黑河中游耕地多功能性时空变化及权衡

Cropland provides a variety of functions, including not only food production, but also ecological maintenance, social security and landscape recreation.Multi-functional use of cropland has become an important land use practice to ensure human food security and social economic development.Using data from multiple sources such as basic geographical information data, socio-economic statistics data, remote sensing data, and points of interest data, this study constructed an evaluation index system to evaluate the production, ecological and living functions of cropland, and then examined the spatial and temporal changes in the tradeoffs and synergies of these three functions in the middle reaches of the Heihe River Basin.Finally, this study applied the clustering analysis to divide croplands into four functional zones, and for each zone the protection and management measures to enhance multi-functionality were proposed.The results showed that multi-functionality of cropland demonstrated highly spatial heterogeneity across the study area.The high-value areas were distributed in the central corridor plains while the low-value areas were in the transition zone from the southern Qilian Mountains to the corridor plains.The strong synergies between production function, ecological function and living function of the cropland dominated the study area, and were characterized by agglomerated distribution, while the trade-offs accounted for a very small proportion of croplands.According to the dominant function, we classified croplands of the study area into four zones, the central plain areas with dominant production function, the Qilian Mountainous areas for ecological security, the southern mountainous areas with disadvantageous cultivation conditions, and the northern desert areas with disadvantageous cultivation conditions.As regards each zone, we also proposed scientific measures for cropland protection and use.