By analyzing leaf nitrogen nutrient of the main fuel-forest trees of 14 species on the Loess Plateau, it was indicated that the nitrogen nutrient contents of the nitrogen-fixing trees were generally higher than ones of the non-nitrogen-fixing trees, and the mathematical test also showed that in a certain statistical level, the nitrogen nutrient difference was significant between two kinds mentioned above. Based on the above analysis and test, the utiligation of nitrogen-fixing fuel trees suitable for the Lo...
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