资源与生态学报

居民膳食结构升级对耕地非粮化的影响

陈倩茹, 吴曼玉, 曾宏琛, 罗世龙

资源与生态学报, 2023, 14(6): 1350-1360. DOI: 10.5814/j.issn.1674-764x.2023.06.022

Variable	Implication	Mean	Std. Dev.
Non-grain production	Proportion of area sown with cash crops to total area sown with crops (%)	31.02	2.89
Energy	Dietary energy produced through human metabolism (kcal)	2046.854	218.138
Protein	Dietary protein produced through human metabolism (g)	57.3707	3.6079
Fat	Dietary fat produced through human metabolism (g)	35.736	7.8627
Dietary fibre	Dietary fibre produced through human metabolism (g)	6.6593	4.2396
Calcium	Dietary calcium produced through human metabolism (mg)	248.6817	16.5572
Carbohydrate	Dietary carbohydrate produced through human metabolism (g)	379.1593	65.6865

Table 2 Selection of variables and their meanings

本文的其它图/表

Table 1 Dietary nutrient content of various foods
Fig. 1 Changes in the non-grain production rate from 1992 to 2021
Fig. 2 Per capita food consumption structure of residents, 1992?2021
Fig. 3 Changes in per capita daily consumption of protein, fat, and energy among Chinese residents during 1992?2021
Fig. 4 Changes in per capita daily consumption of calcium, calbohydrate, and dietary fibre among Chinese residents during 1992?2021
Table 3 ADF unit root test
Table 4 Selecting the optimal lag order
Table 5 Johansen cointegration test results
Fig. 5 AR stationarity test
Fig. 6 Impulse responses of non-grain production to dietary nutrients
Note: In each graph, the horizontal coordinate is the number of lag periods, the vertical coordinate is the size of the response value, the solid line is the change trend of the response function, and the middle range of the dashed lines is the confidence interval. CI means confidence interval; IRF means impulse response function.
Table 6 Results of variance decomposition