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Shifting sources of soil labile organic carbon after termination of plant carbon inputs in a subtropical moist forest of southwest China

Abstract

Labile organic carbon (LOC) is a critical component of soil organic carbon (C) because of its intimate association with soil heterotrophic respiration and role in the decomposition of resistant soil organic matter. In a subtropical moist evergreen broad-leaved forest of southwest China, we examined changes of LOC and its potential turnover time, microbial biomass C (MBC), and soil microbial activity of the organic and the 0–10 cm mineral soil layers with aboveground plant litter and belowground root treatments. In February of 2004, removal of organic layer, root-trenching, and tree-girdling treatments were applied alone and in combination to manipulate plant-C inputs. In 2006, root-trenching and tree-girdling treatments did not significantly change LOC in the organic layer. In the 0–10 cm mineral soil layer, LOC increased substantially due to tree-girdling treatment, especially in the plots of tree-girdling and the combinations of three treatments, but this increase was absent in 2007. Soil MBC in these two layers generally did not change markedly after plant-C inputs manipulations except significant increase under tree-girdling treatment in 2006. The potential turnover times of LOC increased in all plots with the plant-C inputs manipulations. The lack of influence of plant-C inputs manipulations on LOC pools is likely due to high total soil organic C here, while insignificant changes of MBC suggest the soil microbes are not C limited in this forest. The changes of the potential turnover time of LOC imply that the sources of LOC have been shifted from fresh plant litter or root exudates to old soil organic C. Our results suggest that LOC recently derived from plants is preferred by microbes when available, but microbes can also use LOC from soil organic matter when fresh plant C is not available.

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References

  1. Alvarez R, Alvarez CR (2000) Soil organic matter pools and their associations with carbon mineralization kinetics. Soil Sci Soc Am J 64:184–189

  2. Blair GJ, Lefroy RDB, Lisle L (1995) Soil carbon fractions based on their degree of oxidation, and the development of a carbon management index for agricultural systems. Aust J Agric Res 46:1459–1466

  3. Brant JB, Myrold DD, Sulzman EW (2006) Root controls on soil microbial community structure in forest soils. Oecologia 148:650–659

  4. Carter MR (1993) Soil sampling and methods of analysis. Lewis Publishers, Toronto

  5. Carter MR, Gregorich EG, Angers DA, Donald RG, Bolinder MA (1998) Organic C and N storage, and organic C fractions, in adjacent cultivated and forested soils of eastern Canada. Soil Till Res 47:253–261

  6. Chapin FS, Matson PA, Mooney HA (2002) Principles of terrestrial ecosystem ecology. Springer, New York

  7. Dannenmann M, Simon J, Gasche R, Holst J, Naumann PS, Köegel-Knabner I, Knicker H, Mayer H, Schloter M, Pena R, Polle A, Rennenberg H, Papen H (2009) Tree girdling provides insight on the role of labile carbon in nitrogen partitioning between soil microorganisms and adult European beech. Soil Biol Biochem 41:1622–1631

  8. Don A, Kalbitz K (2005) Amount and degradability of dissolved organic carbon from foliar litter at different decomposition stages. Soil Biol Biochem 37:2171–2179

  9. Feng WT, Zou XM, Schaefer DA (2009) Above- and belowground carbon inputs affect seasonal variations of soil microbial biomass in a subtropical monsoon forest of southwest China. Soil Biol Biochem 41:978–983

  10. Gan J, Xue J, Xie S, Zhao H (1997) Soil water holding capacity in the evergreen broad-leaved forest of Ailao Mountains in Yunnan. Forestry Sci Technol 22(6):9–11 (in Chinese)

  11. Ghani A, Dexter M, Perrott KW (2003) Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilization, grazing and cultivation. Soil Biol Biochem 35:1231–1243

  12. Gough CM, Flower CE, Vogel CS, Dragoni D, Curtis PS (2009) Whole-ecosystem labile carbon production in a north temperate deciduous forest. Agric For Meteorol 149:1531–1540

  13. Gregorich EG, Janzen HH (1996) Storage of soil carbon in the light fraction and macro organic matter. In: Carter MA, Stewart BA (eds) Structure and organic matter storage in agricultural soils. Lewis Publishers, Boca Raton, pp 167–190

  14. Hamer U, Marschner B (2005) Priming effects in different soil types induced by fructose, alanine, oxalic acid and catechol additions. Soil Biol Biochem 37:445–454

  15. Högberg P, Nordgren A, Buchmann N, Taylor AFS, Ekblad A, Högberg MN, Nyberg G, Ottosson-Löfvenius M, Read DJ (2001) Large-scale forest girdling shows that current photosynthesis drives soil respiration. Nature 411:789–792

  16. Jenkinson DA, Powlson DS (1976) The effects of biocidal treatment on metabolism in soil––V. A method for measuring soil biomass. Soil Biol Biochem 8:209–213

  17. Jiang PK, Xu QF (2006) Abundance and dynamics of soil labile carbon pools under different types of forest vegetation. Pedosphere 16:505–511

  18. Jones DL, Hodge A, Kuzyakov Y (2004) Plant and mycorrhizal regulation of rhizodeposition. New Phytol 163:459–480

  19. Kuzyakov Y (2002) Review: factors affecting rhizosphere priming effects. J Plant Nutr Soil Sci 165:382–396

  20. Leite LFC, Mendonca ES, Machado PLOA, Matos ES (2003) Total C and N storage and organic C pools of a Red-Yellow Podzolic under conventional and no tillage at the Atlantic Forest Zone, south-eastern Brazil. Aust J Soil Res 41:717–730

  21. Li YQ, Xu M, Zou XM, Xia Y (2005) Soil CO2 efflux and fungal and bacterial biomass in a plantation and a secondary forest in wet tropics in Puerto Rico. Plant Soil 268:151–160

  22. Olson JS (1963) Energy storage and the balance of producers and decomposers in ecological systems. Ecology 44:322–331

  23. Park J-H, Matzner E (2003) Controls on the release of dissolved organic carbon and nitrogen from a deciduous forest floor investigated by manipulations of aboveground litter inputs and water flux. Biogeochemistry 66:265–286

  24. Roscoe R, Buurman P (2003) Tillage effects on soil organic matter in density fractions of a Cerrado Oxisol. Soil Till Res 70:107–119

  25. SAS Institute Inc. (1999) SAS Statistical Software. SAS Institute Inc., Cary

  26. Schaefer DA, Feng WT, Zou XM (2009) Plant carbon inputs and environmental factors strongly affect soil respiration in a subtropical forest of southwestern China. Soil Biol Biochem 41:1000–1007

  27. Schlesinger WH (1995) Biogeochemistry: an analysis of global change. Academic Press, California

  28. Sparling G, Vojvodic-Vukovic M, Schipper LA (1998) Hot-water-soluble C as a simple measure of labile soil organic matter: the relationship with microbial biomass C. Soil Biol Biochem 30:469–1472

  29. Stanford G, Smith SJ (1972) Nitrogen mineralization potentials of soils. Soil Sci Soc Am J 36:465–472

  30. Vance ED, Brookes PC, Jenkinson DS (1987) An extraction method for measuring soil microbial biomass-C. Soil Biol Biochem 19:703–707

  31. Wu ZY, Qu ZX, Jiang HQ (1983) Research of forest ecosystem on Ailao Mountains, Yunnan. Yunnan Science and Technology Press, Kunming

  32. Zak DR, Tilman D, Parmenter RR, Rice CW, Fisher FM, Vose J, Milchunas D, Martin CW (1994) Plant production and soil microorganisms in late-successional ecosystems––a continental-scale study. Ecology 75:2333–2347

  33. Zhang M, Zou XM (2009) Comparison of soil C and N in rubber plantation and seasonal rain forest. Chin J Appl Ecol 20:1079–1085

  34. Zou XM, Ruan HH, Fu Y, Yang XD, Sha LQ (2005) Estimating soil labile organic carbon and potential turnover rates using a sequential fumigation–incubation procedure. Soil Biol Biochem 37:1923–1928

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Acknowledgments

We are grateful to the Bureau of Nature Reserve of Jingdong County for giving the permission to carry out this experiment in the Ailao Mountain Nature Reserve. We thank Yun Fu for the help for the chemical analyses, and Lingling Shi for providing unpublished data on the soil microbial community. We also appreciate the support in the field by the staff of the Ailaoshan Nature Reserve. This is a research contribution from the Ailaoshan Station for Subtropical Forest Ecosystem Studies (ASSFE), Chinese Academy of Sciences, and the Ailaoshan National Ecosystem Observation Research Network Station, Chinese Ecological Research Network, Jingdong, Yunnan, P. R. China. This study was financially supported by the Natural Science Foundation of Yunnan (2005C0056M), Wang K. C. Foundation, and Xishuangbanna Tropical Botanical Garden of the Chinese Academy of Sciences.

Author information

Correspondence to Wenting Feng.

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Feng, W., Schaefer, D.A., Zou, X. et al. Shifting sources of soil labile organic carbon after termination of plant carbon inputs in a subtropical moist forest of southwest China. Ecol Res 26, 437–444 (2011). https://doi.org/10.1007/s11284-010-0796-x

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Keywords

  • Girdling
  • Microbial biomass carbon
  • Sequential fumigation incubation
  • Soil labile organic carbon
  • Trenching
  • Turnover time