蓝云杉在不同立地条件下的生长性状与营养元素间的相关性

Growth Traits and Correlation with Nutrient Elements of Picea pungens

为探讨蓝云杉在甘肃省不同立地条件下的适应性,在5个生态区8个试验点布设测定林,调查和测定9 a生蓝云杉的生长和针叶营养元素指标,结合当地主要地理和气象因子,分析地理-气象因子、针叶营养元素和生长量之间的相关性。结果显示:8个试验点的蓝云杉的保存率、树高、新梢长、冠幅分别呈现极显著差异,在陇南山地、黄土高原丘陵沟壑、中部半干旱、祁连山区为蓝云杉适生区,河西走廊荒漠区为其一般适生区;蓝云杉的树高、新梢长和冠幅与不同试验点的纬度、年蒸发量存在极显著的负相关,与海拔存在显著的负相关,与年降水量存在极显著的正相关;8个试验点蓝云杉针叶的营养元素全磷、全氮、全碳、可溶性糖、可溶性淀粉含量都呈极显著差异(P<0.01);逐步回归分析表明,在5种营养元素中,对蓝云杉新梢生长影响较大的为全氮、全碳、可溶性糖含量等3种营养元素,其中全氮含量为正向效应,而全碳、可溶性糖含量为负向效应。

In order to investigate the adaptability of P.pungens under different site conditions in Gansu,study pilots were set up in 8 experiment sites in 5 ecological regions of Gansu.The growth indexes and coniferous nutrient element indexes of 9-year-old P.pungens were investigated and measured.Combining the major local geographic and meteorological factors,the correlation between geographic-meteorological factors,nutrient elements and growth of conifer were analyzed.The results showed that the preservation rate,tree height,new-shoot length,and crown width of P.pungens showed extremely significant differences in the 8 experiment sites.The suitable growth area of P.pungens was the Longnan Mountains,the Hills and Gully of the Loess Plateau,the semi-arid of the central part,and the Qilian Mountains.The just suitable for growth area was Hexi Corridor Desert Area.The result of correlation analysis shows that tree height,new-shoot length and crown width have extremely significant negative correlations with the latitude and annual evaporation of different experiment sites,and have significant negative correlation with altitude,and have significant positive correlation with annual precipitation.The nutrient elements contents of conifer that total phosphorus,total nitrogen,total carbon,soluble sugar,and soluble starch showed extremely significant differences in the 8 experiment sites(P<0.01).After the stepwise regression analysis,it was showed that the 3 of 5 nutrient elements,having a greater impact on the growth of Picea pungens new-shoots,are total nitrogen,total carbon,and soluble sugar content.The total nitrogen content has a positive effect on them,and the total carbon and soluble sugar content has a negative effect on them.