干旱区生态环境知识资源中心(Arid): 盐生荒漠CO_2通量对两个极端降水年份响应

Arid

	盐生荒漠CO_2通量对两个极端降水年份响应
其他题名	Responses of CO_2 flux in a saline desert of Northwest China to two contrasting extreme precipitation years
	刘冉; 李彦; 刘燕
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2013
卷号	32 期号:10 页码:2545-2551
中文摘要	以中国科学院新疆阜康荒漠生态站为试验平台,涡度相关技术为主要技术手段,对盐生荒漠生态系统进行长期水汽、CO_2通量观测,探讨年总降水量变化对盐生荒漠生态系统CO_2通量的影响。选取2个极端降水年份2006年(129 mm)和2007年(231 mm)比较CO_2通量的年内变化特征。2006年的碳吸收强度明显低于2007年,其最大碳吸收值分别为-0.4和-1.6 g C·m~(-2)·d~(-1),2006年的生长季长度为120 d,2007年为160 d。2006年表现为弱的碳吸收,其吸收值为-5 g C·m~(-2)·a~(-1),群落总生产力与总呼吸分别为114.9和110.1 g C·m~(-2)·a~(-1),2007年表现为较强的碳吸收,吸收值为-40 g C·m~(-2)·a~(-1),群落总生产力与总呼吸分别为257.7和218.2 g C·m~(-2)·a~(-1)。在干旱年份(2006年),群落总生产力与生态系统蒸散量的线性关系明显弱于湿润年份(2007年),二者的决定系数分别为0.40和0.71。对群落结构进行调查结果表明,在湿润年份,一年生草本植物的比例增加,可以充分利用降水,提高生态系统生产力。
英文摘要	Eddy covariance technique was used to measure carbon flux in a desert halophyte community in Fukang of Xinjiang during two hydrological years (2006 and 2007) with contrasting precipitation. The first hydrological year was dry (2006), with the total annual precipitation of 129 mm and the second was wet (2007), with the total annual precipitation of 231 mm. The main objective of this study was to characterize the seasonal and annual carbon flux of a desert halophyte community using the eddy covariance technique to determine the sensitivity of the system to the varying amounts of precipitation. The results showed that the daily carbon absorption rate of the ecosystem was obviously lower in 2006 than in 2007, with the maximum value being -0.4 g C·m~(-2)·d~(-1) and -1.6 g C·m~(-2)·d~(-1), respectively. The duration of the growth season was 120 days in 2006, and 160 days in 2007. The carbon absorption, gross ecosystem production (GEP), and ecosystem respiration (R_(eco)) were -5 g C·m~(-2)·a~(-1), 114.9 g C·m~(-2)·a~(-1) and 110.1 g C·m~(-2)·a~(-1) in 2006, and -40 g C·m~(-2)·a~(-1), 257.7 g C·m~(-2)·a~(-1) and 218.2 g C·m~(-2)·a~(-1) in 2007, respectively. The linear relationship between the GEP and ecosystem evapotranspiration was obviously weaker in 2006 than in 2007, with the coefficient of determination being 0.40 and 0.71, respectively. The vegetation community survey revealed that the proportion of annual herbaceous plants in 2007 increased, which could fully utilize precipitation to improve the ecosystem productivity.
中文关键词	盐生荒漠植物群落 ; 涡度相关 ; 水汽通量 ; 二氧化碳通量 ; 总生态系统生产力 ; 生态系统呼吸
英文关键词	desert halophyte community eddy covariance water vapor flux CO_2 flux gross ecosystem production ecosystem respiration
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:4953298
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230072
作者单位	中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	刘冉,李彦,刘燕. 盐生荒漠CO_2通量对两个极端降水年份响应[J]. 中国科学院新疆生态与地理研究所,2013,32(10):2545-2551.
APA	刘冉,李彦,&刘燕.(2013).盐生荒漠CO_2通量对两个极端降水年份响应.生态学杂志,32(10),2545-2551.
MLA	刘冉,et al."盐生荒漠CO_2通量对两个极端降水年份响应".生态学杂志 32.10(2013):2545-2551.