摘要
【目的】定量分析艾比湖地区荒漠草地和胡杨林地土壤甲烷排放通量的日变化,探讨影响土壤CH4排放的主要环境因子,为该地区环境因子对荒漠生态系统土壤CH4排放的影响提供一定的数据支持。【方法】采用静态暗箱法结合Li-7 700快速CH4分析仪测定荒漠草地和胡杨林地土壤生长季的甲烷排放通量,同步进行气温、风速、大气相对湿度等环境因子的观测。【结果】观测期内荒漠草地的平均通量为2.19μg/(m2·s),最大值为48.96μg/(m2·s),最小值为-38.58μg/(m2·s);胡杨林地的平均通量为-0.96μg/(m2·s),最大值为36.15μg/(m2·s),最小值为-16.82μg/(m2·s)。荒漠草地CH4排放具有较明显的昼夜变化,呈双峰曲线;胡杨林地则不明显。荒漠草地、胡杨林地土壤CH4通量排放与不同深度土壤温度之间没有固定的关系。荒漠草地甲烷通量与不同深度土壤温度的相关性高于胡杨林地,且呈极显著相关(P<0.01),而地表温度与甲烷通量相关性不强;大气相对湿度和风速与甲烷通量日变化之间相关均不显著。【结论】观测时间内的甲烷排放通量几乎为负通量,表明土壤以吸收CH4为主,故荒漠草地和胡杨林地均是甲烷的吸收汇。
【Objective】The aim of research is to conduct quantitative analysis of change on the soil CH 4 flux of desert grassland and Populus euphratica forest in Ebinur Lake area and focus on the main environmental factors which are affecting soil CH 4 emissions,and provide data support to explain the environmental factors in the area of desert ecosystem soil CH 4 emissions. 【Method】Using static black- box method combined with Li- 7700 rapid CH 4 analyzer was used to do research into CH 4 emissions of desert grassland and Populus euphratica forest in growth season,and discuss the effects of environmental factors such as the temperature,wind speed,air relative humidity on methane emission. 【Result】During the observation period,the average CH 4 flux of the desert grassland was 2. 19 μg /( m2·s) the maximum value was 48. 96 μg/( m2·s) the minimum value was- 38. 58 μg /( m2·s) the average CH 4 flux of Populus euphratica forest land was- 0. 96 μg /( m2· s) the maximum value was 36. 15 μg /( m2·s) the minimum value was-16. 82 μg/( m2·s) The CH 4 emission of desert grassland had an obvious diurnal variation,presenting a bimodal curve,while Populus euphratica forest did not have an obvious relationship. There was no definite relationship between the CH 4 emissions of desert grassland and Populus euphratica forest and the temperature of different depths of soil layers. The relationship of the CH 4 emission of desert grassland with the temperature of different depth of soil layer was higher than Populus euphratica forest,and was significantly correlated( P < 0. 01),and the correlation of the surface temperature and CH 4 emission flux was not strong; And also air relative humidity and wind speed with daily variation of methane flux were not significant. 【Conclusion】In short,the two soil samples consume the atmospheric methane,so they are CH 4 sink.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2014年第1期81-88,共8页
Xinjiang Agricultural Sciences
基金
国家自然科学基金项目(31060061)
关键词
荒漠草地
胡杨林地
静态暗箱法
土壤甲烷
环境因子
desert grassland
the Euphrates Poplar forests
static camera obscure method
soil methane
environmental factors
