Stand density and species richness affect carbon storage and net primary productivity in early and late successional temperate forests differently |
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Authors: | Huiying Cai Xueying Di Scott X. Chang Guangze Jin |
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Affiliation: | 1.Center for Ecological Research,Northeast Forestry University,Harbin,China;2.School of Forestry,Northeast Forestry University,Harbin,China;3.Department of Renewable Resources,University of Alberta,Edmonton,Canada |
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Abstract: | How stand density and species richness affect carbon (C) storage and net primary productivity (NPP) changes with forest succession is poorly understood. We quantified the C storage of trees and the aboveground NPP in an early successional secondary birch forest (birch forest) and a late successional mixed broadleaf-Korean pine (Pinus koraiensis) forest (mixed forest) in northeastern China. We found that: 1) tree C storage in the mixed forest (120.3 Mg C ha?1) was significantly higher than that in the birch forest (78.5 Mg C ha?1), whereas the aboveground NPP was not different between the two forest types; and 2) only stand density had a positive linear relationship with tree C storage and aboveground NPP in the birch forest. In the mixed forest, both tree C storage and aboveground NPP were significantly affected by the combination of the stand density and species richness. The tree C storage to stand density and species richness relationships were hump-shaped. The aboveground NPP increased with increasing stand density, but its relationship to species richness was hump-shaped. We conclude that the effect of stand density and species richness on tree C storage and aboveground NPP was influenced by forest stand succession, and such effects should be considered in studying stand density- and species richness- ecosystem function (e.g., C storage and NPP) relationships in temperate forest ecosystems. |
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