the observation process.Case.It is more suitable to use the plane coordinate rotation method to rotate the coordinate system by comparing the turbulence mass.2.Daily and seasonal analysis of the CO2 flux of the plantation ecosystem to determine the carbon budget of the plantation ecosystem.The seasonal variations and monthly variations of CO2 flux of the artificial forest ecosystem in the low hilly region of northern China during 2014-2016 all showed a clear trend of the change of the single peak curve,and there was a clear seasonal trend.The plantations in 2014 and 2016 were The NEE ranges from-13.89?14.81 ?-32.75?9.61gCO2m-2d-1 and-34.24 to 9.6 g C02 m-2d-1.In the main growing season(May-September),the plantation ecosystem has strong carbon sequestration capacity,and the annual net carbon absorption is 595.82 g·m-2.3.Fitting the net productivity and photosynthetically active radiation of artificial forest ecosystem in the Xiaolangdi area.The maximum and minimum values of Pmax obtained in 2014 and 2016 were 1.04 and 2.42 mg·m-2·s-1,respectively,and the maximum alpha value for model simulations is 0.022 ?mol·mol-1.The respiration of artificial forest ecosystems in the hilly areas of North China is greatly affected by the soil temperature.Models of night-time respiration and soil temperature were obtained by fitting.4.The total annual evapotranspiration in 2014 was 578.39mm.The maximum water vapor fluxes on the mean monthly days of 2014 and 2016 were 0.617 mm·h-1 and 0.45 mm·h-1,respectively,and the minimum values were 0.0003 mm·h-1 and 0.0001 mm·h-1,respectively.Before and after the sunrise 06:00-08:00,the evapotranspiration began to show a significant upward trend.After gradually increasing to the highest point,the evapotranspiration began to decline,approaching 0 at 18:00-20:00,and then gradually decreasing.There was a positive correlation between evapotranspiration and temperature,net radiation total,saturated vapor pressure difference,and wind speed.The evapotranspiration of artificial forests also increased.Among them,the relationship between temperature and evapotranspiration fitted the highest correlation.Therefore,the meteorological factors and potential evapotranspiration were the highest.
Keywords/Search Tags:Vorticity-related, carbon flux, water flux, artificial forest ecosystem
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