Dynamic analysis of arable land use via productivity sustainable index — A case study of Farm 45 Irrigation Area of the Xinjiang Production and Construction Corps Parallel analysis of ecological footprint and regional ecological capacity: a case study for Xinjiang Effect of different fertilizer applications on sustainable soil fertility and rice production in red soil paddy ecosystem Sustainability of eco-agricultural patterns in hilly red soil areas Evaluation on the sustainability of cropland under different long-term fertilization in Eum-Orthic Anthrosols area Evaluation of crop rotation system sustainability in slope land under long-term chemical fertilization based on geometry method