林木营养诊断方法的研究

应用相关值法、ＤＲＩＳ法和临界值法，对丰产林主要用材树尾叶桉，湿地松进行营养诊断，春结果表明，相关值法能全面准确诊断出两树种在不同林龄的林木生长各养分的需求状况和需肥顺序，并与两种权种肥效应试验结果，及林地养分库存量下降变化的结果相符，更能反映林分的吸收生长和变化的规律性。

STUDY ON THE METHODS OF TREE NUTRIENT DIAGNOSIS

Correlation value, DRIS, threshold methods were applied to the nutrient diagnosis of Eucalyptus urophylla and slash pine plantations. The results shows that the correlation value method can be used in diagnosing the nutrient demand and importance order in the different ages of this two species. The results well correspond with the efficiency of fertilizing and fully met the decline of the nutrient reserve in the field as well. There is no influence from the site condition and the stand age. It is a simple and accurate, prompt method for tree nutrient diagnosis.;