滇东南喀斯特石漠化地区粮食增产的主导因素分析——以西畴县为例

根据西畴县近17年（1990 ~ 2006年）的耕地资源和社会经济统计数据，运用多元统计分析中的主成分分析方法来分析西畴石漠化地区影响粮食增产的主导因素。结果表明，耕地质量对粮食增产的贡献率是69.85%，经济投入水平对粮食增产的贡献率是20.29%，说明耕地质量因素是西畴石漠化地区粮食增产的主导因素，而耕地质量的提高则主要得益于西畴土地整理模式的实施。在西畴石漠化地区后备耕地资源极为缺乏，以及因为经济建设发展需要耕地减少难以避免的情况下，只有坚定不移地推进土地整理，切实加强土壤改良和农田基础设施建设，从根本上改良耕地和提高耕地质量，才能提高耕地产出水平，进而提高粮食产量。

The Leading Factors on Increasing Food Yield in Karst Rock-desertification Area of Southwest Yunnan Province: A case study in Xichou County

According to the statistics of farmland resources and social economy data of Xichou County in nearly 17 years (1990~2006), the paper has analyzed the leading factors on increasing food yield in rock-desertification area of Xichou County with principal component analysis method. The result indicates that the contribution ratio of farmland quality reached 69.85%, and that of economic investment was 20.29%, this shows that the farmland quality is the dominant factor leading to food increase, which mainly benefits from implementing of Land Consolidation Pattern in Xichou County. Because of the lack of reserved farmland resources and the trend of farmland decrease for the need of economic construction, only by constancy push on land consolidation, practically strengthen soil improvement, improve farmland infrastructure construction, the farmland quality can been heightened and food output will been increased.