【摘要】：草地生態(tài)系統(tǒng)是地球上十分重要的陸生生態(tài)系統(tǒng),內(nèi)蒙古草原在我國草地生態(tài)系統(tǒng)中占有重要地位,其在全球溫室氣體收支平衡中扮演重要角色。統(tǒng)計分析內(nèi)蒙古地區(qū)34個觀測地點的多年(1995—2012)溫室氣體觀測數(shù)據(jù),得到內(nèi)蒙古3種主要草原類型(草甸草原、典型草原、荒漠草原)主要溫室氣體(CO2、CH4、N_2O)的年度或生長季平均通量并據(jù)此判斷其溫室氣體源匯類型,并選擇內(nèi)蒙古草原中分布最廣泛的典型草原的溫室氣體交換通量與環(huán)境因子進行相關(guān)性分析。結(jié)果顯示,典型草原、荒漠草原表現(xiàn)為CO2交換源匯動態(tài)變化的過程(生長季交換通量分別為(-4.26±15.57)mg C m~(-2)h~(-1)、(-42.5±5.42)mg C m~(-2)h~(-1)表現(xiàn)為匯,年度交換通量分別為(20.64±11.54)mg C m~(-2)h~(-1)、(18.04±2.48)mg C m~(-2)h~(-1)表現(xiàn)為源),草甸草原CO2年度交換通量為(-10.31±1.15)mg C m~(-2)h~(-1)表現(xiàn)為匯;草甸草原、典型草原、荒漠草原CH4年度交換通量分別為(-30.48±9.57)μg C m~(-2)h~(-1)、(-41.25±3.61)μg C m~(-2)h~(-1)、(-85.00±51.03)μg C m~(-2)h~(-1),均表現(xiàn)為CH4的匯、N_2O年度交換通量分別為(28.40±7.27)μg N m~(-2)h~(-1)、(3.18±0.91)μg N m~(-2)h~(-1)、(2.51±0.67)μg N m~(-2)h~(-1),均表現(xiàn)為N_2O的源。在典型草原溫室氣體交換通量與環(huán)境因子的相關(guān)性分析中發(fā)現(xiàn),CH4平均吸收通量與降水量(P0.05)、土壤濕度(P0.05)、土壤溫度(P0.01)有顯著或是極顯著線性正相關(guān)關(guān)系;CO2平均通量與降水量(P0.01)、土壤濕度(P0.01)、葉面積指數(shù)(P0.01)有極顯著線性負相關(guān)關(guān)系,與氣溫(P0.01)有極顯著線性正相關(guān)關(guān)系;N_2O平均通量與降水量(P0.05)、土壤濕度(P0.05)、氣溫(P0.01)有顯著或極顯著的線性正相關(guān)關(guān)系。
[Abstract]:Grassland ecosystem is a very important terrestrial ecosystem on the earth. Inner Mongolia grassland plays an important role in the grassland ecosystem of China and plays an important role in the balance of global greenhouse gas budget. Three main grassland types (meadow steppe, typical steppe) in Inner Mongolia were obtained by statistical analysis of greenhouse gas observation data from 34 observation sites in Inner Mongolia (1995-2012). Desert steppe) the average annual or growing season flux of the main greenhouse gases (CO2,CH4,N_2O) and the types of greenhouse gas sources and sinks, The relationship between greenhouse gas exchange fluxes and environmental factors in Inner Mongolia steppe, which is the most widely distributed typical steppe, was analyzed. The results showed that the typical steppe and desert steppe showed a dynamic process of CO2 exchange source and sink (exchange fluxes in growing season were (-4.26 鹵15.57) mg C m-2) h-1), (-42.5 鹵5.42) mg C m-2, respectively. The annual exchange fluxes were (20.64 鹵11.54) mg C m-2) h-1), (18.04 鹵2.48) mg C m-2 h-1, and the annual exchange fluxes of meadow steppe CO2 were (-10.31 鹵1.15) mg C m-2 h-1). 鑽掓紶鑽夊師CH4騫村害浜ゆ崲閫氶噺鍒嗗埆涓，

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