不同立地条件楠木人工林养分研究

通过调查分析福建省顺昌县埔上国有林场不同立地条件、相同经营措施的37年生楠木人工纯林的养分状况,结果表明:楠木人工林生态系统中,除铜元素外,其他各养分元素的平均含量随林分立地质量的下降而减小,Ⅱ类地楠木人工林中生态系统各营养元素的平均含量比Ⅲ类地的高4%(镁)~66%(钾),比Ⅳ类地的高19%(铜)~121%(钙);营养元素的积累量随林分立地质量的下降而显著减小,Ⅱ类地上楠木人工林中大量养分元素的总积累量为1 723.940 kg.hm-2,分别是Ⅲ、Ⅳ类地的1.84倍和3.91倍,微量养分元素的总积累量为58 172.535 kg.hm-2,分别是Ⅲ、Ⅳ类地的2.12倍和3.6倍,楠木对土壤中养分元素的富集能力是不一样的。总的趋势为Mn>N>P>Zn>K>Cu。其中叶对各元素的富集能力较强,干材对各元素的富集能力较弱。

Study on nutrient elements of Phoebe bournei plantation in the different site conditions

Based on the study of the nutrition status of 37-year-old Phoebe bournei plantations with similar managements but in different sites in Pushang Forest Farm of Shunchang County,Fujian province,the results showed that in the ecosystem of Phoebe bournei plantation in different site conditions,except the content of copper element,the average content of other various nutrient element descended along with degrading of the site condition quality;in the site grade Ⅱ of Phoebe bournei plantation ecosystem,the average content of various nutrient elements was 4%(magnesium)～66%(potassium) higher compared with that of site grade Ⅲ,19%(copper)～121%(calcium) higher than that of site grade Ⅳ.Under the different site conditions,the accumulation capacity of nutrient elements had significant difference in Phoebe bournei plantation ecosystem,which descended along with degrading of the stand quality.In the site grade Ⅱ of Phoebe bournei plantation ecosystem,the total accumulation quantity of macronutrient elements was 1 723.940 kg·hm-2,1.84 times and 3.91 times compared with that of the site grade Ⅲ and Ⅳ,respectively.In the site grade Ⅱ of the Phoebe bournei plantation ecosystem,total accumulation quantity of microelement nutrients was 58 172.535 kg·hm-2,2.12 times and 3.6 times compared with that of the site grade Ⅲ and Ⅳ,respectively.The enrichment ability of Phoebe bournei for the different nutrient element was dissimilar.In general,the tendency is Mn>N>P>Zn>K>Cu.Leaf had strong the enrichment ability for the various elements,but stem weaker.