Biophysical controls of carbon flows in three successional Douglas-fir stands based on eddy-covariance measurements

被引:86
作者
Chen, JQ
Falk, M
Euskirchen, E
U, KTP
Suchanek, TH
Ustin, SL
Bond, BJ
Brosofske, KD
Phillips, N
Bi, RC
机构
[1] Univ Toledo, Toledo, OH 43606 USA
[2] Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA
[3] Michigan Technol Univ, Sch Forestry & Wood Prod, Houghton, MI 49931 USA
[4] Univ Calif Davis, WESTGEO, Davis, CA 95616 USA
[5] Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USA
[6] Oregon State Univ, Coll Forest Resources, Corvallis, OR 97331 USA
[7] Univ Rhode Isl, Dept Nat Resources Sci, Kingston, RI 02881 USA
[8] Boston Univ, Dept Geog, Boston, MA 02215 USA
关键词
CO2; flux; Pacific Northwest; succession; water-use efficiency;
D O I
10.1093/treephys/22.2-3.169
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
We measured net carbon flux (F-CO2) and net H2O flux (F-H2O) by the eddy-covariance method at three Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)-western hemlock (Tsuga heterophylla (Raf.) Sarg.) sites located in the Wind River Valley of southern Washington State, USA. Stands were approximately 20, 40 and 450 years old and measurements were made between June 15 and October 15 of 1998 in the 40- and 450-year-old stands, and of 1999 in the 20- and 450-year-old stands. Our objectives were to determine if there were differences among the stands in: (1) patterns of daytime F-CO2 during summer and early autumn; (2) empirically modeled relationships between local climatic factors (e.g., light, vapor pressure deficit (VPD), soil water content, temperature and net radiation) and daytime F-CO2; and (3) water-use efficiency (WUE). We used the Landsberg equation, a logarithmic power function and linear regression to model relationships between F-CO2 and physical variables. Overall, given the same irradiance, F-CO2 was 1.0-3.9 mol m(-2) s(-1) higher (P < 0.0001 for both seasons) at the two young stands than at the old-growth stand. During summer and early autumn, Fco averaged 4.2 and 6.1 mumol m(-2) s(-1) at the 20- and 40-year-old stand, respectively. In contrast, the 450-year-old forest averaged 2.2 and 3.2 mumol m(-2) s(-1) in 1998 and 1999, respectively. Increases in VPD were associated with reduced F-CO2 at all three stands, with the greatest apparent constraints occurring at the old-growth stand. Correlations between F-CO2 and all other environmental variables differed among ecosystems, with soil temperature showing a negative correlation and net radiation showing a positive correlation. In the old-growth stand, WUE was significantly greater (P < 0.0001) in the drier summer of 1998 (2.7 mg g(-1)) than in 1999 (1.0 mg g(-1)). Although we did not use replicates in our study, the results indicate that there are large differences in Fco, among Douglas-fir stands of different ages growing in the same general area, and that variations in age structure and site conditions need to be considered when scaling flux measurements from individual points to the landscape level.
引用
收藏
页码:169 / 177
页数:9
相关论文
共 42 条
[31]   Canopy and hydraulic conductance in young, mature and old Douglas-fir trees [J].
Phillips, N ;
Bond, BJ ;
McDowell, NG ;
Ryan, MG .
TREE PHYSIOLOGY, 2002, 22 (2-3) :205-211
[32]  
Rosenberg N.J., 1983, Microclimate: The Biological Environment
[33]   Contribution of increasing CO2 and climate to carbon storage by ecosystems in the United States [J].
Schimel, D ;
Melillo, J ;
Tian, HQ ;
McGuire, AD ;
Kicklighter, D ;
Kittel, T ;
Rosenbloom, N ;
Running, S ;
Thornton, P ;
Ojima, D ;
Parton, W ;
Kelly, R ;
Sykes, M ;
Neilson, R ;
Rizzo, B .
SCIENCE, 2000, 287 (5460) :2004-2006
[34]   Climate change - managing forests after Kyoto [J].
Schulze, ED ;
Wirth, C ;
Heimann, M .
SCIENCE, 2000, 289 (5487) :2058-2059
[35]  
SPIES T A, 1991, U S Forest Service General Technical Report PNW, P91
[36]   Leaf area index of an old-growth Douglas-fir forest estimated from direct structural measurements in the canopy [J].
Thomas, SC ;
Winner, WE .
CANADIAN JOURNAL OF FOREST RESEARCH, 2000, 30 (12) :1922-1930
[37]   MONITORING GLOBAL CHANGE - COMPARISON OF FOREST COVER ESTIMATES USING REMOTE-SENSING AND INVENTORY APPROACHES [J].
TURNER, DP ;
KOERPER, G ;
GUCINSKI, H ;
PETERSON, C ;
DIXON, RK .
ENVIRONMENTAL MONITORING AND ASSESSMENT, 1993, 26 (2-3) :295-305
[38]   Respiration as the main determinant of carbon balance in European forests [J].
Valentini, R ;
Matteucci, G ;
Dolman, AJ ;
Schulze, ED ;
Rebmann, C ;
Moors, EJ ;
Granier, A ;
Gross, P ;
Jensen, NO ;
Pilegaard, K ;
Lindroth, A ;
Grelle, A ;
Bernhofer, C ;
Grünwald, T ;
Aubinet, M ;
Ceulemans, R ;
Kowalski, AS ;
Vesala, T ;
Rannik, Ü ;
Berbigier, P ;
Loustau, D ;
Guömundsson, J ;
Thorgeirsson, H ;
Ibrom, A ;
Morgenstern, K ;
Clement, R ;
Moncrieff, J ;
Montagnani, L ;
Minerbi, S ;
Jarvis, PG .
NATURE, 2000, 404 (6780) :861-865
[39]   Use of a physiological process model with forestry yield tables to set limits on annual carbon balances [J].
Waring, RH ;
McDowell, N .
TREE PHYSIOLOGY, 2002, 22 (2-3) :179-188
[40]   SCALING GROSS ECOSYSTEM PRODUCTION AT HARVARD FOREST WITH REMOTE-SENSING - A COMPARISON OF ESTIMATES FROM A CONSTRAINED QUANTUM-USE EFFICIENCY MODEL AND EDDY-CORRELATION [J].
WARING, RH ;
LAW, BE ;
GOULDEN, ML ;
BASSOW, SL ;
MCCREIGHT, RW ;
WOFSY, SC ;
BAZZAZ, FA .
PLANT CELL AND ENVIRONMENT, 1995, 18 (10) :1201-1213