Spatiotemporal patterns and evolution characteristics of agricultural production function at county level in Beijing-Tianjin-Hebei Region

Guided by the target of "guaranteeing basic self-sufficiency of grain and other important food", quantitative research on agricultural production functions and their coupling characteristics from internal structure of agricultural products is the important subject that needs to be conducted in depth urgently at present. By building the evaluation indicator system of agricultural production function, and by utilizing the spatial measurement method, the spatial pattern and the evolution trend of agricultural production function including planting production function, forest and fruit production function, livestock production function and aquatic production function in Beijing-Tianjin-Hebei Region at county level during 2000-2013 are analyzed; then the model is applied to analyze the temporal-spatial correlation of planting production function and its coupling characteristics with other production functions, so as to provide reference for agricultural structure adjustment and layout optimization in the process of collaborative development in Beijing-Tianjin-Hebei Region. The research results indicate that: ① during 2000-2013, under comprehensive influence of resource endowment, location factor, infrastructures, policy inclination and other factors, the agricultural production functions at county level in Beijing-Tianjin-Hebei Region are regularly distributed, and the planting production function is stronger in the plain area; the counties around the municipal district possess stronger function of livestock production; the counties with stronger forest and fruit production function are mainly distributed in the low mountain and hill region; and the counties with stronger aquatic production function are distributed along the eastern coast. Compared with that in 2000, the agricultural production function at county level in Beijing-Tianjin-Hebei Region in 2013 is wholly promoted. However, there are large differences in promotion degree among different functions. ② From 2000 to 2013, the agglomeration effect of planting production function and livestock production function at county level is slightly weakened, the agglomeration effect of aquatic production function has stayed fairly constant, while that of forest and fruit production function is strengthened, and the homogeneous agglomeration characteristic of the comprehensive production function at county level is significant. ③ It is indicated from bivariate LISA map that there is obvious positive temporal-spatial correlation for planting production function during the research period, and the dualistic structure is significant; there is significant positive coupling between livestock production function and planting production function, forest and fruit production function, and the coupling degree is strengthened. It is suggested to reasonably adjust the agricultural production structure and optimize the layout at county level in combination with the current situation of agricultural production function and the coupling difference among functions, formulate the agricultural development strategy, and promote collaborative development of agricultural production functions in Beijing-Tianjin-Hebei Region.