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对原产地越南以及我国多个引种地的灰木莲的树高和胸径生长特征进行研究,分析了灰木莲生长对土壤养分和气候因子的响应.结果表明:不同种植地灰木莲的树高和胸径年均生长量差异显著.灰木莲胸径和树高的年均生长量与土壤全N、全P、速效N、速效P含量呈显著正相关,而与土壤有机质、全K、速效K含量相关性不显著,表明土壤N、P含量是影响灰木莲生长的主要养分因子.不同海拔灰木莲树高年均生长量差异显著,而胸径无显著差异.海拔为150~550 m,树高年均生长量随海拔升高而增大,在海拔550 m处达到最大,随后降低,表明海拔550 m为灰木莲引种的最适海拔.灰木莲树高和胸径的年均生长量与年均温、≥10℃积温呈显著负相关,与年降雨量呈显著正相关,表明年均温、≥10℃积温和降雨量是影响灰木莲生长的主要气候因子.
The tree height and DBH growth characteristics of the different provenances in Vietnam and other places in China were studied, and the responses of the growth of P. graminearum to soil nutrients and climatic factors were analyzed.The results showed that: Height and diameter at breast height.The results showed that there was a significant positive correlation between the average annual growth of DBH and tree height and total N, total P, available N and available P, but not with soil organic matter, total K, K content was not significant, indicating that soil N and P contents were the main nutrient factors affecting the growth of P. graminearum.However, , The average annual growth of tree height increased with altitude, reached its maximum at 550 m above sea level, then decreased, indicating that the elevation of 550 m was the most suitable altitude for the introduction of P. giganteum. There was a significant negative correlation between growth and annual average temperature, ≥10 ℃ accumulated temperature, and significant positive correlation with annual rainfall, indicating that annual average temperature, ≥10 ℃ accumulated temperature and rainfall are the main climatic factors that affect the growth of P. graminearum.