干旱区生态环境知识资源中心(Arid): 半干旱区典型沙生植物油蒿(Artemisia ordosica)的光合特性

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	半干旱区典型沙生植物油蒿(Artemisia ordosica)的光合特性
其他题名	Photosynthetic characteristics of typical desert plant Artemisia ordosica in semi-arid region
	李媛; 查天山; 贾昕; 秦树高; 吴雅娟; 王奔
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2015
卷号	34 期号:1 页码:86-93
中文摘要	为了研究西北半干旱生态系统中典型沙生植物油蒿(Artemisia ordosica)的光合特征,于2012年510月,使用 Li-6400(Li-Cor Inc.,USA)便携式光合测定系统,测定了油蒿气体交换特征的日变化、季节变化以及净光合速率(P_n)对光合有效辐射和胞间 CO_2浓度的响应。结果表明:P_n、蒸腾速率(E)和水分利用效率(WUE)的日变化在12:00前后均表现出非对称性,上午测量值普遍高于下午;P_n日均值6月最高(8.971.73 mumol CO_2 ?m~(-2)?s~(-1)),10月最低(2.581.32 mumol CO_2 ?m~(-2) ?s~(-1));油蒿表观量子效率(alpha)在0. 022 ~ 0.048 mol?mol~(-1)变化,羧化效率(phi)在0.125 ~ 0. 268 mol?m~(-2)?s~(-1)变化;在9月13日饱和光强下的 P_n(P_(nmax))达到生长季最大值,为24.89 mumol CO_2 ?m~(-2)?s~(-1);在7月31日饱和胞间 CO_2浓度下的 P_n(A_(nmax)),达到生长季最大值,为77. 23 mumol CO_2?m~(-2)?s~(-1);P_(nmax)主要受到相对湿度影响,A_(nmax)主要受饱和水汽压亏缺和30 cm深度土壤体积含水率影响;水分相关环境因子是油蒿光合作用的主要限制因子,其光合特征反映出对半干旱气候的适应性。本研究结果可为生态系统过程建模和区域尺度研究提供重要的生理生态参数。
英文摘要	Using a portable photosynthesis system,we measured the leaf gas exchange characteristics of Artemisia ordosica,a dominant shrub species in semi-arid areas of Northwest China,from May to October 2012 to quantify the temporal variations and environmental controls of its photo-synthetic characteristics. Results showed that the diurnal variations of net photosynthesis rate(P_n),transpiration rate(E) and water use efficiency(WUE) were all asymmetric around 12:00,being higher in the morning than in the afternoon. Daily mean P_n varied over the growing season,being highest in June [(8. 97 1. 73) mumol CO_2?m~(-2)?s~(-1)]and lowest in October [(2. 58 1. 32) mumol CO_2?m~(-2)?s~(-1)]. The apparent quantum yield(alpha) and the carboxylation efficiency(phi) of A. ordosica varied in the range 0. 022-0. 048 mol?mol~(-1) and 0. 125-0.268 mol?m~(-2)?s~(-1),respectively. The maximum net photosynthetic rate at the optimum light intensity(P_(nmax)) and saturation intercellular CO_2 concentration(A_(nmax)) occurred on 13 September(24. 89 mumol CO_2 ?m~(-2)?s~(-1)) and 31 July(77. 23 mumol CO_2 ?m~(-2) ?s~(-1)),respectively.The P_(nmax) was significantly correlated with the atmospheric relative humidity,and A_(nmax) was significantly correlated with vapor pressure deficit and soil volumetric water content at 30 cm depth. Our results indicated that the carbon assimilation of A. ordosica was primarily limited by moisture related factors,and the photosynthetic characteristics of A. ordosica reflected its adaptation to semi-arid conditions with low water availability and high summer temperature. In addition,our study provides important eco-physiological parameters that may help develop process-based ecosystem carbon-cycle models.
中文关键词	油蒿 ; 光合 ; 日变化 ; 季节变化 ; 响应曲线
英文关键词	Artemisia ordosica photosynthesis diurnal variation seasonal variation response curve
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:5335181
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233221
作者单位	北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	李媛,查天山,贾昕,等. 半干旱区典型沙生植物油蒿(Artemisia ordosica)的光合特性[J]. 北京林业大学,2015,34(1):86-93.
APA	李媛,查天山,贾昕,秦树高,吴雅娟,&王奔.(2015).半干旱区典型沙生植物油蒿(Artemisia ordosica)的光合特性.生态学杂志,34(1),86-93.
MLA	李媛,et al."半干旱区典型沙生植物油蒿(Artemisia ordosica)的光合特性".生态学杂志 34.1(2015):86-93.