Estimating Net Primary Production from Measurements Made on Soil Organic Matter
1999; Wiley; Volume: 80; Issue: 8 Linguagem: Inglês
10.2307/177256
ISSN1939-9170
AutoresD. S. Jenkinson, J. Meredith, J. I. Kinyamario, G. P. Warren, M. T. F. Wong, D. D. Harkness, R. Bol, K. Coleman,
Tópico(s)Botany and Plant Ecology Studies
ResumoEcologyVolume 80, Issue 8 p. 2762-2773 Article ESTIMATING NET PRIMARY PRODUCTION FROM MEASUREMENTS MADE ON SOIL ORGANIC MATTER D. S. Jenkinson, D. S. Jenkinson Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UK IARC Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UKSearch for more papers by this authorJ. Meredith, J. Meredith Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UKSearch for more papers by this authorJ. I. Kinyamario, J. I. Kinyamario Department of Botany, University of Nairobi, P.O. Box 30197, Nairobi, KenyaSearch for more papers by this authorG. P. Warren, G. P. Warren Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UKSearch for more papers by this authorM. T. F. Wong, M. T. F. Wong Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UK Present address:CSIRO Land and Water, Wembley, W.A. 6014, Australia.Search for more papers by this authorD. D. Harkness, D. D. Harkness NERC Radiocarbon Laboratory, East Kilbride, Glasgow G75 0QF, UKSearch for more papers by this authorR. Bol, R. Bol NERC Radiocarbon Laboratory, East Kilbride, Glasgow G75 0QF, UK Present address:IGER North Wyke, Devon, EX20 2SB, UK.Search for more papers by this authorK. Coleman, K. Coleman IARC Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UKSearch for more papers by this author D. S. Jenkinson, D. S. Jenkinson Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UK IARC Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UKSearch for more papers by this authorJ. Meredith, J. Meredith Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UKSearch for more papers by this authorJ. I. Kinyamario, J. I. Kinyamario Department of Botany, University of Nairobi, P.O. Box 30197, Nairobi, KenyaSearch for more papers by this authorG. P. Warren, G. P. Warren Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UKSearch for more papers by this authorM. T. F. Wong, M. T. F. Wong Department of Soil Science, University of Reading, P.O. Box 233, Reading RG6 6DW, UK Present address:CSIRO Land and Water, Wembley, W.A. 6014, Australia.Search for more papers by this authorD. D. Harkness, D. D. Harkness NERC Radiocarbon Laboratory, East Kilbride, Glasgow G75 0QF, UKSearch for more papers by this authorR. Bol, R. Bol NERC Radiocarbon Laboratory, East Kilbride, Glasgow G75 0QF, UK Present address:IGER North Wyke, Devon, EX20 2SB, UK.Search for more papers by this authorK. Coleman, K. Coleman IARC Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UKSearch for more papers by this author First published: 01 December 1999 https://doi.org/10.1890/0012-9658(1999)080[2762:ENPPFM]2.0.CO;2Citations: 53 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract A model for the turnover of organic matter in soil, ROTHC-26.3, can be used to calculate how much organic C needs to enter a soil annually in order to maintain a specified stock of soil organic C. The annual return of organic C thus calculated, plus the amount of organic C removed annually from the site by harvesting, burning, etc., provides an estimate of the Net Primary Production (NPP) of that site, averaged over many years. The new method was used to calculate NPP for two adjacent savanna sites in the Nairobi National Park in Kenya, one grazed and one not, and for a dry Miombo woodland site in Zambia. Both the Kenyan and Zambian sites are taken to be at equilibrium, with soil organic C levels at steady state. Soils from the three sites were analyzed by layer for organic C, δ14C, δ13C, soil microbial biomass C, total N, pH, and clay content. Radiocarbon measurements were >100% modern in the surface layers (0–15 cm) of the Kenyan soils (both Vertisols) and in all three layers (0–15, 15–30 and 30–50 cm) of the Zambian soil (an Oxisol), presumably because of 14C coming from the testing of thermonuclear bombs. The 15–30 cm layer of the Kenyan soils dated at ∼500 yr and the 30–50 cm layer at ∼900 yr. The 14C data were consistent with the presence of a small inert fraction of organic C that accounted for an increasing proportion of total organic C with increasing soil depth. The 13C data indicated that the Kenyan soils had developed under C4 vegetation, whereas the Zambian soils had developed under vegetation dominated by C3 plants. From these results the annual input of C to soil from the ungrazed Kenyan site was calculated to be 388 g C·m−2·yr−1, to the grazed site 380 g C·m−2·yr−1, and to the Zambian soil 373 g C·m−2·yr−1. Taking the loss of C from the Kenyan sites by burning to be 40 g C·m−2·yr−1, the mean NPP for both Kenyan sites is 424 g C·m−2·yr−1. This value for NPP is compatible with earlier estimates of NPP by botanical methods from the same site in Kenya. 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