NDLI: Flooding constraints on tree (Taxodium distichum) and herb growth responses to elevated CO$

Content Provider	Springer Nature Link
Author	Megonigal, J. Patrick Vann, Cheryl D. Wolf, Amelia A.
Copyright Year	2005
Abstract	Elevated CO$_{2}$ generally stimulates C$_{3}$-type photosynthesis, but it is unclear how an increase in CO$_{2}$ assimilation will interact with other factors that influence plant growth. In wetlands, the response of plants to elevated CO$_{2}$ will interact with soil saturation, particularly in forested wetlands where soil saturation is a strong regulator of plant productivity. We performed a four-month experiment to determine whether elevated CO$_{2}$ and flooding interact to influence the growth of a flood-tolerant tree (Taxodium distichum) and a flood-tolerant herbaceous emergent macrophyte (Orontium aquaticum). Seedlings were grown in glass-houses at two CO$_{2}$ levels (350 and 700 μL L$^{−1}$) crossed with two water depths (5 cm above and ≥5 cm below the soil surface). We hypothesized that elevated CO$_{2}$ would increase photosynthesis regardless of water depth and species; however, we also expected flooding to prevent elevated CO$_{2}$ from increasing the growth of the tree species due to O$_{2}$ limitation or other physiological stresses associated with reduced soil environments. We found that elevated CO$_{2}$ increased whole-plant photosynthesis in both species regardless of the flooding treatment. ForT. distichum, this higher photosynthetic rate resulted in greater biomass only in the non-flooded treatment. This result suggests that some factor related to flooding constrained the biomass response of the flooded woody plants to elevated CO$_{2}$. In contrast, elevated CO$_{2}$ increasedO. aquaticum biomass regardless of the flooding regime, perhaps because it occurs in wetter landscape positions thanT. distichum and is less sensitive to flooding. We conclude that flooding may limit plant growth responses to elevated CO$_{2}$, particularly in woody plant species.
Starting Page	430
Ending Page	438
Page Count	9
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	25
Issue Number	2
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	2005-01-01
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	elevated CO$_{2}$ emergent aquatic macrophyte photosynthesis wetland Taxodium global change flooding Freshwater & Marine Ecology Environmental Management Ecology Hydrogeology Coastal Sciences Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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