Affiliation:
1. Center for Ecological Research, Northeast Forestry University, Harbin 150040, China.
2. Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2E3, Canada.
3. School of Forestry, Northeast Forestry University, Harbin 150040, China.
Abstract
Temperate forests in northeastern China play a key role in the national carbon (C) budget; however, this role has been poorly quantified. The objective of this study was to quantify C storage, net primary production (NPP), and net ecosystem production (NEP) in four major temperate forest types in northeastern China. The four forest types include a primary mixed broadleaf – Korean pine (Pinus koraiensis Siebold & Zucc.) old-growth forest and three mid-aged regenerating forests, i.e., a secondary birch (Betula platyphylla Sukaczev) forest, a Korean pine plantation, and a Dahurian larch (Larix gmelinii (Rupr.) Rupr.) plantation. Total C storage differed significantly among the four forest types, with the highest storage (315.4 t C·ha−1) in the old-growth forest. Soil organic C accounted for 55%–70% of the ecosystem C, whereas vegetation C accounted for 28%–43% of the ecosystem C. Soil organic C storage in the two plantations was significantly lower than that in old-growth and secondary birch forests. The allocation (aboveground and belowground) of NPP, but not the total NPP, differed significantly among the forest types. Litterfall (44%–60%) and fine root production (43%–47%) contributed the largest proportion of the aboveground and belowground NPP, respectively. The highest NEP was in the Korean pine plantation (328.0 g C·m−2·year−1), followed by the old-growth (311.9 g C·m−2·year−1) and secondary birch (231.1 g C·m−2·year−1) forests, with the lowest NEP in the Dahurian larch plantation (187.9 g C·m−2·year−1). These results suggest that the major forest types are currently C sinks and Korean pine plantation establishment can be a promising approach for increasing C sequestration in northeastern China.
Publisher
Canadian Science Publishing
Subject
Ecology,Forestry,Global and Planetary Change
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