Ecophysiological acclimation to different soil moistures in plants from a semi-arid sandland

被引:25
作者
Niu, SL [1 ]
Jiang, GM [1 ]
Wan, SQ [1 ]
Liu, MZ [1 ]
Gao, LM [1 ]
Li, YG [1 ]
机构
[1] Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China
关键词
chlorophyll fluorescence; leaf water potential; photosynthetic rate; root depth; stomatal conductance;
D O I
10.1016/j.jaridenv.2005.03.017
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In order to explore the functional significance of ecophysiological heterogeneity among three and microhabitats (sand dune, lowland and wetland), we investigated the stomatal and photosynthetic acclimation to soil moistures in different plants of highly diversified Hunshandak Sandland, Inner Mongolia, China. Wetland was found to have the highest soil water potential (0-40cm), while the fixed sand dune had the lowest (P < 0.001). The three microhabitats appeared in a similar pattern in leaf water potential (Psi(leaf)), stomatal conductance (g(s)), photosynthetic rate (P-n) and photochemical efficiency of photosystem II(F-v/F-m) with that of soil water potential, i.e. wetland > lowland > fixed sand dune (p < 0.01). Inversely, however, root depths in both fixed sand dune and lowland was 58% deeper (p < 0.05) than wetland. Photosynthetic characteristics (e.g. g(s), P-n, and F-v/F-m) were found to be linearly correlated with Psi(leaf) in fixed sand dune and lowland (p < 0.05), but no linear relation among these traits were noted in wetland. Such a result indicated that water played an important role in controlling the ecophysiological process. Stomata sensitivity to leaf water potential changes increased with drought. In the microhabitats with contrasting soil water availabilities, plants may display feedback responses to the and environment through elongating their root lengths and/or reducing their stomatal conductance. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:353 / 365
页数:13
相关论文
共 36 条
[1]   Ecophysiological responses of three evergreen woody Mediterranean species to water stress [J].
Abril, M ;
Hanano, R .
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY, 1998, 19 (04) :377-387
[2]  
[Anonymous], COMPONENTS PRODUCTIV
[3]  
Bai YF., 2000, ACTA PHYTOECOLOGICA, V24, P667, DOI DOI 10.3321/J.ISSN:1005-264X.2000.06.005
[4]  
BAOIN T, 1994, SOIL INNER MONGOLIA
[5]  
Batanouny K.H., 2001, PLANTS DESERTS MIDDL, P145
[6]   Control of stomatal conductance by leaf water potential in Hymenoclea salsola (T&G), a desert subshrub [J].
Comstock, J ;
Mencuccini, M .
PLANT CELL AND ENVIRONMENT, 1998, 21 (10) :1029-1038
[7]   Drought stress inhibits photosynthesis by decreasing stomatal aperture - not by affecting ATP synthesis [J].
Cornic, G .
TRENDS IN PLANT SCIENCE, 2000, 5 (05) :187-188
[8]  
Cui XiaoYong, 2001, Acta Prataculturae Sinica, V10, P14
[9]   AVAILABILITY OF SOIL WATER TO PLANTS AS AFFECTED BY SOIL MOISTURE CONTENT AND METEOROLOGICAL CONDITIONS [J].
DENMEAD, OT ;
SHAW, RH .
AGRONOMY JOURNAL, 1962, 54 (05) :385-&
[10]   COMPETITIVE ABILITY IS LINKED TO RATES OF WATER EXTRACTION - A FIELD-STUDY OF 2 ARIDLAND TUSSOCK GRASSES [J].
EISSENSTAT, DM ;
CALDWELL, MM .
OECOLOGIA, 1988, 75 (01) :1-7