草业学报2018，Vol.27Issue(1)：215-221,7.DOI:10.11686/cyxb2017231
干旱年份沙质草地生态系统净CO2通量年变化特征
Characteristics of annual variation in net carbon dioxide flux in a sandy grassland ecosystem during dry years
摘要
Abstract
Grassland ecosystems are a major component of terrestrial ecosystems in arid and semi-arid regions and play an important role in regional carbon balances.Continuous observation (from 2015 to 2016) of carbon dioxide flux was conducted using the eddy covariance technique in the'Horqin Sandy Land'grassland ecosystem.The study period coincided with the drought in the study area and the annual rainfall during the study was 60％ of the historical average.Key results were:1) The maximum daily absorption rates were-6.68 and -9.58 g · m-2 · d-1,respectively,in 2015 and 2016,while the release rate was 5.69 and 5.21 g · m-2 · d-1.2) The amount of CO2 absorption was-120.54 and-139.83 g · m-2 during growing season and the emission was 230.33 and 212.82 g · m-2 during the non-growing season.3) The Horqin sandy grassland ecosystem was a carbon source when considered from an annual perspective.The net carbon release in 2015 (109.79 g · m-2 · yr 1) was slightly greater than that in 2016 (72.99 g · m-2 · yr-1).4) There were significant correlations between net ecosystem exchange (NEE) and air temperature,soil temperature,and soil moisture.However,the response of NEE to environmental temperature and humidity was not consistent across the two years.关键词
沙质草地/年变化/生态系统净CO2通量/科尔沁沙地Key words
sandy grassland/annual variation/net carbon dioxide flux/Horqin Sandy Land引用本文复制引用
牛亚毅,李玉强,王旭洋,龚相文,罗永清,田德宇..干旱年份沙质草地生态系统净CO2通量年变化特征[J].草业学报,2018,27(1):215-221,7.基金项目
国家重点研发计划(2016YFC0500901),中国科学院百人计划项目(Y551821)和国家自然科学基金项目(31640012,31560161)资助. （2016YFC0500901）
