干旱区生态环境知识资源中心(Arid): 干旱年份沙质草地生态系统净CO

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	干旱年份沙质草地生态系统净CO_2通量年变化特征
其他题名	Characteristics of annual variation in net carbon dioxide flux in a sandy grassland ecosystem during dry years
	牛亚毅 1; 李玉强 2; 王旭洋 1; 龚相文 1; 罗永清 2; 田德宇 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2018
卷号	27 期号:1 页码:215-221
中文摘要	草地生态系统是干旱半干旱区生态系统类型的重要组成部分,在区域生态系统碳平衡中起着极为重要的作用。采用涡度相关法对科尔沁沙质草地生态系统进行连续两年(2015和2016年)的碳通量观测,此两年恰逢研究区的相对干旱之年,年降水量约为历史平均值的60%。研究结果表明:1)年最大日均CO_2吸收速率分别为-6.68和-9.58g·m~(-2)·d~(-1),年最大日均释放速率分别为5.69和5.21g·m~(-2)·d~(-1)。2)生长季(5-9月)碳吸收量分别为-120.54和-139.83g·m~(-2),非生长季碳释放量分别为230.33和212.82g·m~(-2)。3)全年尺度上沙质草地生态系统表现为碳源,2015年净碳释放量(109.79g·m~(-2)·年~(-1))稍高于2016年(72.99g·m~(-2)·年~(-1))。4)生态系统净CO_2交换量(NEE)与空气温度、土壤温度及土壤湿度存在显著相关关系,但不同年份同期NEE对环境温度和湿度的响应程度不尽一致。
英文摘要	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 2015to 2016)of carbon dioxide flux was conducted using the eddy covariance technique in theHorqin 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-6.68and-9.58g·m~(-2)·d~(-1),respectively,in 2015and 2016,while the release rate was 5.69and 5.21g·m~(-2)·d~(-1). 2)The amount of CO_2absorption was-120.54and-139.83g·m~(-2) during growing season and the emission was 230.33and 212.82g·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(109.79g·m~(-2)· yr~(-1))was slightly greater than that in 2016(72.99g·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.
中文关键词	沙质草地 ; 年变化 ; 生态系统净CO_2通量 ; 科尔沁沙地
英文关键词	sandy grassland annual variation net carbon dioxide flux Horqin Sandy Land
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6158103
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237343
作者单位	1.中国科学院西北生态环境资源研究院;;中国科学院大学, ;;, 兰州;;, 甘肃;;北京 730000;;100049, 中国; 2.中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	牛亚毅,李玉强,王旭洋,等. 干旱年份沙质草地生态系统净CO_2通量年变化特征[J],2018,27(1):215-221.
APA	牛亚毅,李玉强,王旭洋,龚相文,罗永清,&田德宇.(2018).干旱年份沙质草地生态系统净CO_2通量年变化特征.草业学报,27(1),215-221.
MLA	牛亚毅,et al."干旱年份沙质草地生态系统净CO_2通量年变化特征".草业学报 27.1(2018):215-221.