关键词: 杉木, 叶片养分, 土壤养分, 含量, 相关性

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