Soil organic carbon stock and chemical composition in four plantations of indigenous tree species in subtropical China |
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Authors: | Hui Wang Shi-Rong Liu Jiang-Ming Mo Jing-Xin Wang Franz Makeschin Maria Wolff |
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Institution: | (1) Key Laboratory of Forest Ecology and Environment, China’s State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, No. 1 Dongxiaofu, Haidian District, Beijing, 100091, China;(2) South China Botanical Garden, Chinese Academy of Sciences, Dinghu, Zhaoqing, 526070, Guangdong, China;(3) Division of Forestry and Natural Resources, West Virginia University, P.O. Box 6215, Morgantown, WV 26506-6125, USA;(4) Faculty of Forest, Geo and Hydro Sciences, Institute of Soil Science, Dresden University of Technology, P.O. Box 1117, 01735 Tharandt, Germany |
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Abstract: | Subtropical China has more than 60% of the total plantation area in China and over 70% of these subtropical plantations are
composed of pure coniferous species. In view of low ecosystem services and ecological instability of pure coniferous plantations,
indigenous broadleaf plantations are being advocated as a prospective silvicultural management for substituting in place of
large coniferous plantations in subtropical China. However, little information is known about the effects of tree species
conversion on stock and stability of soil organic carbon (SOC). The four adjacent monospecific plantations were selected to
examine the effects of tree species on the stock and chemical composition of SOC using elemental analysis and solid-state
13C nuclear magnetic resonance (NMR) spectroscopy. One coniferous plantation was composed of Pinus massoniana (PM), and the three broadleaf plantations were Castanopsis hystrix (CH), Michelia macclurei (MM), and Mytilaria laosensis (ML). We found that SOC stock differed significantly among the four plantations in the upper (0–10 cm) layer, but not in
the underneath (10–30 cm) layer. SOC stocks in the upper (0–10 cm) layer were 11, 19, and 18% higher in the CH, MM, and ML
plantations than in the PM plantation. The differences in SOC stock among the four plantations were largely attributed to
fine root rather than aboveground litterfall input. However, the soils in the broadleaf plantations contained more decomposable
C proportion, indicated by lower percentage of alkyl C, higher percentage of O-alkyl C and lower alkyl C/O-alkyl C ratio compared to those in the PM plantation. Our findings highlight that future strategy of tree species selection
for substituting in place of large coniferous plantations in subtropical China needs to consider the potential effects of
tree species on the chemical composition in addition to the quantity of SOC stock. |
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