干旱区生态环境知识资源中心(Arid): 水分胁迫对金露梅叶片水势、光合特性和水分利用效率的影响

Arid

	水分胁迫对金露梅叶片水势、光合特性和水分利用效率的影响
其他题名	Impact of water stress on leaf water potential, photosynthetic parameters and water use efficiency of Potentilla fruticosa
	刘颖; 贺康宁; 徐特; 王辉; 刘玉娟
来源期刊	中国水土保持科学
ISSN	1672-3007
出版年	2016
卷号	14 期号:1 页码:106-113
中文摘要	为解决青海高寒区绿化植物的栽培驯化问题,并为金露梅栽植的科学管理及高寒区水资源有效利用提供理论基础,以2年生金露梅幼苗为研究对象,通过盆栽方法人为控制土壤水分条件,测定不同土壤水分条件下金露梅苗木的光合生理特征,研究金露梅光合生理特性及其与土壤水分的相互关系。结果显示:1)金露梅凋萎系数为4.02%左右;2)土壤水分对金露梅叶水势及光合作用的影响具有阈值现象,净光合速率最大时土壤含水量为20.83%,水合补偿点为4.38%,水分利用效率最大时土壤含水量为13.82%;3)在砂壤土条件下,金露梅生长最适宜的土壤水分环境为8.33%~12.71%,此范围内既可以维持植物基本的生长所需,又可以最大程度提高水分利用效率;4)青海地区在金露梅盛花期(7月),在无降雨的情况下,每2~3周补充一次水分能维持金露梅较好生长。2~3周的持续干旱所造成的伤害在灌水后可逐渐恢复,但连续1个月无任何供水会使金露梅死亡。
英文摘要	[Background] The rapid development of urbanization have put forward higher requirements on the country road greening and landscape. But the high latitudes, low temperature and drought problem restrain the growth and breeding of many kinds of flowers in the cold and arid Qinghai Province. So a number of scholars began to study the advantages of the local wild species, trying to pick out plant species domesticated from local flowers for landscaping and road greening. [Methods] In order to solve the problem of the cultivation and domestication of greening plants in the cold and arid Qaidam regions, Qinghai Province, explore the photosynthetic physiological characteristics of Potentilla fruticosa and its quantitative relations with soil moistures, provide a scientific basis to the scientific irrigation management of P. fruticosa, and improve the water use efficiency of alpine and arid regions in addition, 17 P. fruticosa seedlings (2 years old) were taken as the research object under a pot experiment to study its rules of response to drought stress and rewatering. Leaf water potential, photosynthetic parameters and photosynthetic diurnal variation process were investigated. Quantitative relations between net photosynthetic rate, transpiration rate, water use efficiency and soil water content were explored to determine the suitable soil moisture thresholds of photosynthesis and water use efficiency of P. fruticosa. [Results & Conclusions] The main results are as follows: 1) With the lowering of soil moisture to 5.97%, more than half of the leaves dried up, and the wilting moisture content of P. fruticosa was about 4.02%. 2)The effects of soil moisture content on leaf water potential and photosynthetic parameters had threshold, too high and too low soil moisture content would inhibit the physiological activity of P. fruticosa. The morning leaf water potential, net photosynthetic rate, and transpiration rate of P. fruticosa had obvious threshold response to the changes of soil moisture. The morning leaf water potential would decrease if the soil moisture was lower than 19.48%, and when the soil moisture varied from 17.03% to 14.37%, the morning leaf water potential would come down at the maximum speed and amplitude, indicating that this range of soil moisture content would significantly improve the water absorption and drought resistance of P. fruticosa. When the net photosynthetic rate reached its maximum the soil moisture content was 20.83%, the soil moisture content of highest water use efficiency was 13.82%, and the hydration compensation point was 4.38%. 3)Under the condition of sandy loam, the net photosynthetic rate could keep above 70% of its maximum unless the soil moisture went down to 12.71%. When the soil moisture content was about 8.33% the water use efficiency could keep 70% of its maximum, and the change speed of water use efficiency would slow down. So soil water content varing from 8.33% to 12.71% could not only satisfy the basic need for the growth of P. fruticosa, but also improve the efficiency of water use to the largest extent. 4) During the growing season of P. fruticosa in Qinghai Province (July) without any rain, the irrigation should be conducted once every two weeks for good growth. P. fruticosa is able to recover from 2-3 weeks’ drought after irrigation, but will die of the drought stress which lasts over one month.
中文关键词	水分胁迫 ; 叶片水势 ; 光合作用 ; 水分利用效率 ; 土壤含水量
英文关键词	water stress leaf water potential photosynthesis water use efficiency soil moisture content
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:5648885
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/2XILL650/235494
作者单位	北京林业大学, 水土保持与荒漠化防治教育部重点试验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	刘颖,贺康宁,徐特,等. 水分胁迫对金露梅叶片水势、光合特性和水分利用效率的影响[J]. 北京林业大学,2016,14(1):106-113.
APA	刘颖,贺康宁,徐特,王辉,&刘玉娟.(2016).水分胁迫对金露梅叶片水势、光合特性和水分利用效率的影响.中国水土保持科学,14(1),106-113.
MLA	刘颖,et al."水分胁迫对金露梅叶片水势、光合特性和水分利用效率的影响".中国水土保持科学 14.1(2016):106-113.