Abstract:The development and physiological consequences of ozone‐induced visible injury was investigated in native populations of Jeffrey pine (Pinus jeffreyi) that were exposed to chronic levels of anthropogenic ozone. Stand structure analyses demonstrated that the expression of visible ozone injury symptoms within self‐regenerating populations of Jeffrey pine was highly variable. Of the 975 trees surveyed, 90% exhibited some degree of visible injury and 10% were classified as resistant to ozone. Needles of the most s… Show more
“…In some cases it appears that N remobilization from foliage into the plant is not complete at the time of foliage abscission in O 3 ‐exposed plants (Findlay & Jones, 1990; Stow et al ., 1992; Matyssek et al ., 1993; Patterson & Rundel, 1995). Greater N content of senesced litter could increase rates of decomposition.…”
Contents
Summary 213
Introduction 213
Source–sink model: carbohydrate signaling 214
Effect of ozone on above‐ground sources and sinks 216
Decreased allocation below ground 218
Carbon flux to soils 220
Soil food web 223
Summary, conclusions and future research 223
Acknowledgements 223
References 223
Summary
The role of tropospheric ozone in altering plant growth and development has been the subject of thousands of publications over the last several decades. Still, there is limited understanding regarding the possible effects of ozone on soil processes. In this review, the effects of ozone are discussed using the flow of carbon from the atmosphere, through the plant to soils, and back to the atmosphere as a framework. A conceptual model based on carbohydrate signaling is used to illustrate physiological changes in response to ozone, and to discuss possible feedbacks that may occur. Despite past emphasis on above‐ground effects, ozone has the potential to alter below‐ground processes and hence ecosystem characteristics in ways that are not currently being considered.
“…In some cases it appears that N remobilization from foliage into the plant is not complete at the time of foliage abscission in O 3 ‐exposed plants (Findlay & Jones, 1990; Stow et al ., 1992; Matyssek et al ., 1993; Patterson & Rundel, 1995). Greater N content of senesced litter could increase rates of decomposition.…”
Contents
Summary 213
Introduction 213
Source–sink model: carbohydrate signaling 214
Effect of ozone on above‐ground sources and sinks 216
Decreased allocation below ground 218
Carbon flux to soils 220
Soil food web 223
Summary, conclusions and future research 223
Acknowledgements 223
References 223
Summary
The role of tropospheric ozone in altering plant growth and development has been the subject of thousands of publications over the last several decades. Still, there is limited understanding regarding the possible effects of ozone on soil processes. In this review, the effects of ozone are discussed using the flow of carbon from the atmosphere, through the plant to soils, and back to the atmosphere as a framework. A conceptual model based on carbohydrate signaling is used to illustrate physiological changes in response to ozone, and to discuss possible feedbacks that may occur. Despite past emphasis on above‐ground effects, ozone has the potential to alter below‐ground processes and hence ecosystem characteristics in ways that are not currently being considered.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.