Figure 1.
Geographic location of the study sites in the northeast forest region of China.
Table 1.
Characteristics of the study sites and stands in northeastern China.
Table 2.
Soil bulk density, soil C content and soil C density in boreal and temperate forest soils (mean ±1SD) in northeastern China.
Table 3.
Effects of forest zone and stand age on forest C storage in northeastern China.
Figure 2.
C storage (mean values ±1SE, Mg·C·ha−1) in young, mid-aged, mature and over-mature stands in the boreal and temperate forest zones in northeastern China.
Notes: (1) Forest types in boreal forest zone: larch forest (LF); birch forest (BF); Forest types in temperate forest zone: coniferous mixed forest (CMF); coniferous and broadleaved mixed forest (CBF); broadleaved mixed forest (BMF). (2) Different letters within each cell indicate significant differences among the four age classes.
Figure 3.
Distribution pattern of C storage among forest components in young, mid-aged, mature, and over-mature stands in boreal and temperate forests of northeastern China.
Forest types in boreal forest zone: larch forest (LF); birch forest (BF). Forest types in temperate forest zone: coniferous mixed forest (CMF); broadleaved mixed forest (BMF); coniferous and broadleaved mixed forest (CBF).
Table 4.
Effects of forest type and stand age on C storage by forest components (tree, understory, forest floor and soil) and their percent of total C storage in boreal and temperate forests in northeastern China.
Figure 4.
C storage in 0–20 cm soil layers (mean values ±1SE, Mg·C·ha−1) and its contribution to total soil C storage across four stand age classes in boreal and temperate forests in northeastern China.
Forest types in boreal forest zone: larch forest (LF) and birch forest (BF). Forest types in temperate forest zone: coniferous mixed forest (CMF), broadleaved mixed forest (BMF), coniferous and broadleaved mixed forest (CBF). Age classes: young (A), mid-aged (B), mature (C), over-mature (D).