Abstract
The role of secondary vegetation in restoring soil fertility during shifting cultivation in the tropics is well known. Yet the effect of secondary succession on the spatial patterns of soil properties has received little attention. To determine whether changes in the plant community as a result of shifting cultivation affect the scale of spatial dependence for biologically important soil nutrients, we sampled three dry tropical forest stands in Campeche, Mexico. These stands represented a gradient of cultivation history: one mature forest stand, a forest fallow that had undergone one cultivation-fallow cycle, and a forest fallow that had undergone two cultivation-fallow cycles. We used an analysis of semivariance to quantify the scale and magnitude of spatial dependence for organic matter content (OM), phosphorus (P), potassium (K), and aluminum (Al) in each stand. The scale of spatial dependence varied with cultivation history, but the degree of spatial dependence did not differ among stands. In the mature forest P and K were autocorrelated over distances >7.5 m. In the forest fallows 48–88% of the variation in soil P and K was autocorrelated over distances up to 1.1–5.1 m. In contrast, the range of autocorrelation for Al (∼2.5 m) did not differ among stands. We conclude that shifting cultivation changes the range of autocorrelation for biologically important soil nutrients at a scale that may influence plant growth. The finer scaled pattern of soil nutrients in forest fallows is likely to persist with continued shifting cultivation, since fallows are cleared every 3–15 years.
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Acknowledgements
We would like to thank the farmers of El Refugio for use of their land and their assistance in the field; Howie Epstein for his comments on an earlier draft of this paper; colleagues at ECOSUR for their logistical support; and the California Rangeland and the California Archaeology Laboratories for use of their computing facilities. For their assistance collecting and processing samples we thank Lee Panich and Cristin O’Connor. This paper has also benefited from the comments of two anonymous reviewers. This research is a product of the Southern Yucatán Peninsular Region (SYPR) project involving Clark University, University of Virginia, El Colegio de la Frontera Sur, and Harvard University. Its principal sponsors have been NASA-LCLUC (Land Cover and Land Use Change) program (NAG5-6046 and NAG5-11134), Center for Integrated Studies of the Human Dimensions of Global Environmental Change, Carnegie Mellon University (NSF SBR 95-21914), and NSF-Biocomplexity (BCS-0410016). This research was also supported by a Terrence Daniels Family Jefferson Graduate Fellowship from the University of Virginia.
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Appendix
Appendix
Appendix 1. Lag interval, minimum and maximum number of pairs, and lag distance at which they occur for each variogram
Site | Lag interval (cm) | Minimum number of pairs | Maximum number of pairs | ||
---|---|---|---|---|---|
np | Lag distance (cm) | np | Lag distance (cm) | ||
Organic matter | |||||
Mature (0°) | 30 | 15 | 602 | 30 | 31 |
(90°) | 30 | 11 | 571 | 30 | 119 |
Mature (0°) | 30 | 10 | 359 | 23 | 239 |
(90°) | 30 | 14 | 600 | 35 | 88 |
One-fallow | 45 | 19 | 16 | 197 | 630 |
One-fallow | 30 | 56 | 30 | 111 | 600 |
Two-fallow | 26 | 46 | 27 | 99 | 493 |
Two-fallow | 34 | 10 | 12 | 151 | 645 |
Phosphorus | |||||
Mature | 50 | 37 | 49 | 92 | 650 |
Mature | 30 | 44 | 60 | 112 | 689 |
One-fallow (0°) | 40 | 11 | 15 | 77 | 519 |
(90°) | 40 | 23 | 159 | 58 | 720 |
One-fallow | 35 | 7 | 14 | 157 | 699 |
Two-fallow | 22 | 35 | 23 | 82 | 440 |
Two-fallow | 25 | 40 | 27 | 91 | 675 |
Potassium | |||||
Mature (0°) | 32 | 18 | 576 | 34 | 32 |
(90°) | 32 | 11 | 575 | 26 | 93 |
Mature | 28 | 43 | 56 | 94 | 531 |
One-fallow | 40 | 18 | 15 | 172 | 681 |
One-fallow | 50 | 24 | 19 | 220 | 699 |
Two-fallow | 40 | 12 | 14 | 169 | 720 |
Two-fallow | 25 | 9 | 12 | 138 | 649 |
Aluminum | |||||
Mature (0°) | 20 | 12 | 381 | 21 | 119 |
(90°) | 25 | 12 | 398 | 28 | 123 |
Mature | 40 | 22 | 15 | 127 | 400 |
One-fallow | 50 | 20 | 16 | 216 | 700 |
One-fallow | 35 | 7 | 14 | 157 | 699 |
Two-fallow (0°) | 45 | 10 | 17 | 46 | 89 |
(90°) | 45 | 11 | 16 | 49 | 90 |
Two-fallow | 38 | 7 | 11 | 131 | 646 |
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Diekmann, L.O., Lawrence, D. & Okin, G.S. Changes in the spatial variation of soil properties following shifting cultivation in a Mexican tropical dry forest. Biogeochemistry 84, 99–113 (2007). https://doi.org/10.1007/s10533-007-9107-1
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DOI: https://doi.org/10.1007/s10533-007-9107-1