SCALING CO2-PHOTOSYNTHESIS RELATIONSHIPS FROM THE LEAF TO THE CANOPY

被引:186
作者
AMTHOR, JS [1 ]
机构
[1] WOODS HOLE RES CTR, WOODS HOLE, MA 02543 USA
关键词
BIG LEAF; CONDUCTANCE; FOREST; MODEL; WHEAT;
D O I
10.1007/BF00014590
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Responses of individual leaves to short-term changes in CO2 partial pressure have been relatively well studied. Whole-plant and plant community responses to elevated CO2 are less well understood and scaling up from leaves to canopies will be complicated if feedbacks at the small scale differ from feedbacks at the large scale. Mathematical models of leaf, canopy, and ecosystem processes are important tools in the study of effects on plants and ecosystems of global environmental change, and in particular increasing atmospheric CO2, and might be used to scale from leaves to canopies. Models are also important in assessing effects of the biosphere on the atmosphere. Presently, multilayer and big leaf models of canopy photosynthesis and energy exchange exist. Big leaf models - which are advocated here as being applicable to the evaluation of impacts of 'global change' on the biosphere - simplify much of the underlying leaf-level physics, physiology, and biochemistry, yet can retain the important features of plant-environment interactions with respect to leaf CO2 exchange processes and are able to make useful, quantitative predictions of canopy and community responses to environmental change. The basis of some big leaf models of photosynthesis, including a new model described herein, is that photosynthetic capacity and activity are scaled vertically within a canopy (by plants themselves) to match approximately the vertical profile of PPFD. The new big leaf model combines physically based models of leaf and canopy level transport processes with a biochemically based model of CO2 assimilation. Predictions made by the model are consistent with canopy CO2 exchange measurements, although a need exists for further testing of this and other canopy physiology models with independent measurements of canopy mass and energy exchange at the time scale of 1 h or less.
引用
收藏
页码:321 / 350
页数:30
相关论文
共 117 条
[1]   PLANT AND SOIL RESPONSES TO CHRONIC NITROGEN ADDITIONS AT THE HARVARD FOREST, MASSACHUSETTS [J].
ABER, JD ;
MAGILL, A ;
BOONE, R ;
MELILLO, JM ;
STEUDLER, P ;
BOWDEN, R .
ECOLOGICAL APPLICATIONS, 1993, 3 (01) :156-166
[2]   STATE-OF-THE-ART OF MODELS OF PRODUCTION DECOMPOSITION LINKAGES IN CONIFER AND GRASSLAND ECOSYSTEMS [J].
AGREN, GI ;
MCMURTRIE, RE ;
PARTON, WJ ;
PASTOR, J ;
SHUGART, HH .
ECOLOGICAL APPLICATIONS, 1991, 1 (02) :118-138
[3]  
Amthor Jeffrey S., 1994, P501
[4]   RESPIRATION IN A FUTURE, HIGHER-CO2 WORLD [J].
AMTHOR, JS .
PLANT CELL AND ENVIRONMENT, 1991, 14 (01) :13-20
[5]   CO2 INHIBITS RESPIRATION IN LEAVES OF RUMEX-CRISPUS L [J].
AMTHOR, JS ;
KOCH, GW ;
BLOOM, AJ .
PLANT PHYSIOLOGY, 1992, 98 (02) :757-760
[6]  
AMTHOR JS, 1993, ECOPHYSIOLOGY PHOTOS, P71
[7]  
AMTHOR JS, 1994, PHYSL DETERMINATION
[8]  
[Anonymous], 1989, PHOTOSYNTHESIS
[9]   SEPARATION OF DIRECT AND INDIRECT RESPONSES OF STOMATA TO LIGHT - RESULTS FROM A LEAF INVERSION EXPERIMENT AT CONSTANT INTERCELLULAR CO2 MOLAR FRACTION [J].
APHALO, PJ ;
JARVIS, PG .
JOURNAL OF EXPERIMENTAL BOTANY, 1993, 44 (261) :791-800
[10]   EFFECTS OF SOURCE-SINK RELATIONS ON PHOTOSYNTHETIC ACCLIMATION TO ELEVATED CO2 [J].
ARP, WJ .
PLANT CELL AND ENVIRONMENT, 1991, 14 (08) :869-875