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作 者 ：贾慧君 郑槐明 花晓梅 李江南 万细瑞

期 刊 ：林业科学 1997年 33卷 1期 页码：51-58

关键词：湿地松；Pt外生菌根；稳态营养；营养物相对添加速率；生长；

Keywords:Pinus elliottii, Pt ectomycorrhiza, Steady state mineral nutrition, Nutrient relative addition rate．Growth,

摘 要 ：在非控制条件下,按稳态矿质营养理论与技术,对接种与不接种Pt外生菌根菌剂的湿地松芽苗,分别以0%、5.3%、6.4%、7.5%营养物相对添加速率进行施肥处理(以下简称0、5.3、6.4、7.5处理)。通过观测苗木生长、根系和菌根发育、生物量积累、以及叶片营养元素和叶绿素含量,研究湿地松芽苗Pt外生菌根形成的外界营养水平及生长效应。结果表明,Pt接种苗平均株高、地径、株干重基本上随营养物添加速率提高而提高,其中7.5处理比0处理分别提高26.4%、52.5%、140.2%。而不接种苗各项最高值却出现在6.4处理,分别仅为21%、16.7%、54.1%,7.5处理生长受到抑制。说明Pt外生菌根能促进芽苗生长。7.5处理Pt接种苗中形成Pt外生菌根的占97%,Pt指数达95.1。同时,主根长度、一级侧根总长度均有增加,针叶N、P营养元素浓度和含量均有明显提高,单位N素利用率比不接种苗提高2.7倍。具体说明在本试验条件下,7.5处理对湿地松容器苗Pt苗根形成与发育较适宜,Pt菌根的形成又明显地促进了苗木对营养物质的吸收和利用,其单株施肥量为39.27mgN、19.64mgK、7.07mgP,N:K:P=1:0.5:0.18。

Abstract:The study aws carried out under noncontrolling conditions in FenyiCountry，Jiangxi Province(27°52′N，114°45′E，about 100m altitude)．During the growing season in 1994， Pt inoculated and noninoculated seedlings were fertilized with the 4 different relative addition rates．I.e.0％，5.3％，6.4％，7.5％，according to the theory of the steady state mineral nutrition．The results showed that there was a atatistic significant difference between inoculated and noninoculated seedlings in height growth，radial growth，and dry matter accumulation in the 7.5％treatment．The maximum values were found for inoculated seedlings in 7.5％treatment，which were 26.4％，52.5％，140.2％respectively higher than its control (0％)．While these were only 21％，16.7％，54.1％for noninoculated seedlings in 6.4％ treatment，which were inhibited in the 7.5％treatment．The seedlings inoculated with Pt in 7.5％treatment had formed Pt ectomycorrhizae amounting to 97％，Pt index up to 95.1，At the same time，the length of tqp root，the total length of first-class lateral roots，as well as N、P concentration and their contents in the needles of the seedlings in this treatment were higher than those in other treatments，N use efficiency of the inoculated seedling in 7.5％ treatment was 2.7 fold higher than that of the noninoculated seedlings in the same nutrient treatment，indicating that the 7.5％telative addition rate of mineral nutrients was suitable for ectomycorrhizae formation of container-grown slash pine seedling under this experimental conditions，which promoted the absorption and utilization of the mineral elements．The amount of fertilizer per seedling was about 39.27mg N，19.64mg K，and 707mg，P，N：K： P=1:0.5:0.18．

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