| The main purpose of this paper is to solve the problems of agricultural development, such as agricultural production potential, farmland ripening system, irrigation quota, and evaluation of the reclamation suitability of agricultural wasteland, by calculating light-temperature production potential, climate production potential, light-temperature potential’s water demand, irrigation water demand, and derived sustainable reclamation indexes. Based on the Miami model and GIS spatial analysis, the high precision global distribution field of the above indicators was calculated. The global light-temperature production potential was 226.0 billion tons of dry matter; the climate production potential was 125.3 billion tons of dry matter; and the total irrigation water demand was 12 441 cubic kilometers. The main conclusions were as follows: except for tropical rainforest areas, the high value regions of global climate productivity are highly consistent with the current agricultural areas, indicating that the climate potential of farmland was fully utilized by human beings; reclaiming suitable agricultural wasteland to develop rainfed agriculture in temperate regions generally required the local sustainable reclamation rate of film-mulched rainfed agriculture to be more than 2/3; the irrigation water requirement calculated according to Miami model can be used as an important basis for formulating the quota of sprinkler irrigation in farmland; and the sustainable reclamation rate of film-mulched drip irrigation is the highest among all kinds of reclamation rates, which can be used as the main index to guide the exploitation of wasteland resources suitable for agriculture and multi-cropping potential in agriculture. |