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Measuring Neighborhood Impacts on Labor Out-Migration from Fanjingshan National Nature Reserve, China

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Abstract

Neighborhood impacts on decisions about out-migration, though less explored and understood than individual- and household-level impacts, can be significant; the integration of these impacts in decision-making analyses may reveal mechanisms undetectable otherwise. However, detecting these impacts can be difficult, especially when prior theorization is lacking. In this paper, we compare three methods of measuring and reducing neighborhood impacts: multilevel modeling, eigenvector spatial filtering (ESF) based on Euclidean distance, and ESF based on topological distance. The second ESF method, in particular, is developed to accommodate the elevation profile of our study site at the Fanjingshan National Nature Reserve of Guizhou Province, China. Our previous work identified a suite of socioeconomic factors at individual and household levels that influence out-migration decisions, to which we apply the aforementioned methods to identify and control for neighborhood impacts. While the non-spatial and multilevel models generated nearly identical results, the results from the ESF models present several considerable differences. The Moran's I statistics for each non-binary variable show that spatial autocorrelation is present in some variables. Among the spatially autocorrelated variables, there are different degrees of change in significance levels when compared to those in the non-spatial model. Although most changes detected are small, we identify an additional significant variable—in our case area farmed—that was not observed before we apply the ESF. Changes in the significance levels of several other independent variables are also more significant after we applied the topological distance definitions. Methodologically, the new results suggest using the topological ESF approach may allow other studies to take into account spatial autocorrelation, especially in more rural areas where elevation differences are significant.

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Notes

  1. We re-grouped the 58 sampled natural villages into 23 village clusters based on their geographic locations to ensure that each village cluster had at least 20 interviewed households for the Cox analysis. The village clusters consist of neighboring natural villages, not the official administrative villages.

  2. Out of the 3256 households living in the reserve, we conducted interviews with 605 scientifically randomly selected households (18.6% of total households). After determining the variables needed for the model, we were left with 513 sample households with complete data, which was still a fully statistically representative sample of the population. To check for possible bias in households excluded, we produced cross-tabulations to compare characteristics of the 513 included households with those of the 92 excluded ones, finding no major differences.

  3. An overall indicator for spatial autocorrelation based on how similar/dissimilar neighboring features are. It ranges from − 1 to 1, − 1 being perfectly dispersed, 1 perfectly clustered, and 0 perfectly random (Ord & Getis, 1995).

  4. Calculated from the number of variables in the model and the sum of squared errors (SSE). Smaller AIC scores indicate better fit (Burnham & Anderson, 2002).

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Acknowledgements

This research was funded mainly by the National Science Foundation under its Dynamics of Coupled Natural and Human Systems program [Grant DEB-1212183 and BCS-1826839]. We also received financial and research support from San Diego State University, and are grateful to the Carolina Population Center and its NIH/NICHD population center grant [P2C HD050924] for general support for Bilsborrow's collaboration. Finally, we thank Fanjingshan National Nature Reserve and the Research Center for Eco-Environmental Sciences at the Chinese Academy of Sciences for logistic support.

Funding

This research was funded by the National Science Foundation under the Dynamics of Coupled Natural and Human Systems program [Grant DEB-1212183 and BCS-1826839]. This research also received financial and research support from the Center for Complex Human-Environment Systems, San Diego State University. Finally, we are grateful to the Carolina Population Center and its NIH/NICHD population center grant [P2C HD050924] for general support to Bilsborrow for collaboration in this research.

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Contributions

All authors contributed to the study's conception and design. Material preparation and data collection were performed by SY, LA, RB, and ML, and undergraduates students from Tongren University. Analysis was performed by JD and YL. The first drafts were written by JD and YL. All authors commented on previous versions of the manuscript and approved the final manuscript.

Corresponding author

Correspondence to Yanjing Liu.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

Ethics Approval

Ethical approval for this study was obtained from the Institutional Review Board at San Diego State University (Protocol Number: 1732093).

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Informed consent was obtained from all individual and household participants in the study.

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The participants consented to the data being used for research, leading to this submission to the journal.

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Liu, Y., Dai, J., Yang, S. et al. Measuring Neighborhood Impacts on Labor Out-Migration from Fanjingshan National Nature Reserve, China. Spat Demogr 11, 7 (2023). https://doi.org/10.1007/s40980-023-00117-5

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