干旱区生态环境知识资源中心(Arid): 额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征

Arid

	额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征
其他题名	Leaf Water Potential of Populus euphratica in the Ejin Oasis
	李小琴; 张小由; 刘晓晴; 高冠龙
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2014
卷号	34 期号:3 页码:712-717
中文摘要	利用WP4露点水势仪对额济纳绿洲胡杨(Popupulus euphratica)叶水势进行测定,研究了胡杨叶水势的日和月变化规律及其影响因子。结果表明:(1)胡杨叶水势日进程呈V形,最小值大都出现在13:00,日均值为-2. 530.30 MPa;月变化呈先上升后下降趋势,月均值为-2. 430.30 MPa。(2)树龄越小对应的叶水势越高;叶片着生部位越高,对应的水势越低;卵圆形叶水势整体稍高于披针形叶水势。(3)叶水势与气温、饱和水汽压差和蒸腾速率呈极显著线性负相关,相关系数依次为-0. 87、-0. 69和-0. 88;与相对湿度和光合速率呈极显著二次多项式相关,相关系数分别为0. 85和0.92。胡杨叶水势各方面的综合研究对于明晰胡杨的水分亏缺和抗旱机理有一定的理论指导意义。
英文摘要	Based on the data observed by WP4 Dewpoint Potential Meter at the Ejin Oasis, we mainly analyzed the daily and monthly variations in leaf water potential of Populus euphratica, and its relationship with impact factors. Results showed that it was a V-curve of the daily variation in leaf water potential of P. euphratica. The daily average value was 2. 59 0. 30 MPa and the minimums appear at 13:00 mostly. The monthly variation increased firstly and then decreased. The monthly average value was 2.440. 30 MPa. As far as morphological difference was connected, trees with younger ages had higher leaf water potential. Leaves on the upper branches had lower water potential and vice versa. Water potentials of the oval leaves exceeded the lanceolate leaves as a whole. As far as environmental and plant physiological factors were connected, correlation analysis showed that there were highly significant negative linear correlations between leaf water potential and air temperature, vapor pressure deficit and transpiration rate. The correlation coefficients were 0.87, 0. 69 and 0.88, respectively. Highly significant quadratic polynomial correlations were between leaf water potential and relative humidity and photosynthetic rate. The correlation coefficients were 0.85 and 0. 92 in sequence. The study may provide theory guidance for better understanding of water stress and drought-resistance mechanism to of P. euphratica to some extent.
中文关键词	叶水势 ; 蒸腾 ; 胡杨(Populus euphratica) ; 额济纳绿洲
英文关键词	leaf water potential transpiration Populus euphratica Ejin Oasis
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:5153906
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232181
作者单位	中国科学院寒区旱区环境与工程研究所阿拉善荒漠生态水文试验研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	李小琴,张小由,刘晓晴,等. 额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征[J]. 中国科学院西北生态环境资源研究院,2014,34(3):712-717.
APA	李小琴,张小由,刘晓晴,&高冠龙.(2014).额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征.中国沙漠,34(3),712-717.
MLA	李小琴,et al."额济纳绿洲河岸胡杨(Populus euphratica)叶水势变化特征".中国沙漠 34.3(2014):712-717.