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对尾叶桉、湿地松林分进行相关值法营养诊断，结果表明：１．尾叶桉：不施肥的幼林需Ｐ肥，１，６龄林需Ｎ肥，２龄林要慎施Ｎ肥，应施有机肥；１～４龄林不必施Ｋ肥，至５，６龄林时要补充Ｋ肥；２，６龄林需Ｃａ肥，３龄林较需Ｍｇ肥。需肥顺序是Ｐ、Ｎ、Ｋ。施肥处理的以施Ｎ１００ｋｇ／ｈｍ２的适宜；施Ｐ量１００ｋｇ／ｈｍ２为足够，施５０ｋｇ／ｈｍ２的偏低；４龄林后需补充Ｋ肥。尾叶桉施Ｐ肥效果最为显著。２．湿地松：不施肥林地较需Ｐ、Ｋ肥，林地高Ｐ时需施Ｎ肥，Ｍｇ、Ｃａ养分足够。需肥顺序是Ｐ、Ｋ、Ｎ。施肥处理的以施Ｐ２００ｋｇ／ｈｍ２的更有利于促进湿地松６龄林后的生长成材。施Ｐ肥后，均能促进幼林对Ｎ的需求，并随着施钙镁磷肥量的增大，需Ｎ量和Ｃａ，Ｍｇ—Ｋ的拮抗交互作用也增大。湿地松施肥肥效不显著。３．林地土壤养分库存量下降的趋势及顺序与相关值诊断结果完全吻合。
The Eucalyptus urophylla and Pinus elliottii forests were diagnosed by correlation value method. The results showed that: 1. Eucalyptus urophylla: not fertilization of young Linlin need P fertilizer, 1,6-year-old need N fertilizer, 2-year-old forest to be applied N fertilizer, should be applied organic fertilizer; Forest to add K fertilizer; 2,6-year-old forest need Ca fertilizer, 3-year-old forest need Mg fertilizer. Fertilizer order is P, N, K. Fertilization to apply N100kg / hm2 appropriate; P amount of 100kg / hm2 is sufficient, Shi 50kg / hm2 low; 4 years after the need to add K fertilizer. Eucalyptus E is the most significant P fertilizer application. 2. Pinus elliottii: not fertilized forest more P, K fertilizer, high P fertilizer application of N fertilizer, Mg, Ca nutrient enough. Fertilizer order is P, K, N. Fertilization to Shi P200kg / hm2 is more conducive to promoting the growth of slash pine 6 years after the timber. After fertilization with P fertilizer, the demand of N in young forest could be promoted. With the increase of K, P, the antagonistic interaction between N and Ca, Mg-K also increased. Slash pine fertilization efficiency is not significant. 3. The tendency and order of decline of soil nutrient inventory in forest land exactly coincided with the diagnostic value of correlation value.