Continuous measurements of soil respiration with and without roots in a ponderosa pine plantation in the Sierra Nevada Mountains

被引:132
作者
Tang, JW
Misson, L
Gershenson, A
Cheng, WX
Goldstein, AH
机构
[1] Univ Minnesota, Dept Forest Resources, St Paul, MN 55108 USA
[2] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA
[3] Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95064 USA
关键词
CO2; efflux; concentration; gradient; heterotrophic respiration; pulse; root respiration;
D O I
10.1016/j.agrformet.2005.07.011
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Continuous measurements of soil respiration and its components help us understand diurnal and seasonal variations in soil respiration and its mechanism. We continuously measured CO2 concentration at various depths in the soil and calculated surface CO2 efflux based on CO2 gradients and diffusivity in a young ponderosa pine plantation in the Sierra Nevada Mountains of California. We determined soil respiration both in a control plot that included roots and in a trenched plot that had no roots. The difference between these plots was used to partition soil respiration into root respiration and heterotrophic respiration. We found that both CO2 concentration in the soil and surface CO2 efflux in the control plot were higher than in the trenched plot. The diurnal range of soil respiration in the trenched plot was larger than in the control. We observed dramatic pulses of soil respiration in response to rain events in summer and fall during the dry season. We modeled the seasonal variation in soil respiration without the pulses using soil temperature and moisture as driving variables and simulated soil respiration pulses using an exponential decay function in response to the volume of rain. Daily mean soil respiration peaked at 5.0 mu mol m(-2) s(-1) in the control and at 2.7 mu mol m(-2) s(-1) in the trenched plot in June before the rain pulses. Soil respiration increased from 4.9 to 8.2 and to 12.1 mu mol m(-2) s(-1) after the first and second rain events in the control, and increased from 2.2 to 4.1 and to 6.6 mu mol m(-2) s(-1) in the trenched plot. After incorporating the pulse effect, the model simulated measured data well. Annual soil respiration in 2003 was estimated as 1184 g C m(-2) y(-1). The average ratio of root over total respiration was 0.56 during the growing season and 0.16 during the non-growing season with an annual average of 0.44. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:212 / 227
页数:16
相关论文
共 60 条
[1]   Thermal acclimation and the dynamic response of plant respiration to temperature [J].
Atkin, OK ;
Tjoelker, MG .
TRENDS IN PLANT SCIENCE, 2003, 8 (07) :343-351
[2]   TRACE GAS-EXCHANGE ABOVE THE FLOOR OF A DECIDUOUS FOREST .1. EVAPORATION AND CO2 EFFLUX [J].
BALDOCCHI, DD ;
MEYERS, TP .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1991, 96 (D4) :7271-7285
[3]  
BIRCH H. F., 1958, Plant and Soil, V10, P9, DOI 10.1007/BF01343734
[4]  
BIRCH HF, 1959, PLANT SOIL, V3, P262
[5]   Roots exert a strong influence on the temperature sensitivity of soil respiration [J].
Boone, RD ;
Nadelhoffer, KJ ;
Canary, JD ;
Kaye, JP .
NATURE, 1998, 396 (6711) :570-572
[6]   CONTRIBUTIONS OF ABOVEGROUND LITTER, BELOWGROUND LITTER, AND ROOT RESPIRATION TO TOTAL SOIL RESPIRATION IN A TEMPERATURE MIXED HARDWOOD FOREST [J].
BOWDEN, RD ;
NADELHOFFER, KJ ;
BOONE, RD ;
MELILLO, JM ;
GARRISON, JB .
CANADIAN JOURNAL OF FOREST RESEARCH, 1993, 23 (07) :1402-1407
[7]   Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model [J].
Cox, PM ;
Betts, RA ;
Jones, CD ;
Spall, SA ;
Totterdell, IJ .
NATURE, 2000, 408 (6809) :184-187
[8]   Minimizing artifacts and biases in chamber-based measurements of soil respiration [J].
Davidson, EA ;
Savage, K ;
Verchot, LV ;
Navarro, R .
AGRICULTURAL AND FOREST METEOROLOGY, 2002, 113 (1-4) :21-37
[9]  
Davies Julian, 1998, Clin Microbiol Infect, V4, P2, DOI 10.1111/j.1469-0691.1998.tb00326.x
[10]   Measuring forest floor CO2 fluxes in a Douglas-fir forest [J].
Drewitt, GB ;
Black, TA ;
Nesic, Z ;
Humphreys, ER ;
Jork, EM ;
Swanson, R ;
Ethier, GJ ;
Griffis, T ;
Morgenstern, K .
AGRICULTURAL AND FOREST METEOROLOGY, 2002, 110 (04) :299-317