中国农产品贸易结构演化及对粮食安全的影响

王念, 程昌秀, 林耿

Evolving agricultural trade structure and its impact on food security in China

WANG Nian, CHENG Changxiu, LIN Geng

图1 农产品分级结果与颜色空间(a)和希尔伯特曲线(b)

Fig. 1 Classification of agricultural products and color space (a); Hilbert curve (b)