NDLI: The change of soil carbon stocks and fine root dynamics after land use change from a native pasture to a pine plantation

Content Provider	Springer Nature Link
Author	Guo, Lanbin B. Wang, Mengben Gifford, Roger M.
Copyright Year	2007
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.
Starting Page	251
Ending Page	262
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	299
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fine roots Land use change Minirhizotron Native pasture Pinus radiate Plantation Soil carbon Soil nitrogen Themeda triandra Turnover Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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