Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture/College of NaturalResources and Environment, Northwest A&F University, Yangling 712100, P.R.China;
Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Yangling 712100, P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture/College of NaturalResources and Environment, Northwest A&F University, Yangling 712100, P.R.China;
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture/College of NaturalResources and Environment, Northwest A&F University, Yangling 712100, P.R.China;
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture/College of NaturalResources and Environment, Northwest A&F University, Yangling 712100, P.R.China;
College of Geography Sciences, Shanxi Normal University, Linfen 041000, P.R.China;
Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Yangling 712100, P.R.China;
Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;