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Slow decomposition of very fine roots and some factors controlling the process: a 4-year experiment in four temperate tree species

Plant and Soil volume 372, pages 445–458 (2013)Cite this article

Abstract

Background and aims

Despite our growing appreciation of the large contribution made by fine roots to soil organic carbon pool and nutrient cycling, their decomposition dynamics still remain poorly quantified.

Methods

In a field experiment, we conducted a 4-year litterbag study on different root size classes (< 0.5 and 0.5–2.0 mm) in four temperate tree species.

Results

Very fine roots (< 0.5 mm) decomposed more slowly than 0.5–2.0 mm roots in the four species roots studied in both the initial and later phases of root decomposition. Of all the root tissue chemistry we measured, decomposition rates correlated best with acid-unhydrolyzable fraction concentrations. However, no correlation was found for any of the nutrient related root quality parameters and decomposition rates. In contrast to mass loss, root net N released declined more rapidly in very fine roots (< 0.5 mm) than in 0.5–2.0 mm roots. Additionally, much of nitrogen was released in the final stages of decomposition, during which the recalcitrant carbon compounds were decomposed.

Conclusions

We conclude that the quality of carbon in root detritus and not the concentration of initial nutrients control its decomposition dynamics in a relatively nutrient-rich soil in northeastern China. These patterns can be explained by lower easily accessible labile carbon and higher recalcitrant carbon fractions in very fine roots (< 0.5 mm) than in 0.5–2.0 mm roots, at least in the four species we studied.

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Acknowledgements

The authors thank Guohua Song, Quanbo Wang for assistance in the field. We also thank Dr. Björn Berg for suggestions that improved earlier versions of this work. The funding for this research was supported by National Basic Research Program (973 Program) (2010CB951301) and National Natural Science Foundation of China (No. 31270494 and 31070350).

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  1. Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, 150040, People’s Republic of China

    Tao Sun, Zijun Mao & Yingying Han

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  1. Tao Sun
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  2. Zijun Mao
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Correspondence to Zijun Mao.

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Sun, T., Mao, Z. & Han, Y. Slow decomposition of very fine roots and some factors controlling the process: a 4-year experiment in four temperate tree species. Plant Soil 372, 445–458 (2013). https://doi.org/10.1007/s11104-013-1755-4

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