Main content area

Variability of soil respiration at different spatial scales in temperate forests

Shi, Baoku, Jin, Guangze
Biology and fertility of soils 2016 v.52 no.4 pp. 561-571
Pinus koraiensis, basal area, carbon nitrogen ratio, collars, coniferous forests, cutting, environmental factors, forest stands, growing season, landscapes, soil heterogeneity, soil organic carbon, soil respiration, temperate forests, tree and stand measurements, trees, China
To identify the controlling factors of the variability of soil respiration (R S) at multiple spatial scales, R S was measured along with environmental factors, tree diameter at breast height (DBH), and soil properties for four typical forest types in northeastern China, including the primary mixed broad-leaved Korean pine (Pinus koraiensis) forest (BKPF), spruce-fir valley forest (SVF), selective cutting of mixed broad-leaved Korean pine forest (SCF), and Korean pine plantation (KPP), throughout the growing season (May–October) in 2013. The variability of R S was quantified and compared at the following three spatial scales: among collars within a plot, among plots within a specific forest stand, and among forest stands within the landscape. The average coefficients of variations of R S within plots (30–52 %) were significantly higher than those of R S among plots (20–25 %) in each forest stand (P < 0.05). The water-filled pore space and mean DBH of trees within 8 m of the measurement collars explained 72 % of the variability of R S within the BKPF. The variabilities of R S within the SVF, SCF, and KPP were explained by the soil organic C content, soil C:N ratio, and mean DBH and total basal area of trees within a few meters of the measurement collars. The variability of R S across the four forest stands was best explained by the soil C:N ratio (R ² = 0.63, P = 0.001).