干旱区生态环境知识资源中心(Arid): 科尔沁沙地流动沙丘不同时空尺度水热变化及CO

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	科尔沁沙地流动沙丘不同时空尺度水热变化及CO_2交换特征
其他题名	Characteristics of humidity and temperature variations and CO_2 exchange of mobile dunes at different space-time scales in Horqin sandy land,China
	杨晓君; 刘廷玺; 王冠丽; 段利民; 李东方; 黄天宇
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2020
卷号	31 期号:6 页码:1989-1998
中文摘要	陆面碳循环在气候变化和生态系统碳收支平衡中起到关键作用。水热变化与CO_2交换分析对于深刻揭示荒漠生态系统的区域碳循环规律及机制具有重要意义。本研究选取科尔沁沙地典型流动沙丘为对象,利用涡度相关技术和波文比气象观测系统所测的数据分析近地层水热变化及CO_2交换特征,探讨了日和季节尺度,以及0~10 m垂直空间尺度下流动沙丘近地层温湿度与CO_2交换过程的相互关系。结果表明:研究区近地表气温垂直变幅在0.4~2 ℃,49月,气温随着高度的升高呈减的趋势,其余月份则相反,空气相对湿度季节变幅超过40%;在2018年生长季,沙丘净生态系统碳交换量( NEE)的日均值为-0.02 mg·m~(-2)· s~(-1),全年水平的NEE日均值为0.003 mg·m~(-2)·s~(-1),全年整体上表现为碳源;垂直空间尺度上,垂直温、湿度差与NEE拟合均较好,水热影响拐点分别为10%和0.5 ℃,而全年尺度上温度拟合结果相对较好,水热影响拐点分别为17 ℃和65%。在生长季,研究区近地层垂直温差为负,会抑制流动沙丘对大气CO_2的吸收,而大气高湿环境则会促进流动沙丘对大气CO_2的吸收。不同时间和不同垂直高度上,水热变化与CO_2交换关系较密切,对沙丘碳汇和碳源的产生具有一定的影响,且碳收支对温度的敏感性强于相对湿度。
英文摘要	Terrestrial carbon cycle plays a key role in driving climate change and ecosystem carbon balance. Understanding the variations of humidity and temperature and CO_2 exchanges are meaningful to reveal the law and mechanism of regional carbon cycles in deserts. We examined the near surface humidity,temperature variations,and CO_2 exchanges by eddy covariance and Bowen ratio systems in a typical mobile dune of Horqin sandy land. We analyzed the relationships between waterheat and CO_2 exchanges of 0 to 10 m vertical height at daily and seasonal scales were analyzed. The results showed that the vertical variations of near surface temperature ranged from 0.4 ℃ to 2 ℃ and decreased with the increases of height from April to September,but with an opposite pattern in other months. The seasonal variation of air relative humidity was greater than 40%. During the growing season of 2018,the averaged daily net ecosystem carbon exchange ( NEE) was -0.02 mg·m~(-2)· s~(-1) . The annual averaged daily NEE was 0.003 mg·m~(-2)·s~(-1),indicating that the mobile dunes were carbon sources at the whole year scale. The vertical differences of temperature and humidity well fitted the NEE. The inflexion points of the fitting curve were at 10% humidity and 0.5 ℃ temperature, respectively. At the scalem of the year,the NEE fitting result of temperature was better than that of humidity,with the inflexion points at 17 ℃ and 65% humidity,respectively. In the growing season,the near surface vertical temperature difference was negative,which would inhibit CO_2absorption of mobile dunes. The circumstances of high humidity would promote the absorption of atmospheric CO_2 . Across different time and vertical height,the variations of humidity and temperature were closely related to CO_2 exchanges,which affected carbon sink and source of mobile dunes. Carbon budget was more sensitive to temperature than humidity.
中文关键词	流动沙丘 ; 水热变化 ; 净生态系统碳交换量 ; 涡度相关
英文关键词	mobile dune humidity and temperature variation net ecosystem carbon exchange eddy covariance
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6740371
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336573
作者单位	杨晓君, 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特, 内蒙古 010018, 中国.; 黄天宇, 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特, 内蒙古 010018, 中国.; 刘廷玺, 内蒙古农业大学水利与土木建筑工程学院;;内蒙古自治区水资源保护与利用重点实验室, ;;内蒙古自治区水资源保护与利用重点实验室, 呼和浩特;;呼和浩特, ;; 010018;;010018.; 王冠丽, 内蒙古农业大学水利与土木建筑工程学院;;内蒙古自治区水资源保护与利用重点实验室, ;;内蒙古自治区水资源保护与利用重点实验室, 呼和浩特;;呼和浩特, ;; 010018;;010018.; 段利民, 内蒙古农业大学水利与土木建筑工程学院;;内蒙古自治区水资源保护与利用重点实验室, ;;内蒙古自治区水资源保护与利用重点实验室, 呼和浩特;;呼和浩特, ;; 010018;;010018.; 李东方, 内蒙古农业大学水利与土木建筑工程学院;;内蒙古自治区水资源保护与利用重点实验室, ;;内蒙古自治区水资源保护与利用重点实验室, 呼和浩特;;呼和浩特, ;; 010018;;010018.
推荐引用方式 GB/T 7714	杨晓君,刘廷玺,王冠丽,等. 科尔沁沙地流动沙丘不同时空尺度水热变化及CO_2交换特征[J]. 内蒙古农业大学,2020,31(6):1989-1998.
APA	杨晓君,刘廷玺,王冠丽,段利民,李东方,&黄天宇.(2020).科尔沁沙地流动沙丘不同时空尺度水热变化及CO_2交换特征.应用生态学报,31(6),1989-1998.
MLA	杨晓君,et al."科尔沁沙地流动沙丘不同时空尺度水热变化及CO_2交换特征".应用生态学报 31.6(2020):1989-1998.