杉木不同母株无性系针叶营养元素含量比较

Comparison of the Needle Nutrient Element Contents of Different Parent Clones in Chinese Fir

以广东省国营小坑林场采穗圃中20个萌条能力强的母株无性系为试材,对其叶中氮(N)、磷(P)、钾(K)、钙(Ca)、镁(Mg)营养元素含量进行测定分析。结果表明:针叶中均以N含量最高(平均15.70 g/kg)、Mg含量最低(平均1.10 g/kg),N和P及K含量间、Ca和Mg含量间均为显著或极显著正相关;各营养元素含量在无性系间差异极显著,变异系数达10.80%~25.97%,而各营养元素含量比值在无性系间也有所差异,其中K/Ca比变幅最大,N/P比变幅最小。运用主成分分析法对母株无性系营养元素吸收情况进行综合排序,前10名依次为c XK12、c XF03、c XK13、c XK14、c XF13、c XF01、c XK01、c XF06、T-c07、c XF14。

This study aimed to quantify needle nitrogen （N）, phosphorus （P）, potassium （K）, calcium （Ca） and magnesium （Mg） content of twenty stock plants in Chinese fir scion nursery. The obtained results indicated that N content （average 15.70 g/kg） ranked the first in needle elements, and Mg （average 1.10 g/kg） positioned the last in element content. Needle N, P and K content appeared to be positively correlated to each other at a significant level （P 〈 0.01 or 0.05）, and it was the same for Ca with Mg （P 〈 0.01）. Strikingly, each needle nutrient element content varied significantly among clones （P 〈 0.01） with a coefficient of variation ranging from 10.80 to 25.97%. The needle nutrient element content ratio also varied among clones as high for K/Ca and low for N/P. According to principal component analysis result, ten Chinese fir stock plant clones （cXK12, cXF03, cXK13, cXK14, cXF13, cXF01, cXK01, cXF06, T-c07, cXF14） were identified to have higher uptake ability on nutrient elements.