Spatial variability of soil respiration in a 64-year-old longleaf pine forest

被引:13
作者
ArchMiller, Althea A. [1 ,3 ]
Samuelson, Lisa J. [1 ]
Li, Yingru [2 ]
机构
[1] Auburn Univ, Sch Forestry & Wildlife Sci, 3301 SFWS Bldg, Auburn, AL 36849 USA
[2] Univ Cent Florida, Dept Sociol, Orlando, FL 32816 USA
[3] Univ Minnesota, Dept Fisheries Wildlife & Conservat Biol, 2003 Upper Buford Circle,Skok Hall 135, St Paul, MN 55108 USA
基金
美国食品与农业研究所;
关键词
Pinus palustris; Soil CO2 efflux; Residual kriging; Soil carbon; Root biomass; Litter; CO2; EFFLUX; HETEROTROPHIC RESPIRATION; TEMPORAL VARIATION; ROOT RESPIRATION; PRESCRIBED FIRE; CARBON; COMPONENTS; MOISTURE; HETEROGENEITY; TEMPERATURE;
D O I
10.1007/s11104-016-2817-1
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The objectives of this study were to determine the spatial structure of soil respiration (Rs) in a naturally-regenerated longleaf pine forest and to assess the ecological factors affecting the spatial variability in Rs. Soil respiration, soil temperature (Ts), and soil moisture were repeatedly measured over 6 days in summer 2012 in 3 semi-independent plots. Edaphic, forest floor, and root variables were measured. Diameters of 338 trees were mapped. Spatial analysis and regression were applied. Soil respiration was spatially autocorrelated across plots (66-92 m), but not within plots (6-34 m). Spatial distributions of Rs were relatively stable from morning through early evening and were decoupled from temporal variation of Ts. Ecological covariates (e.g., soil moisture, bulk density and carbon, litter mass, understory cover, roots, nearby trees) related to the spatial variability in Rs; however, models varied between plots. This study shows the importance of stationary plant and soil factors in determining the spatial, temperature-independent distribution of Rs in a heterogeneous forest. We suggest the need for a better understanding of the complex interactions between the heterotrophic, autotrophic, and physical processes driving Rs in order to better model forest carbon budgets.
引用
收藏
页码:419 / 435
页数:17
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