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Title: Partitioning CO 2 fluxes with isotopologue measurements and modeling to understand mechanisms of forest carbon sequestration

Abstract

This project combines automated in situ observations of the isotopologues of CO 2 with root observations, novel experimental manipulations of below ground processes, and isotope-enabled ecosystem modeling to investigate mechanisms of below- vs. above ground carbon sequestration at the Harvard Forest Environmental Measurements Site (EMS). The proposed objectives, which have now been largely accomplished, include: (A) Partitioning of net ecosystem CO2 exchange (NEE) into photosynthesis and respiration using long-term continuous observations of the isotopic composition of NEE, and analysis of their dynamics; (B) Investigation of the influence of vegetation phenology on the timing and magnitude of carbon allocated below ground using measurements of root growth and indices of below ground autotrophic vs. heterotrophic respiration (via trenched plots andisotope measurements); (C) Testing whether plant allocation of carbon below ground stimulates the microbial decomposition of soil organic matter, using in situ rhizosphere simulation experiments wherein realistic quantities of artificial isotopically-labeled exudates are released into the soil; and (D) Synthesis and interpretation of the above data using the Ecosystem Demography Model 2 (ED2).

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Ecology and Evolutionary Biology
  2. Woods Hole Research Center, Falmouth, MA (United States)
  3. Boston Univ., MA (United States). Dept. of Biology
  4. Univ. of Arizona, Tucson, AZ (United States)
  5. Harvard Univ., Cambridge, MA (United States). Dept. of Organismic and Evolutionary Biology
Publication Date:
Research Org.:
Boston Univ., MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1248334
Report Number(s):
DOE-BU-0006916
DOE Contract Number:  
SC0006916
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbon cycle; carbon allocation; belowground processes; microbial model

Citation Formats

Saleska, Scott, Davidson, Eric, Finzi, Adrien, Wehr, Richard, and Moorcroft, Paul. Partitioning CO2 fluxes with isotopologue measurements and modeling to understand mechanisms of forest carbon sequestration. United States: N. p., 2016. Web. doi:10.2172/1248334.
Saleska, Scott, Davidson, Eric, Finzi, Adrien, Wehr, Richard, & Moorcroft, Paul. Partitioning CO2 fluxes with isotopologue measurements and modeling to understand mechanisms of forest carbon sequestration. United States. doi:10.2172/1248334.
Saleska, Scott, Davidson, Eric, Finzi, Adrien, Wehr, Richard, and Moorcroft, Paul. Thu . "Partitioning CO2 fluxes with isotopologue measurements and modeling to understand mechanisms of forest carbon sequestration". United States. doi:10.2172/1248334. https://www.osti.gov/servlets/purl/1248334.
@article{osti_1248334,
title = {Partitioning CO2 fluxes with isotopologue measurements and modeling to understand mechanisms of forest carbon sequestration},
author = {Saleska, Scott and Davidson, Eric and Finzi, Adrien and Wehr, Richard and Moorcroft, Paul},
abstractNote = {This project combines automated in situ observations of the isotopologues of CO2 with root observations, novel experimental manipulations of below ground processes, and isotope-enabled ecosystem modeling to investigate mechanisms of below- vs. above ground carbon sequestration at the Harvard Forest Environmental Measurements Site (EMS). The proposed objectives, which have now been largely accomplished, include: (A) Partitioning of net ecosystem CO2 exchange (NEE) into photosynthesis and respiration using long-term continuous observations of the isotopic composition of NEE, and analysis of their dynamics; (B) Investigation of the influence of vegetation phenology on the timing and magnitude of carbon allocated below ground using measurements of root growth and indices of below ground autotrophic vs. heterotrophic respiration (via trenched plots andisotope measurements); (C) Testing whether plant allocation of carbon below ground stimulates the microbial decomposition of soil organic matter, using in situ rhizosphere simulation experiments wherein realistic quantities of artificial isotopically-labeled exudates are released into the soil; and (D) Synthesis and interpretation of the above data using the Ecosystem Demography Model 2 (ED2).},
doi = {10.2172/1248334},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {1}
}