Abstract
Planted silvo-pastoral systems are formed by sparing selected native trees when land is cleared for pasture establishment, or by planting selected species – often known agroforestry species – into the establishing pasture. Isolated trees within pastures and savannas are often associated with `resource islands', characterized by higher fertility and organic matter levels under the tree canopies. We here examine the processes underlying the differences in fertility and organic matter in a buffel grass (Cenchrus ciliaris L.) pasture that contained two tree species (Ziziphus joazeiro Mart., Spondias tuberosa Arruda Cam.) preserved from the native thorn forest and a planted agroforestry species (Prospois juliflora Swartz D.C). The objective is to distinguish effects of soil variability from those induced by the presence of trees or the planting of pasture. The δ13C signatures of the original (largely C3) vegetation, the preserved and planted trees, and the planted C4 grass were used to distinguish the provenance of organic matter in the top soil (0–15 cm). This allowed the conclusion that all trees maintained C3 derived C at the original thorn forest level, while lower levels under pasture were due to mineralisation of organic matter. The net rates of forest-derived C loss under pasture varied with soil type amounting to between 25 and 50% in 13 years after pasture establishment. Only on Alfisol, C inputs from the pasture compensated for the C3-C losses. Analysis of organic and inorganic P fractions indicated Z. joazeiro and P. juliflora enriched the soil under their canopy with P, whereas S. tuberosa had no positive effect on fertility. A combination of ANOVA and spatial analysis and mapping was used to show vegetation effects.
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References
Araújo Filho J A 1990 Manipulacão da Vegetação Lenhosa da Caatinga para fins Pastoris. Sobral: EMBRAPA-CNPC. Circular Técnico 11. 18 pp.
Balesdent J, Mariotti A and Guillet B 1987 Natural carbon-13 abundance as a tracer for studies of soil organic matter dynamics Soil Biol Biochem 19, 25–30.
Baeth R O & Klemmedson J O 1986. Seasonal and annual changes in biomass nitrogen and carbon of Mesquite and Palo Verde ecosystems. J. Range Mgmt. 39, 108–112.
Belsky A J, Mwonga S M and Duxbury J M 1993 Effects of widely spaced trees and livestock grazing on understorey environments in tropical savannas Agroforestry Sys. 24, 1–20.
Buschbacher R, Uhl C and Serrao E A S 1988 Abandoned pastures in eastern Amazonas: II. Nutrient stocks in the soil and vegetation. J. Ecol. 76, 682–699.
Cadisch G and Giller K E 1996 Estimating the contribution of legumes to soil organic matter build up in mixed communities of C3/C4 plants. Soil Biol. Biochem. 28, 823–825.
Cerri C C, Volkhoff B and Andreaux F 1991 Nature and behavior of organic matter in soils under natural forest, and after deforestation burning and cultivation, near Manaus. For. Ecol. Manage. 38, 247–257.
Eiten G 1992 Natural Brazilian vegetation types and their causes. Anais da Academia Brasileira de Ciencias 64 (Suppl. 1), 35–65.
Farrel J 1990 The influence of trees in selected agroecosystems in Mexico. Agroecology Researching the Ecological Basis for Sustainable Agriculture, Ed. Gliessman S. R. pp 167–183.
Garcia-Miragaya J, Flores S and Chacon N 1994 Soil chemical properties under individual evergreen and deciduous trees in a protected Venezuelan savanna. Acta Oecologica 15, 477–484.
Garcia-Oliva F, Casar I, Morales P and Maass J M 1994 Forest-topasture conversion influences on soil organic carbon dynamics in a tropical deciduous forest. Oecologia 99, 392–396.
Garcia-Oliva F, Sanford R L Jr and Kelly E 1999 Effects of slash-and-burn management on soil aggregate organic C and N in a tropical deciduous forest. Geoderma 88, 1–12.
Gark V K 1992 Litter production and its nutrient concentration in some fuelwood trees grown on sodic soil. Biomass and Energy 3, 323–328.
Gark V K and Jam R K 1992 Influence of fuelwood trees on sodic soils. Can. J. For. Res. 22, 729–735.
Gregorich E G, Ellert B H and Monreal C M 1995 Turnover of soil organic matter and storage of corn residue carbon estimated from natural 13C abundance Can. J. Soil Sci. 75, 161–167.
Halvorson J J, Smith J L, Bolton H jr and Rossi R E 1995 Evaluating shrub-associated patterns of soil properties in a shrub-steppe ecosystem using multiple-variable geostatistics. Soil Sci. Soc Am. J. 59, 1476–1487.
Kellman M 1979 Soil enrichment by neotropical savanna trees. J. Ecol. 67, 565–577.
Lajtha K and Schlesinger W H 1988 The Biogeochemistry of Phosphorus cycling and Phosphorus availability along a desert soil chronosequence. Ecology 69, 24–39.
Letkeman L P. Tiessen H and Campbell C A 1996 Phosphorus transformation and redistribution during pedogenesis of Western Canadian soils. Geoderma 71, 201–218.
Machado I C S, Barros L M and Sampaio E V S B 1997 Phenology of caatinga species at Serra Talhada, PE, northeastern Brazil. Biotropica 29, 57–68.
Mariotti A 1991 Le carbonne 13 en abondance naturelle, traceur de la dynamique de la matière organique des sols et de l'évolution des paléoenvironnements continentaux. Cah. Orstom ser. Pedol. 16, 299–313.
Menezes R S C and Salcedo I H 1999 Influence of tree species on the herbaceous understory and soil chemical characteristics in a silvopastoral system in semi-arid Northeastern Brazil R. Bras. Ci. Solo 23, 817–826.
Mors W B 1994 A social function for the flora of the Cerrado and the Caatinga. Anais da Academia Brasileira de Ciências 66 (Suppl. 1), 85–89.
Noel D 1995 Ziziphus: jujube family species, distribution, exploitation. Yearbook West Australian Nut and Tree Crops Association 19, 14–20.
Reynolds J F, Virginia R A and Cornelius J M 1990 Resource island formation associated with desert shrubs, creosote bush (Larrea tridentata) and mesquite Prospois glandulosa) and its role in the stability of desert ecosystems: a simulation analysis. Bull. Ecol. Soc. Am. 70 (Suppl. 2), 299–200.
Rhoades C C 1995 Seasonal pattern of nitrogen mineralization and soil moisture Faidherbia albida (syn Acacia albida) in central Malawi. Agrofor. Syst. 29, 133–145.
Rhoades C C 1997 Single-tree influences on soil properties in agroforestry: lessons from natural forest and savanna ecosystems Agroforestry Syst. 35, 71–94
Sala O E, Golluscio R A, Lauenroth W K and Soriano A 1989 Resource partitioning between shrubs and grasses in the Patagonian steppe. Oecologia 81, 501–505.
Sampaio E V S B 1995 Overview of the Brazilian caatinga. In Seasonally Dry Tropical Forests. Eds. S H Bullock, H A Mooney and E Medina. pp 35–63. Cambridge University Press, Cambridge, UK.
Sanchez P 1995 Science in Agroforestry. Agroforestry Syst. 30, 5–55.
Shang C and Tiessen H 1997 Organic matter lability in a tropical Oxisol: evidence from shifting cultivation, chemical oxidation, particle size, density and magnetic fractionations Soil Sci. 162, 795–807.
Shang C and Tiessen H 1998 Stabilization of organic matter in semiarid tropical soils, size, density and magnetic separations Soil Sci. Soc. Am. J. 62, 1247–1257.
Shang C and Tiessen H 2001 Carbon Turnover and Carbon-13 Natural Abundance in Organo-mineral Fractions of a Tropical Dry Forest Soil Under Cultivation. Soil Sci. Soc. Am. J. 64, 2148–2155.
Silva V M, Araújo Filho J A, Leite E R, Pereira V L A and Ugiette S A 1995 Manipulação da caatinga e seu efeito sobre parámetros fitossociógicos e de produção, em Serra Talhada, Pernambuco In Reunião da Sociedade Brasileira de Zootecma, Anais 32, Brasilia, p 17–21.
Skjemstad J O, Catchpoole V C and Le Feuvre R P 1994 Carbon dynamics in Vertisols under several crops as assessed by natural abundance 13C Aust. J. Soil Res. 32, 311–321.
Tate K R and Salcedo I H 1988 Phosphorus control of soil organic matter accumulation and cycling. Biogeochemistry 5, 99–107.
Tiedemann A R and Kiemmedson J O 1973 Effect of mesquite on physical and chemical properties of the soil. J. Range Manag. 26, 27–29.
Tiessen H 1993 The study of phosphorus cycles in ecosystems. In Tropical Soil Biology and Fertility. Eds. J M Anderson and J S I Ingram. pp 179–188. A handbook of methods. Second edition CAB International, Wallingford, UK.
Tiessen H, Cuevas E and Chacon P 1994 The role of soil organic matter in sustaining soil fertility. Nature 371, 783–785.
Tiessen H and Moir J O 1993 Characterization of available phosphorus by sequential extraction. In Soil Sampling and Methods of Analysis. Ed.M R Carter. pp. 75–86. Canadian Society of Soil Science, Lewis Publishers.
Trumbore S E 1993 Comparison of carbon dynamics in tropical and temperate soils using radiocarbon measurements Global Biogeochem Cycles 7, 275–290.
Veldkamp E 1994 Organic carbon turnover in three tropical soils under pasture after deforestation. Soil Sci. Soc. Am. J. 58, 15–180.
Vitorello V A, Cerri C C, Andreux F G, Feller C and Victoria R 1989 Organic matter and natural carbon-13 distribution in forested and cultivated Oxisols. Soil Sci. Soc. Am. J. 53, 773–778.
Walbridge M R and Richardson C J 1991 Vertical distribution of biological and geochemical phosphorus subcycles in two southern Appalachian forest soils. Biogeochemistry 13: 61–85.
Weltzin J F and Coughenour M B 1990 Savanna tree influence on understorey vegetation and soil nutrients in northwestern Kenya J. Veg Sci. 1, 325–334.
West N E 1981 Nutrient cycling in desert ecosystems In Arid Land Ecosystems: Structure, Function and Management. Eds. Goodall D W and Perry R A. pp 301–324. Cambridge University Press.
Wick B, Tiessen H and Menezes R S C 2000 Land quality changes following the conversion of natural vegetation into silvo-pastoral systems in semiarid NE Brazil. Plant Soil 222, 59–70.
Young A 1997 Effects of trees on soils. In Agroforestry for Soil Management, 2nd edition, Ed A Young. pp 23–52 and pp 111–136. Cab International.
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Tiessen, H., Menezes, R., Salcedo, I. et al. Organic matter transformations and soil fertility in a treed pasture in semiarid NE Brazil. Plant and Soil 252, 195–205 (2003). https://doi.org/10.1023/A:1024762501920
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DOI: https://doi.org/10.1023/A:1024762501920