Carbon sequestration and turnover in soil under the energy crop Miscanthus: repeated 13C natural abundance approach and literature synthesis

The stability and turnover of soil organic matter (SOM) are a very important but poorly understood part of carbon (C) cycling. Conversion of C3 grassland to the C4 energy crop Miscanthus provides an ideal opportunity to quantify medium-term SOM dynamics without disturbance (e.g., plowing), due to the natural shift in the δ13C signature of soil C. For the first time, we used a repeated 13C natural abundance approach to measure C turnover in a loamy Gleyic Cambisol after 9 and 21 years of Miscanthus cultivation. This is the longest C3–C4 vegetation change study on C turnover in soil under energy crops. SOM stocks under Miscanthus and reference grassland were similar down to 1 m depth. However, both increased between 9 and 21 years from 105 to 140 mg C ha−1 (P < 0.05), indicating nonsteady state of SOM. This calls for caution when estimating SOM turnover based on a single sampling. The mean residence time (MRT) of old C (>9 years) increased with depth from 19 years (0–10 cm) to 30–152 years (10–50 cm), and remained stable below 50 cm. From 41 literature observations, the average SOM increase after conversion from cropland or grassland to Miscanthus was 6.4 and 0.4 mg C ha−1, respectively. The MRT of total C in topsoil under Miscanthus remained stable at ~60 years, independent of plantation age, corroborating the idea that C dynamics are dominated by recycling processes rather than by C stabilization. In conclusion, growing Miscanthus on C-poor arable soils caused immediate C sequestration because of higher C input and decreased SOM decomposition. However, after replacing grasslands with Miscanthus, SOM stocks remained stable and the MRT of old C3-C increased strongly with depth. ©2017 The Authors. Global Change Biology Bioenergy Published by John Wiley & Sons Ltd.

Zang H.1 , Blagodatskaya E.2, 3 , Wen Y.4 , Xu X.5 , Dyckmans J.6 , Kuzyakov Y. 1, 7, 8
Blackwell Publishing Ltd
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  • 1 Department of Agricultural Soil Science, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 2 Department of Soil Science and Temperate Ecosystems, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 3 Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, Pushchino, 142290, Russian Federation
  • 4 Department of Soil Science of Tropical and Subtropical Ecosystems, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 5 Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources, Chinese Academy of Sciences, Beijing, 100101, China
  • 6 Centre for Stable Isotope Research and Analysis, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 7 Institute of Environmental Sciences, Kazan Federal University, Kazan, 420049, Russian Federation
  • 8 Agro-Technology Institute, RUDN University, Moscow, Russian Federation
Ключевые слова
13C natural abundance; C3–C4 vegetation change; carbon sequestration; energy crop; mean residence time; soil organic matter
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