|其他摘要||With the increase of the content of carbon dioxide in the atmosphere,with the global climate changing,the warming trend of climate is more and more obvious,so the resulting problem is becoming more attention.As the ecosystem of arid and semi-arid is more fragile than that of humid and semi-humid.So the response of arid and semi-arid to climate change and human activity is more sensitive than that of humid and semi-humid area.So it has an important significance to discuss and analysis the land gas interaction in the arid and semi-arid area,including the energy balance and the law of carbon exchange.
This paper used the data of Kyrgyzstan tank Zi er Su Shan from August 13th 2014 to November 12th 2014.This paper has analyzed the degree of the energy balance of the study area during the period of observing time by two methods,including the residual energy balance(D) and the energy balance ratio(EBR),besides,it has analyzed the law of carbon exchange and the factors,which influenced the carbon flux.And the key conclusions are as fallowed:
(1)The solar radiation is the main source of the terrestrial ecosystem,and its main forms are the effective energy and the turbulent energy.During the period of observing time,the effective energy was bigger than the turbulent energy,as well,the latent heat flux was bigger than the sensible heat flux of the turbulent energy.Through analyzing the study area’s D and EBR,it found that the energy was not closed.During the period of observing,from the daily variation curve of the energy balance residual, the energy balance residual (D) was beyond 0 from the 8:00 to 16:00 of the day,and it was 0 at 8:00 and 16:00,which meant that the energy kept balance at 8:00 and 16:00.However,the EBR of the study area were 0.75,0.70,0.85,1.02,respectively in August,September,October and November.
(2)During the period of observing,the study area belonged to carbon source from the monthly mean of carbon flux.And the diurnal variation curve of carbon flux presented V,overall,the carbon flux was negative from 9:00 to 17:00 in the daytime,which meant that
the study area was carbon sink at this period of time.
(3)With the net radiation increasing,the change of the carbon flux was obviously decreased,besides,it was negatively correlated with the latent heat flux.There was a positive correlation index between the absorption of the carbon and the photosynthetic active radiation.Besides,the relationship between the amount of carbon emissions and the soil temperature was positive correlation index in the nighttime.|