内蒙古草原温室气体交换通量
发布时间：2018-10-08 16:17
【摘要】：草地生态系统是地球上十分重要的陆生生态系统,内蒙古草原在我国草地生态系统中占有重要地位,其在全球温室气体收支平衡中扮演重要角色。统计分析内蒙古地区34个观测地点的多年(1995—2012)温室气体观测数据,得到内蒙古3种主要草原类型(草甸草原、典型草原、荒漠草原)主要温室气体(CO2、CH4、N_2O)的年度或生长季平均通量并据此判断其温室气体源汇类型,并选择内蒙古草原中分布最广泛的典型草原的温室气体交换通量与环境因子进行相关性分析。结果显示,典型草原、荒漠草原表现为CO2交换源汇动态变化的过程(生长季交换通量分别为(-4.26±15.57)mg C m~(-2)h~(-1)、(-42.5±5.42)mg C m~(-2)h~(-1)表现为汇,年度交换通量分别为(20.64±11.54)mg C m~(-2)h~(-1)、(18.04±2.48)mg C m~(-2)h~(-1)表现为源),草甸草原CO2年度交换通量为(-10.31±1.15)mg C m~(-2)h~(-1)表现为汇;草甸草原、典型草原、荒漠草原CH4年度交换通量分别为(-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),均表现为CH4的汇、N_2O年度交换通量分别为(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),均表现为N_2O的源。在典型草原温室气体交换通量与环境因子的相关性分析中发现,CH4平均吸收通量与降水量(P0.05)、土壤湿度(P0.05)、土壤温度(P0.01)有显著或是极显著线性正相关关系;CO2平均通量与降水量(P0.01)、土壤湿度(P0.01)、叶面积指数(P0.01)有极显著线性负相关关系,与气温(P0.01)有极显著线性正相关关系;N_2O平均通量与降水量(P0.05)、土壤湿度(P0.05)、气温(P0.01)有显著或极显著的线性正相关关系。
[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 卤15.57) mg C m-2) h-1), (-42.5 卤5.42) mg C m-2, respectively. The annual exchange fluxes were (20.64 卤11.54) mg C m-2) h-1), (18.04 卤2.48) mg C m-2 h-1, and the annual exchange fluxes of meadow steppe CO2 were (-10.31 卤1.15) mg C m-2 h-1). 鑽掓紶鑽夊師CH4骞村害浜ゆ崲閫氶噺鍒嗗埆涓，
本文编号：2257424
[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 卤15.57) mg C m-2) h-1), (-42.5 卤5.42) mg C m-2, respectively. The annual exchange fluxes were (20.64 卤11.54) mg C m-2) h-1), (18.04 卤2.48) mg C m-2 h-1, and the annual exchange fluxes of meadow steppe CO2 were (-10.31 卤1.15) mg C m-2 h-1). 鑽掓紶鑽夊師CH4骞村害浜ゆ崲閫氶噺鍒嗗埆涓，
本文编号：2257424
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