关键词: 保氮剂, 高温堆肥, 氮素损失, 水葫芦, 氨挥发

Abstract: The coordination between urbanization and environment is one of key issues for regional socio-economic development. We constructed an evaluation index system of urbanization and resources and environmental carrying capacity, and measured the spatiotemporal characteristics of urbanization, resources and environmental carrying capacity and coordination degree of Lanzhou-Xining urban agglomeration from 2005 to 2017 using the entropy method and coordination degree model. The results showed that the comprehensive index of urbanization shows a continuous upward trend, with the contribution of social urbanization being gradually increased and a “polarization” development model in space. There were significant differences in social urbanization between the two core cities (Lanzhou and Xining) and the surrounding counties. The comprehensive index of resources and environmental carrying capacity showed a fluctuating upward trend, of which the level of resources and environmental performance needs to be improved. Spatially, it was high in the east region and low in the west region, consistent with the topographic distribution. From the perspective of coordination types, the degree of coordination between urbanization and resources and environmental carrying capacity was between 0.4 and 0.5, which is on the verge of imbalance, with obvious spatial agglomeration characteristics. The coordinated areas were concentrated in the two provincial capitals (Lanzhou and Xining) and some surrounding counties, while the less coordinated areas were concentrated in the southern and western counties. Our results provide reference for the coordinated development of urbanization and resources and environmental carrying capacity in the Lanzhou-Xining urban agglomeration.

Key words: Eichhornia crassipes, nitrogen preserving agent, high temperature composting, ammonia volatilization, nitrogen loss.