Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-62
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
11 Apr 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
Accumulation of soil organic C and N in planted forests fostered by tree species mixture
Yan Liu1, Pifeng Lei1,2, Wenhua Xiang1, Wende Yan1,2, and Xiaoyong Chen2,3 1Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China
2National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
3Division of Science, College of Arts and Sciences, Governors State University, University Park, Illinois 60484, USA
Abstract. With the increasing trend of converting monocultures into mixed forests, more and more studies were carried out to investigate the admixing effects on the tree growth and aboveground carbon storage. However, few studies have considered the impact of mixed forests on the belowground carbon sequestration, and changes of soil carbon and nitrogen stock as forest grows in particular. In this study, paired pure Pinus massoniana plantations, Cinnamomum camphora plantations and mixed Pinus massoniana-Cinnamomum camphora plantations at ages of 10, 24 and 45 years were selected to test whether the mixed plantations sequestrate more organic carbon (OC) and nitrogen (N) in soils and whether this admixing effect becomes more pronounced with stand ages. The results showed that tree species identity and composition as well as stand age significantly affect soil OC and N stock. The soil OC and N stocks were the highest in mixed Pinus-Cinnamomum stands compared to those in counterpart monocultures within the same age in the whole soil profiles or specific soil depth layers (0–10 cm, 10–20 cm and 20–30 cm) for most cases, followed by Cinnamomum stands, and the Pinus stands the lowest. And these positive admixing effects were mostly non-additive. Along chronosequence, the soil OC stock capacity peaked at 24-yr-old stand and maintained relatively stable thereafter. The admixing effects were also the highest at this stage. However, at topsoil layer, the admixing effects increased with stand ages in terms of soil OC stocks. When comparing mixed Pinus-Cinnamomum plantations with corresponding monocultures within the same age, the soil N stock in mixed stands was 8.30 %, 11.17 % and 31.45 % higher than the predicted mean value estimated from counterpart pure species plantations in 10-yr-old, 24-yr-old and 45-yr-old stands, respectively, suggesting these admixing effects were more pronounced along chronosequence.

Citation: Liu, Y., Lei, P., Xiang, W., Yan, W., and Chen, X.: Accumulation of soil organic C and N in planted forests fostered by tree species mixture, Biogeosciences Discuss., doi:10.5194/bg-2017-62, in review, 2017.
Yan Liu et al.
Yan Liu et al.
Yan Liu et al.

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Short summary
Here we intented to investigate soil carbon and nitrogen stock in pairwised mixed plantations and in corresponding monocultures at different stand ages to assess the effects of admixture on soil carbon and nitrogen over time. Our results showed that the admixtures created age-dependent positive effects on carbon sequestration and soil nitrogen stock, indicating the capacity of carbon sequestration and nitrogen retention in mixed forests was age related, so was maginitude of admixing effects.
Here we intented to investigate soil carbon and nitrogen stock in pairwised mixed plantations...
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