Photosynthesis 131 



FIGURE 4-17. Annual net photosynthesis for 

 Calliergon sarmentosum and Dicranum 

 angustum at different substrate water poten- 

 tials for three simulated seasons and condi- 

 tions ("cold, " standard, "hot") for moss in 

 full sun ( — ) and under the canopy ( — / (After 

 Stoner et al. 1978b.) 



thesis in the hot climate as compared with the standard climate (Figure 

 4-17). 



Canopy Architecture Effects 



Previous simulations and field data have shown the importance of 

 physiological parameters and the dependence of photosynthesis on cer- 

 tain environmental variables. Since these variables are influenced by 

 structural features of the plants as well as by physical features of the can- 

 opy, their potential influence on photosynthesis needs to be understood. 



