白榆无性系叶片N、P、K含量及与材积生长的相关性

该文以 2 0个 1 0年生白榆无性系为材料 ,采用凯氏常量定氮法、钼蓝比色法和火焰光度法分别测定了叶片N、P、K的含量 ,并对叶片N、P、K含量的遗传变异规律及其与材积生长之间的相关性进行了研究分析 .结果表明 :N、P、K含量在 2 0个无性系间差异极显著 ,变异系数较高 ,重复力达 0 97以上 .N、P、K之间呈一定的正相关关系 ,与材积呈正相关 .材积与N的相关性达到极显著水平 ,与P的相关性达到显著水平 .建议将叶片N与P的含量作为白榆无性系早期选择的间接指标并对其可能机理进行进一步探讨

N,P,K content in the leaves of elm clones and its correlation with volume growth

Twenty white elm clones at ten years' age were studied on the content of N, P, K in their leaves by the Kjeldahl's method of nitrogen fixation, molybdenum blue spectrophoometry and flame spectrometry respectively.The genetic variation in the content of N, P, K and its correlation with volume growth were tested and analysed. The results show that the differences in the content of N, P, K among the tested clones are statistically significant at 0 01 level. Its variation coefficient is high and its repeatability is over 0 97. N, P and K are positively correlated with each other and all positively correlated with volume. The correlation between volume and N reached a highly significant level, and that between volume and P reached a significant level. It is suggested that the N, P content in their leaves should be used as the indirect characters for the early selection of elm clones and the possible mechanisms should be studied further.