Abstract
Forest fragmentation in tropical ecosystems can alter nutrient cycling in diverse ways. We have analysed the effects of the forest-pasture edge on nutrient soil dynamics in a tropical deciduous forest (TDF) in Mexico. In two remnant forest fragments, both larger than 10 ha, litterfall, litter and soil samples associated to the tree Caesalpinia eriostachys were collected at five distances from the pasture edge into the inner forest (10 m in the pasture and 0–10, 30–40, 70–80 and 100–110 m towards the forest interior). We measured the concentrations of carbon (C), nitrogen (N) and phosphorus (P) in litterfall, surface litter and soil, and soil microbial C (Cmic) and microbial N (Nmic). Soil nutrient concentrations and Cmic and Nmic were lower in the pasture soils than in the forest soil samples. Total C and N pools, and Cmic and Nmic in the pasture were lower than in the forest. In contrast, net N immobilization and the increase in Nmic from rain to dry season increased from the edge to the inner forest. Soil P concentration was lower in the pasture and at the first distance class in the forest margin (0–10 m) than in the sites located further into the forest, while litter P concentration had the inverse pattern. Litterfall P was also reduced near the edge and increased towards the forest interior. As a consequence, litterfall C:P and N:P ratios decreased from the edge to the inner forest. These results suggest that the forest–pasture edge disrupts P dynamics within the first 10 m in the forest. Thus, plants' use of nutrients and productivity could be altered in the edge of fragmented forests.
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Acknowledgements
This research was financed by Consejo Nacional de Ciencia y Tecnologia, Mexico (Project No. G27674-N and Grant No. 128765 to T. T-A). The authors thank D.F.R.P. Burslem, K. Macmillan, J.M. Maass, C. Montaña and O. Briones and two anonymous reviewers for their helpful comments on the manuscript. We thank Salvador Araiza for his assistance in the field work; M. Nava-Mendoza and P. Islas in the laboratory analysis; H. Ferreira and Alberto Valencia for their assistance in processing data; the personnel of the Chamela Biological Station, UNAM, for their logistic assistance during the field work and Ramiro Peña for allowing us to use his pastures; and the Instituto de Ecología AC for use of the facilities during this project.
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Toledo-Aceves, T., García-Oliva, F. Effects of forest-pasture edge on C, N and P associated with Caesalpinia eriostachys, a dominant tree species in a tropical deciduous forest in Mexico. Ecol Res 23, 271–280 (2008). https://doi.org/10.1007/s11284-007-0373-0
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DOI: https://doi.org/10.1007/s11284-007-0373-0