灰木莲生长对土壤养分和气候因子的响应

Responses of Manglietia glauca growth to soil nutrients and climatic factors

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—550m，树高年均生长量随海拔升高而增大，在海拔550m处达到最大，随后降低，表明海拔550m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．

Tree height and diameter of breast height （DBH） as growth characteristics of Manglietia glauca introduced from Vietnam were measured at many sites in south China and responses of M. glauca growth to soil nutrients and climatic factors were analyzed in this study. Annual average in- crements of tree height and DBH among different planted sites had significant differences. Annual average increments of tree height and DBH had significant positive correlation with soil total N and P, available N and P, but no significant correlation with soil organic matter, total K, available K, indicating that soil N and P contents could be the main affecting factors for the growth of M. glau- ca. Annual average increment of tree height had significant difference, but annual average incre- ment of DBH had no significant difference at different altitudes. Annual average increment of tree height increased with the altitude from 150 to 550 m, the maximum was at the altitude of 550 m, and then it decreased. It indicated that the most appropriate altitude for M. glauca introduction is 550 m. Annual average increments of tree height and DBH had significant negative correlation with annual average temperature and ≥ 10 ℃ accumulated temperature, and significant positive correla- tion with annual average precipitation, suggesting that annual mean temperature, ≥ 10 ℃ accumu- lated temperature and annual average precipitation could be the main climatic factors influencing the growth of M. glauca.