干旱区生态环境知识资源中心(Arid): 长叶红砂光合特性的研究

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	长叶红砂光合特性的研究
其他题名	Study on Photosynthetic Characteristics of Reaumuria trigyna
	李艳秋; 王同智; 赵一夫
来源期刊	中国草地学报
ISSN	1673-5021
出版年	2015
卷号	37 期号:5 页码:109-113
中文摘要	采用LI-6400光合测定仪,在晴朗天气对长叶红砂成熟叶片的光合有效辐射(PAR)、净光合速率(Pn)、蒸腾速率(Tr)等进行了测定,研究其光合特性。结果表明:长叶红砂Pn日变化呈双峰曲线,主峰出现在12:00,次峰出现在17:00,存在光合"午休"现象,非气孔限制是"午休"主要原因;Pn变幅为5.91~12.45mumolCO_2/m~2·s,Tr变幅为3.75~14.31mmol H_2O/m~2·s;Pn与气孔导度、细胞间CO_2浓度达到极显著相关水平(P<0.01),与Tr达到显著相关水平(P<0.05),与PAR、叶周围气温、大气相对湿度、大气CO_2浓度及大气水汽压亏缺相关性不显著。
英文摘要	Photosynthetic characteristics were studied in mature leaves of Reaumuria trigyna under natural environment using portable LI-6400 photosynthesis instrument(Licor, USA) in July 2014 in East Alashan-West Erdos Desert of China. The diurnal changes of net photosynthetic rate and its major affecting factors, including transpiration rate(Tr), photo-synthetically active radiation(PAR), air temperature(Ta), relative humidity(RH), atmospheric CO_2 concentration(Ca), vapour pressure deficit(VPD), stomatal conductance(Cond), intercellar CO_2 concentration(Ci), were measured. The results showed that the diurnal process of photosynthetic rate exhibited a double peak curve in which the main peak appeared around 11:30, and the second around 17:00. This may reflect an obvious phenomena of midday depression of photosynthesis caused by non-stomatal limitation. Diurnal variation of net photosynthetic rate was 5.91~12.45mumolCO_2/m~2·s, and transpiration rate was 3.75~14.31 mmol H_2O/m~2·s.The main factors affecting diurnal variation of Pn was stomatal conductance and intercellular CO_2 concentration.
中文关键词	长叶红砂 ; 净光合速率 ; 相关关系
英文关键词	Reaumuria trigyna Net photosynthetic rate Correlation
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:5538476
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233656
作者单位	内蒙古煤炭生态环境研究院, 呼和浩特, 内蒙古 010021, 中国
推荐引用方式 GB/T 7714	李艳秋,王同智,赵一夫. 长叶红砂光合特性的研究[J],2015,37(5):109-113.
APA	李艳秋,王同智,&赵一夫.(2015).长叶红砂光合特性的研究.中国草地学报,37(5),109-113.
MLA	李艳秋,et al."长叶红砂光合特性的研究".中国草地学报 37.5(2015):109-113.