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Nitrogen flows in"crop -edible mushroom"production systems in Hexi Corridor Oasis Irrigation Area Variations in the relationship between maximum leaf carboxylation rate and leaf nitrogen concentration QUANTITATIVE STUDY ON THE SOIL WATER DYNAMICS OF VARIOUS FOREST PLANTATIONS IN THE LOESS PLATEAU REGION IN NORTHWESTERN SHANXI LAND USE/COVER CHANGE EFFECTS ON CARBON CYCLING IN TERRESTRIAL ECOSYSTEMS