摘要
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。
Nutrient diagnosis was applied into the E. urophylla and
slash pine stands and correlationvalues between the growth increment and the nutrient of both
the soil and the leaf were analyzed. This paper describes the test and presents the results as
following: 1. First, to the nonfertilized young E. urophylla stands, P is wanted. N should be
added only at the age of 1 and 6. At the age of 2, N must be carefully used and humic fertilizer
is the best choice. K is not wanted until aged 5 or 6. At the age of 2 and 6, Ca is required, Mg is
better used at aged 3. Generally, P is the most important fertilizer and then N and K. To the
fertilized stands, 100 kg/hm2 of N is the right volume to used, 50 kg/hm2 of P is a bit less
and 100 kg/hm2 is enough. K is needed only after 4 years old. To the E. urophylla stands, P is
the most efficient fertilizer. The second, nonfertilized slash pine stands normally have enough
of Mg and Ca, but K and P are wanted. Only while the soil is rich in P, N is useful. The impo
rtance order is P, K, N. Fertilizing 200 kg/hm2 of P efficiently promote the growth of 6 year old
stands. P can increase the stands' requirement of N. The correlation between the N requirement
and the volume of Ca, Mg and P is even higher while the later increase. Comparatively, the
efficiency of fertilizers is not high in slash pine. It comes to a conclusion that the nutrient
diagnosis results well corresponds with the efficiency of fertilizing. 2. The diagnosis results by
correlationvalue is fully meet the decline of the nutrient reserve of the field.;
出处
《广东林业科技》
1999年第3期15-21,共7页
Forestry Science and Technology of Guangdong Province
关键词
尾叶桉
湿地松
营养诊断
相关值法
施肥
Eucalyptus urophylla, slash pine, nutrient diagnosis, correlationvalue methods
