关键词: 地理加权回归, 江西省, 空间自相关, 水产养殖

Abstract: In order to understand the water resource types and aquaculture structure in Jiangxi Province, the area of water resource at county level was obtained with remote sensing images in 2012 and was divided into different water body types. The spatial heterogeneity and spatial variability of typical elements in relation to aquaculture in 89 counties were analyzed based on global and local spatial autocorrelation. Considering the phenomenon of spatial correlation and heterogeneity, we explored the influence of water resource area, aquaculture type, yield per unit and the number of professional fishery population on the production of aquaculture by using geographically weighted regression. The results showed that the water resource is dominated by large water body, accounting for 70% of the total area, followed by ponds and reservoirs, accounting for 21.26%, and small pond area accounted for about 9%. Obvious regional difference of water resource was observed that there was mainly large water bodies in the north region and mainly ponds and reservoirs in the south region. The production and area of aquaculture showed spatial clusters (P<0.01), but with different patterns. It was high-high distribution in Pengze County, Duchang County, Poyang County, Nanchang District, Nanchang County, Fengcheng City, Jinxian County and Yugan County, with significance at the level of 0.01 by Moran analysis, and the area and production in these areas accounted for 34.55% and 35.42%, respectively. According to the aquaculture species, the production of special aquaculture was mainly in Shangrao, Jiujiang, Nanchang and Yichun, whose production accounted for 69.84% of the special aquaculture production, however, the correlation between the proportion of special aquaculture production and water area was low. Turtle and frog industries dominated in the eastern mountain hilly land, therefore, the proportion of special aquaculture was high in Zixi, Nanfeng and Shicheng where there are less water resources. From the driving force of aquaculture, water area had the most important impact on aquaculture production (0.46 at the median level), followed by small pond area (0.36 at the median level), professional aquaculture population (0.26 at the median level), who all were positively correlated with aquaculture production. The impacts of water area and small pond area on aquaculture production declined from south to north, but the impact of professional aquaculture population on aquaculture production increased from south to north. The spatial heterogeneity of the influence degree may be related to aquaculture type and species structure. The influence of average yield per unit area was weak (-0.003 at the median level), and there was little difference among regions. The results of this study contribute to understanding the water resources distribution and aquaculture structure in Jianxi Province, and provide foundational data for the scientific layout of aquaculture.

Key words: aquaculture, geographically weighted regression, Jiangxi Province, spatial autocorrelation