Emergy dynamic analysis of planting industry system in Gansu Province

To discuss the sustainable development of the planting industry in Gansu Province, the dynamic changes in energy input and output of the planting industry in the province from 2007 to 2017 were studied based on emergy theory. The results showed that both the total energy input and output of the planting industry in Gansu Province first increased and then decreased, with the energy input reaching a peak of 5.48 × 10²² sej in 2015 and the output reaching a peak of 2.55 × 10²² sej in 2014. Compared with the national planting industry, the annual mean values of net emergy yield ratio, emergy investment ratio, environmental load ratio, and emergy sustainable index of the planting industry system are lower in the Gansu Province, which are 0.71, 1.54, 1.50, and 0.48, respectively. It can be seen that the planting industry system in Gansu Province lacks vitality, has low development potential, and belongs to the unsustainable consumption economy system. Therefore, in the future development of Gansu province, we should improve the utilization rate of resources, reduce the input of non-renewable industrial auxiliary energy, pay attention to the protection of the ecological environment, and further promote the sustainable development of the planting industry.