Effects of afforestation on soil organic matter characteristics under subtropical forests with low elevation |
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| Authors: | Shih-Hao Jien Tsai-Huei Chen Chih-Yu Chiu |
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| Institution: | (1) Biodiversity Research Center, Academia Sinica, Taipei, 115-29, Taiwan;(2) Department of Soil and Water Conservation, National Pingtung University of Science and Technology, Pingtung, 912-01, Taiwan;(3) Division of Silviculture, Taiwan Forestry Research Institute, Taipei, 100-66, Taiwan; |
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| Abstract: | We selected sites of natural broad-leaved forests and adjacent coniferous plantations (Cunninghamia konishii and Calocedrus formosana of 30 and 80 years old, respectively) in central Taiwan to evaluate the effects of plantations on soil organic matter (SOM)
characteristics and composition. SOM was characterized by chemical analyses, solid-state 13C cross-polarization magic-angle nuclear magnetic resonance (CPMAS 13C NMR), and optical measurements. Semiquantitative analysis of CPMAS 13C NMR spectra showed the litter of broad-leaved forests to be less resistant to decomposition than that of coniferous forests.
The humification degree of SOM was higher under broad-leaved than coniferous forests because of the relatively high percentage
of aromatic C and carboxyl C in the humic acids (HAs) of A horizons under broad-leaved forests. Additionally, the E
4/E
6 ratio of HAs was lower in the A horizon under broad-leaved than coniferous forests, which reflected more condensation of
SOM. High alkyl C content under coniferous forests could be attributed to needle litter quality, which has a high content
of waxes or lipids. Afforestation with conifers induced accumulation of the litterfall layer, gradually increased SOM concentrations,
and changed the composition structures of SOM in the topsoils. |
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