Abstract
A published meta-analysis of worldwide data showed soil carbon decreasing following land use change from pasture to conifer plantation. A paired site (a native pasture with Themeda triandra dominant, and an adjacent Pinus radiata plantation planted onto the pasture 16 years ago) was set up as a case study to assess the soil carbon reduction and the possible reason for the reduction under pine, including the change in fine root (diameter <2 mm) dynamics (production and mortality). Soil analysis confirmed that soil carbon and nitrogen stocks to 100 cm under the plantation were significantly less than under the pasture by 20 and 15%, respectively. A 36% greater mass of fine root was found in the soil under the pasture than under the plantation and the length of fine root was about nine times greater in the pasture. Much less fine root length was produced and roots died more slowly under the plantation than under the pasture based on observations of fine root dynamics in minirhizotrons. The annual inputs of fine root litter to the top 100 cm soil, estimated from soil coring and minirhizotron observations, were 6.3 Mg dry matter ha−1 year−1 (containing 2.7 Mg C and 38.9 kg N) under the plantation, and 9.7 Mg ha−1 year−1 (containing 3.6 Mg C and 81.4 kg N) under the pasture. The reduced amount of carbon, following afforestation of the pasture, in each depth-layer of the soil profile correlated with the lower length of dead fine roots in the layer under the plantation compared with the pasture. This correlation was consistent with the hypothesis that the soil carbon reduction after land use change from pasture to conifer plantation might be related to change of fine root dynamics, at least in part.
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Acknowledgments
Michael Halliday, Bruce Robertson and Semy Siakimotu are acknowledged for their technical support. ACT Forests and Ken McInnes (pasture landowner) kindly gave permission to use the Kowen Forest site and the pasture site respectively. NSW Forests lent us the rotating soil corer for fine root sampling.
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Guo, L.B., Wang, M. & Gifford, R.M. The change of soil carbon stocks and fine root dynamics after land use change from a native pasture to a pine plantation. Plant Soil 299, 251–262 (2007). https://doi.org/10.1007/s11104-007-9381-7
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DOI: https://doi.org/10.1007/s11104-007-9381-7