Abstract: In order to explore the relationship between leaf nitrogen (N), phosphorus (P), potassium (K) contents and soil pH, organic matter, N, P, K contents of typical Chinese fir forest in Shimen National Forest Park of Guangzhou City, different ages and slope positions of Cunninghamia lanceolata forest were selected as the research object in the park. And the correlation between the nutrition of Chinese fir leaves and the content of corresponding nutrient elements in soil was also analyzed. The results showed that the order of N, P and K contents in different stand ages was N > K > P. The contents of N in near mature and mature forests were higher than those in middle aged forests, but K contents were lower in middle aged forests. There was no significant difference in phosphorus content among different forest ages. The N, P and K contents of Chinese fir leaves at different slope positions showed no regularity and no significant difference. The contents of N, P and K in Chinese fir leaves at the same slope position were consistent with the contents of N, P and K in soil at the corresponding slope position. The ratio of N:P of Chinese fir leaves increased with the increase of the forest age, while the N:K and P:K ratios increased first and then decreased with the increase of the forest age. There were significant differences in N:P ratio between middle-aged forests and mature forests, and significant differences in N:K and P:K ratios between middle-aged forests and near-mature forests. The N:P ratio of Chinese fir leaves at different stand ages and slope positions were all less than 14, and the growth of Chinese fir in the experimental area was limited by N but not by K. The results of correlation analysis showed that there was a significant positive correlation between total phosphorus and total nitrogen and potassium, negative correlation between soil pH value and nitrogen, phosphorus and potassium contents in Chinese fir leaves, positive correlation between soil organic matter and nitrogen, phosphorus and potassium contents in Chinese fir leaves, and positive correlation between soil nitrogen, phosphorus and potassium contents and corresponding elements content in Chinese fir leaves.

Key words: Chinese fir, leaf nutrient, soil nutrient, content, correlation

摘要： 为探讨广州市石门国家森林公园典型杉木林叶片氮(N)、磷(P)、钾(K)含量与土壤 pH、有机质、N、P、K含量间的关系，选取公园内不同林龄、坡位的杉木林为试材，分析林龄、坡位对杉木叶片营养元素含量的影响以及杉木叶片营养元素与土壤养分含量的相关性。结果表明，不同林龄杉叶N、P、K含量排序均为N＞K＞P，近熟林、成熟林中N含量高于中龄林，而K含量低于中龄林，P含量在不同林龄中无显著差异。不同坡位杉叶N、P、K含量排序未呈现规律性，也无显著差异，相同坡位杉叶N、P、K含量与相应坡位土壤N、P、钾含量呈现较高的一致性。不同林龄杉叶N:P随着林龄的增加而递增，N:K、P:K随着林龄增加先升后降；中龄林杉叶N:P与成熟林差异显著，中龄林杉叶N:K、P:K与近熟林差异显著；不同林龄及坡位杉木叶片的N:P均小于14，试验区杉木生长受N限制，未受K限制。相关分析结果显示：杉叶全P与其全N、全K呈显著正相关，土壤pH值与杉叶N、P、K均呈负相关，土壤有机质与杉叶N、P、K含量均为正相关，土壤N、P、K含量与杉叶中对应元素的含量均呈正相关。

关键词: 杉木, 叶片养分, 土壤养分, 含量, 相关性