湿地松半同胞家系对轮伐中期追肥的生长响应

Growth response of Pinus elliottii open pollinated families to mid-rotation fertilization

【目的】分析轮伐中期施肥处理对湿地松Pinus elliottii半同胞家系生长的影响,比较磷肥与石灰的肥效差异。【方法】对13年生的湿地松半同胞子代测定林设置氮钾(对照)、氮钾+钙镁磷肥、氮钾+石灰3种施肥处理,分析了土壤和针叶的养分以及湿地松生长性状。【结果】轮伐中期施肥对株高、胸径及单株材积均有显著性影响,处理与家系的互作效应不显著。与对照相比,钙镁磷肥和石灰均促进了株高的生长,分别提高37.1%和29.5%;石灰可以促进材积增量,与对照相比,材积增量提高了22.5%,且石灰处理的胸径增长高于钙镁磷肥处理。【结论】轮伐中期可通过追施氮钾+石灰增加湿地松出材量;石灰对湿地松生长的促进可能与磷有关,与钙无关。

【Objective】To study the effect of mid-rotation fertilization on the growth of Pinus elliottii open pollinated families,and compare the differences of P fertilizer and liming.【Method 】Three different treatments（NK as control,NK ＋ Ca-Mg-P,NK ＋ liming） were conducted in a 13-year P.elliottii open pollinated progeny test stand.The growth characteristics of P.elliottii were examined before and after fertilization,and the nutrition contents were analyzed in soil and needle.【Result】Mid-rotation fertilization had a significant effect on the increments of height,DBH and volume,while the interaction effect between family and treatment was not significant.Compared to NK treatment,NK ＋ Ca-Mg-P and NK ＋liming significantly increased the height increment by 37.1% and 29.5% respectively,while the latter increased the volume increment by 22.5%.Meanwhile,the DBH increment of NK ＋ liming treatment was higher than that of NK ＋ Ca-Mg-P treatment.【Conclusion】Liming with NK fertilizers can increase the timber yield of P.elliottii.The promotive effect of liming on growth of P.elliottii might be related to P instead of Ca.