Ehleringer 13 C content of ecosystem respiration is linked to precipitation and vapor pressure deficit

Variation in the carbon isotopic composition of ecosystem respiration (δ 13 C R) was studied for 3 years along a precipitation gradient in western Oregon, USA, using the Keeling plot approach. Study sites included six coniferous forests, dominated by Picea sitchensis, Tsuga heterophylla, Pseudotsuga menziesii, Pinus ponderosa, and Juniperus occidentalis, and ranged in location from the Pacific coast to the eastern side of the Cascade Mountains (a 250-km transect). Mean annual precipitation across these sites ranged from 227 to 2,760 mm. Overall δ 13 C R varied from –23.1 to –33.1‰, and within a single forest, it varied in magnitude by 3.5–8.5‰. Mean annual δ 13 C R differed significantly in the forests and was strongly correlated with mean annual precipitation. The carbon isotope ratio of carbon stocks (leaves, fine roots, litter, and soil organic matter) varied similarly with mean precipitation (more positive at the drier sites). There was a strong link between δ 13 C R and the vapor saturation deficit of air (vpd) 5–10 days earlier, both across and within sites. This relationship is consistent with stomatal regulation of gas exchange and associated changes in photosynthetic carbon isotope discrimination. Recent freeze events caused significant deviation from the δ 13 C R versus vpd relationship, resulting in higher than expected δ 13 C R values.

[1]  H. Griffiths.  Stable Isotopes , 2020 .

[2]  P. Högberg,et al.  Natural abundance of 13C in CO2 respired from forest soils reveals speed of link between tree photosynthesis and root respiration , 2001, Oecologia.

[3]  N. Buchmann,et al.  Rooting depth, water availability, and vegetation cover along an aridity gradient in Patagonia , 1996, Oecologia.

[4]  H. Ziegler,et al.  Diversity, metabolic types and δ13C carbon isotope ratios in the grass flora of Namibia in relation to growth form, precipitation and habitat conditions , 1996, Oecologia.

[5]  G. Farquhar,et al.  13C discrimination during CO2 assimilation by the terrestrial biosphere , 1994, Oecologia.

[6]  G. Carter,et al.  Autumn stomatal closure in six conifer species of the Central Rocky Mountains , 1984, Oecologia.

[7]  J. Ehleringer,et al.  Comparative water use and nitrogen relationships in a mistletoe and its host , 2004, Oecologia.

[8]  H. Krouse,et al.  Shifts in carbon isotope ratios of two C3 halophytes under natural and artificial conditions , 2004, Oecologia.

[9]  B. Law,et al.  Carbon storage and fluxes in ponderosa pine forests at different developmental stages , 2001 .

[10]  J. Ehleringer,et al.  Technique to measure CO2 mixing ratio in small flasks with a bellows/IRGA system , 2001 .

[11]  N. Buchmann,et al.  Large-scale forest girdling shows that current photosynthesis drives soil respiration , 2001, Nature.

[12]  R. Monson,et al.  Partitioning net ecosystem carbon exchange with isotopic fluxes of CO2 , 2001 .

[13]  Michael G. Ryan,et al.  Stomatal conductance and photosynthesis vary linearly with plant hydraulic conductance in ponderosa pine , 2001 .

[14]  K. Pregitzer,et al.  Combined effects of atmospheric CO2 and N availability on the belowground carbon and nitrogen dynamics of aspen mesocosms , 2000, Oecologia.

[15]  Dennis D. Baldocchi,et al.  Measuring and modelling seasonal variation of carbon dioxide and water vapour exchange of a Pinus ponderosa forest subject to soil water deficit , 2000 .

[16]  Stan D. Wullschleger,et al.  Hydraulic limitation of tree height: a critique , 2000 .

[17]  J. E. Stone,et al.  Differences in leaf gas exchange and water relations among species and tree sizes in an Arizona pine-oak forest. , 2000, Tree physiology.

[18]  D. Ellsworth,et al.  Influence of soil porosity on water use in Pinus taeda , 2000, Oecologia.

[19]  W. Schlesinger,et al.  Separation of root respiration from total soil respiration using carbon-13 labeling during Free-Air Carbon dioxide Enrichment (FACE) , 1999 .

[20]  A. Fitter,et al.  Root production and turnover in an upland grassland subjected to artificial soil warming respond to radiation flux and nutrients, not temperature , 1999, Oecologia.

[21]  B. Bond,et al.  Stomatal behavior of four woody species in relation to leaf-specific hydraulic conductance and threshold water potential. , 1999, Tree physiology.

[22]  B. Law,et al.  Carbon and water vapor exchange of an open-canopied ponderosa pine ecosystem , 1999 .

[23]  D. Baldocchi,et al.  Below-canopy and soil CO2 fluxes in a ponderosa pine forest , 1999 .

[24]  J. Ehleringer,et al.  Spatial and temporal variation in the carbon and oxygen stable isotope ratio of respired CO2 in a boreal forest ecosystem , 1999 .

[25]  M. G. Ryan,et al.  Evidence that hydraulic conductance limits photosynthesis in old Pinus ponderosa trees. , 1999, Tree physiology.

[26]  Michael G. Ryan,et al.  Seasonal and annual respiration of a ponderosa pine ecosystem , 1999 .

[27]  J. Pate,et al.  δ13C analysis of phloem sap carbon: novel means of evaluating seasonal water stress and interpreting carbon isotope signatures of foliage and trunk wood of Eucalyptus globulus , 1998, Oecologia.

[28]  J. Ehleringer,et al.  Carbon and oxygen isotope ratios of ecosystem respiration along an Oregon conifer transect: preliminary observations based on small-flask sampling. , 1998, Tree physiology.

[29]  A. Fitter,et al.  Root production, turnover and respiration under two grassland types along an altitudinal gradient: influence of temperature and solar radiation , 1998, Oecologia.

[30]  George H. Taylor,et al.  The Prism Approach to Mapping Precipitation and Temperature , 1998 .

[31]  J. Ehleringer,et al.  Carbon isotope discrimination of terrestrial ecosystems , 1998 .

[32]  Richard J. Williams,et al.  Carbon and nitrogen isotope discrimination and nitrogen nutrition of trees along a rainfall gradient in northern Australia , 1998 .

[33]  J. Randerson,et al.  Carbon 13 exchanges between the atmosphere and biosphere , 1997 .

[34]  M. G. Ryan,et al.  Hydraulic Limits to Tree Height and Tree Growth , 1997 .

[35]  J. Ehleringer,et al.  Interseasonal comparison of CO2 concentrations, isotopic composition, and carbon dynamics in an Amazonian rainforest (French Guiana) , 1997, Oecologia.

[36]  J. Ehleringer,et al.  Influence of stand structure on carbon-13 of vegetation, soils, and canopy air within deciduous and evergreen forests in Utah, United States , 1997, Oecologia.

[37]  J. Ehleringer,et al.  Vertical gradients in photosynthetic gas exchange characteristics and refixation of respired CO(2) within boreal forest canopies. , 1997, Tree physiology.

[38]  J. Ehleringer,et al.  Carbon isotope discrimination during photosynthesis and the isotope ratio of respired CO2 in boreal forest ecosystems , 1996 .

[39]  S. Gower,et al.  Aboveground net primary production decline with stand age: potential causes. , 1996, Trends in ecology & evolution.

[40]  J. Panek,et al.  Correlations between stable carbon-isotope abundance and hydraulic conductivity in Douglas-fir across a climate gradient in Oregon, USA. , 1996, Tree physiology.

[41]  J. Ehleringer.  Variation in Gas Exchange Characteristics Among Desert Plants , 1995 .

[42]  Peter D. Erskine,et al.  13C Natural Abundance in Plant Communities Along a Rainfall Gradient: a Biological Integrator of Water Availability , 1995 .

[43]  J. Ehleringer,et al.  Atmospheric CO(2) and the ratio of intercellular to ambient CO(2) concentrations in plants. , 1995, Tree physiology.

[44]  Richard H. Waring,et al.  Combining Remote Sensing and Climatic Data to Estimate Net Primary Production Across Oregon , 1994 .

[45]  J. Marshall,et al.  Carbon Isotope Discrimination and Water-Use Efficiency in Native Plants of the North-Central Rockies , 1994 .

[46]  W. Horwath,et al.  14C Allocation in tree-soil systems. , 1994, Tree physiology.

[47]  Richard H. Waring,et al.  Evidence of Reduced Photosynthetic Rates in Old Trees , 1994, Forest Science.

[48]  Richard H. Waring,et al.  Environmental Limits on Net Primary Production and Light‐Use Efficiency Across the Oregon Transect , 1994 .

[49]  Richard H. Waring,et al.  Overview of the Oregon Transect Ecosystem Research Project , 1994 .

[50]  C. Daly,et al.  A Statistical-Topographic Model for Mapping Climatological Precipitation over Mountainous Terrain , 1994 .

[51]  Pieter P. Tans,et al.  Oceanic 13C/12C observations: A new window on ocean CO2 uptake , 1993 .

[52]  Richard H. Waring,et al.  Maintenance Respiration and Stand Development in a Subalpine Lodgepole Pine Forest , 1992 .

[53]  J. Ehleringer,et al.  Correlating genetic variation in carbon isotopic composition with complex climatic gradients. , 1992, Proceedings of the National Academy of Sciences of the United States of America.

[54]  L. E. Eddleman,et al.  The seasonal course of physiological processes in Juniperus occidentalis , 1992 .

[55]  S. Madhavan,et al.  Effects of Relative Humidity on Carbon Isotope Fractionation in Plants , 1991 .

[56]  M. Harmon,et al.  Changes in biomass and production over 53 years in a coastal Piceasitchensis –Tsugaheterophylla forest approaching maturity , 1990 .

[57]  J. Ehleringer,et al.  Carbon Isotope Discrimination and Photosynthesis , 1989 .

[58]  G. Farquhar,et al.  Correlation between the Carbon Isotope Discrimination in Leaf Starch and Sugars of C(3) Plants and the Ratio of Intercellular and Atmospheric Partial Pressures of Carbon Dioxide. , 1988, Plant physiology.

[59]  J. Sperry,et al.  Do woody plants operate near the point of catastrophic xylem dysfunction caused by dynamic water stress? : answers from a model. , 1988, Plant physiology.

[60]  P. Grieu,et al.  The effects of soil and atmospheric drought on photosynthesis and stomatal control of gas exchange in three coniferous species , 1988 .

[61]  P. Jarvis,et al.  Stomatal responses to humidity in selected conifers. , 1986, Tree physiology.

[62]  Henry L. Gholz,et al.  Environmental Limits on Aboveground Net Primary Production, Leaf Area, and Biomass in Vegetation Zones of the Pacific Northwest , 1982 .

[63]  T. Sharkey,et al.  Stomatal conductance and photosynthesis , 1982 .

[64]  Graham D. Farquhar,et al.  On the Relationship Between Carbon Isotope Discrimination and the Intercellular Carbon Dioxide Concentration in Leaves , 1982 .

[65]  R. Waring,et al.  Evergreen Coniferous Forests of the Pacific Northwest , 1979, Science.

[66]  Charles D. Keeling,et al.  The concentration and isotopic abundances of atmospheric carbon dioxide in rural areas , 1958 .