Abstract
Land change science has emerged as a fundamental component of global environmental change and sustainability research. Still, much remains to be learned before scientists can fully assess future roles of land-use/cover changes (LUCC) in the functioning of the Earth system and identifying conditions for sustainable land use. The objective of this paper is to gain a better understanding of the complex interactions of human and natural drivers underlying LUCC. We do so by developing and estimating a novel structural model of land use and using spatially explicit longitudinal observations from the Upper Yangtze basin of China. Our analysis focuses on the multiple dimensions of agriculture—not only cropland use itself, but also grain production, soil erosion, and related technical change—and our data cover 31 counties over four time periods from 1975 to 2000. Our results show that technical change plays an important role in supplying food on a limited cropland; limiting cropland expansion in turn reduces soil erosion, which then benefits grain production in the longer term. It is also found that policies and institutions have significant impacts on land use and the status of soil erosion. Together, these results carry some great implications to sustainable land use and ecosystem management.
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Notes
To be sure, intensive farming has its own environmental problems as well, such as soil salinity and toxicity due to improper chemical applications (Ruttan 2001).
Note that the cropland area at each time point, instead of cropland change between two points, is used to ensure that the data series are consistent for each equation.
Technical change and technical adoption are conceptually different, but they are used interchangeably in this paper.
Our prior knowledge of the study site indicated that elevation, ranging from 295 to 6,109 m for the study region with a mean of 3,070 m, is a more meaningful variable, compared to, for instance, slope or range. Because elevation does not change over time, though, it will not be listed in the table of summary statistics of variables below.
According to the government statistics, included in agriculture production value are the values of animal husbandry and forestry, as well as that of farming.
To make the land use data (in pixels) compatible with the socioeconomic and other data, the former need to be aggregated to the county level based on the administrative boundary maps.
Multiple cropping refers to the situation where the cultivated land is used more than once a year. It is, thus, measured with the ratio of the total sown area divided by the total cultivated area. As such, it enhances the land-use intensity.
Field visits indicate that plastic sheeting in high elevations can effectively raise soil temperature and maintain moisture, resulting in a greater probability of crop success and higher grain yield.
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Acknowledgments
This study was funded by the US National Science Foundation (Project 0507948). The authors are grateful for the comments and suggestions made by the reviewers and editors of this journal, as well as those by Ademola Braimoh, Jiaguo Qi, Larry Leefers, Karen Potter-Witter, and participants of the 2008 European Conference of Environmental and Resource Economics held in Gothenburg, Sweden. They also appreciate the assistance of Erin Shi and Victoria Hoelzer-Maddox.
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Edited by Mitsuru Osaki and Ademola Braimoh, Hokkaido University, Japan.
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Yin, R., Xiang, Q. An integrative approach to modeling land-use changes: multiple facets of agriculture in the Upper Yangtze basin. Sustain Sci 5, 9–18 (2010). https://doi.org/10.1007/s11625-009-0093-1
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DOI: https://doi.org/10.1007/s11625-009-0093-1