Abstract
Studies of net primary production in four contrasting tropical grasslands show that when full account is taken of losses of plant organs above- and below-ground these ecosystems are far more productive than earlier suggested. Previous values have mainly been provided by the International Biological Programme (IBP), where estimates of production were based on a change in vegetation mass alone and would not necessarily have taken full account of organ losses and turnover. Calculation at three of our sites based on estblished methodology using changes in plant mass alone (i.e. that used by the International Biological Programme, IBP) proved to be serious underestimates of when acount was taken of losses simultaneously with measurement of change in plant mass. Accounting for the turnover of material at these three sites resulted in productivities up to five times higher than were obtained using the standard IBP procedure. An emergent C4 grass stand at a fourth site in the Amazon achieved a productivity which approached the maximum recorded for agricultural crops. In this case, productivity values, when organ losses were taken into account, only slightly exceeded that obtained with IBP methods. The findings reported here have wider implications, in prediction of global carbon cycling, remote sensing of plant productivity and impact assessment of conversion to arable cropping systems.
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Beadle C L, Long S P, Imbamba S K, Hall D O and Olembo R J 1985 Photosynthesis in relation to plant production in terrestrial environments. UNEP/Tycooly, Oxford.
Bowen G D 1980 Misconceptions, concepts and approaches in rhizosphere biology.In Contemporary Microbial Ecology. Ed. D C Ellwood. pp 283–304. Academic Press, London.
Bourlière F and Hadley M 1970 The ecology of tropical savannas. Ann. Rev. Ecol. Syst. 1, 125–152.
Bradbury I K and Hofstra G 1976 Vegetation death and its importance in primary production measurements. Ecology 57, 209–211.
Buringh P 1980 Limits to the productive capacity of the biosphere.In Future Sources of Organic Raw Materials. Eds L E St. Piere and G R Brown. pp 325–383. Pergamon Press, Oxford.
Cooper J P (Ed.) 1975 Photosynthesis and Productivity in Different Environments. IBP Vol. 3. Cambridge University Press, Cambridge.
Coupland R T (Ed.) 1979 Grassland Ecosystems of the World. IBP Vol. 18. Cambridge University Press.
Hussey A and Long S P 1982 Seasonal changes in weight of above- and below-ground vegetation in a salt marsh at Colne Point, Essex. Journal of Ecology 70, 757–771.
Jackon D, Long S P and Mason C F 1986 Net primary production, decomposition and export ofSpartina anglica on a Suffolk Salt marsh. J. Ecology 74, 647–662.
Jordan C F (Ed.) 1981 Tropical Ecology. Hutchinson Ross, Stroudsberg.
Lieth H F H (Ed.) 1978 Patterns of Primary Productivity in the Biosphere. Hutchinson Ross, Stroudsberg.
Linthurst R and Reimold R J 1978 An evaluation of methods for estimating the net primary production of estuarine angiosperms. J. Appl. Ecol. 15, 919–932.
Long S P and Mason C F 1983 Saltmarsh ecology. Blackie, Glasgow.
Milner C and Hughes R E 1968 Primary Production of Grassland. IBP Handbook 6. Blackwell, Oxford.
Roberts M J, Long S P, Tieszen L L and Beadle C L 1985 Measurement of plant biomass and net primary production.In Techniques in Bioproductivity and Photosynthesis, 2nd edition. Eds. J Coombs, D O Hall, S P Long and J M O Scurlock. pp. 1–19. Pergamon Press, Oxford.
Singh J S and Joshi M C 1979 Tropical grasslands primary production.In Grassland Ecosystems of the World. Ed. R T Coupland. pp 197–218. Cambridge University Press, Cambridge.
Singh J S, Lauenroth W K and Sernhorst R K 1975 Review and assessment of various techniques for estimating net aerial primary production in grasslands from harvest data. Bot. Rev. 41, 181–232.
Singh J S, Singh K P and Yadava P S 1979 Tropical grasslands ecosystems synthesis.In Grassland Ecosystems of the World. Ed. R T Coupland. pp 231–240. Cambridge University Press, Cambridge.
Singh J S and Yadava P S 1974 Seasonal variation in composition, plant biomass and net primary productivity of a tropical grassland at Kurukshetra. India. Ecol. Monogr. 44, 351–376.
Singh J S, Lavenroth W K and Steinhurst R K 1975 Review and assessment of various techniques for estimating net aerial primary production in grasslands from harvest data. Bot. Rev. 41, 181–232.
Singh J S, Lavenroth W K, Hunt H W and Smith D M 1984 Bias and random errors in estimators of net root production: A simulation approach. Ecology 65, 1760–1764.
Tucker C J, Fung I Y, Keeling C D and Gammon R H 1986 Relationship between atmospheric CO2 variations and a satellite-derived vegetation index. Nature 319, 195–199.
Warrick R A 1986 Photosynthesis seen from above. Nature 319, 181.
Wiegert R G and Evans F C 1964 Primary production and the disappearance of dead vegetation on an oldfield in south eastern Michigan. Ecology 45, 49–62.
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Long, S.P., Garcia Moya, E., Imbamba, S.K. et al. Primary productivity of natural grass ecosystems of the tropics: A reappraisal. Plant Soil 115, 155–166 (1989). https://doi.org/10.1007/BF02202584
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DOI: https://doi.org/10.1007/BF02202584